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Mark D Rausher - One of the best experts on this subject based on the ideXlab platform.
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The pigment-scent connection: do mutations in regulatory vs. structural anthocyanin genes differentially alter floral scent production in Ipomoea purpurea?
South African Journal of Botany, 2010Co-Authors: C.j. Majetic, Mark D Rausher, Robert A. RagusoAbstract:Many recent studies attempting to assess the biochemical connections between anthocyanin biosynthesis and floral scent production have yielded limited insights due in part to a focus on either field phenotypes of unknown genetic background or artificial genetic manipulation. In this study, we seek to more precisely explore the mechanistic connections between floral scent and color in Ipomoea purpurea by comparing inbred lines of wild-type purple flowered plants to lines of two naturally occurring color mutants: albino individuals created by a chalcone synthase (A locus) loss-of-function mutation and rayed individuals that result from a non-functional transcription factor (W locus). We found that I. purpurea floral scent is dominated by the two sesquiterpene hydrocarbons, (E)-β-caryophyllene and germacrene D, with small amounts of several other sesquiterpenoid compounds. These 15 carbon volatiles are derived from the mevalonic acid biosynthetic pathway, which has no structural precursor relationship with anthocyanin pigments. Thus, there is no direct pleiotropic relationship and, accordingly, we found no differences in overall scent production between purple-flowered and albino individuals. In contrast, rayed plants showed greater emission of several compounds when compared to their wild-type counterparts, suggesting that the specific mutant regulatory region in this phenotype could have an indirect effect on volatile production either through changes to overall metabolic flux or alteration of sesquiterpene synthase gene expression or enzyme activity. Future research should explore these possible roles for transcription factors across multiple biochemical pathways. There were no differences in floral scent composition or emission rate between the offspring of parents from the same line, suggesting that scent phenotype was conserved within each inbred line. However, there were differences in floral scent between inbred lines, suggesting that a number of genetic elements must contribute to overall scent production in this species. © 2010 SAAB. Published by Elsevier B.V. All rights reserved.
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selection through male function favors smaller floral display size in the common morning glory Ipomoea purpurea convolvulaceae
The American Naturalist, 2008Co-Authors: Jennifer A Lau, Richard E Miller, Mark D RausherAbstract:Abstract: In self‐compatible, hermaphroditic plants, display size—the number of flowers open on a plant at one time—is believed to be influenced by trade‐offs between increasing geitonogamous selfing and decreasing per‐flower pollen export as display size increases. Experimental results presented here indicate that selection through male function favors smaller display sizes in Ipomoea purpurea. In small arrays, plant display size was manipulated experimentally, and female selfing rate, male outcross success, and total male fitness were estimated using genetic markers and likelihood and regression analyses. As would be expected if larger displays experience greater geitonogamy, selfing rate increased with display size. However, the per‐flower amount of pollen exported to other plants decreased with display size. The magnitude of this effect is more than sufficient to offset the increase in selfing rate, resulting in reduced per‐flower total male fitness with increasing display size. The low values of inbr...
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PLEIOTROPIC EFFECTS OF AN ALLELE PRODUCING WHITE FLOWERS IN Ipomoea purpurea
Evolution; international journal of organic evolution, 2008Co-Authors: L. Caitlin Coberly, Mark D RausherAbstract:Although it is generally believed that pollinators are the primary selective agents driving flower-color evolution, it has recently been suggested that pleiotropic effects of mutations affecting flower color may serve as important constraints on floral evolution. We examined this hypothesis using white-flowered variants of the common morning glory, Ipomoea purpurea. Previous experiments indicate that the white-flowered a allele has a transmission advantage because of increased selfing and no detectable pollen discounting. We confirm this transmission advantage using a large field experiment in which both selfing rate and outcross success were measured for all three genotypes at the A locus. We also demonstrate that this transmission advantage is opposed by apparent pleiotropic effects in aa individuals manifested as reduced survival from germination to flowering. The magnitude of this effect, in combination with the known magnitude of inbreeding depression, more than compensates for the transmission advantage. Our results thus support the notion that deleterious pleiotropy may influence the evolutionary trajectory of flower-color mutants.
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Selection through male function favors smaller floral display size in the common morning glory Ipomoea purpurea (Convolvulaceae).
The American naturalist, 2008Co-Authors: Jennifer A Lau, Richard E Miller, Mark D RausherAbstract:In self-compatible, hermaphroditic plants, display size-the number of flowers open on a plant at one time-is believed to be influenced by trade-offs between increasing geitonogamous selfing and decreasing per-flower pollen export as display size increases. Experimental results presented here indicate that selection through male function favors smaller display sizes in Ipomoea purpurea. In small arrays, plant display size was manipulated experimentally, and female selfing rate, male outcross success, and total male fitness were estimated using genetic markers and likelihood and regression analyses. As would be expected if larger displays experience greater geitonogamy, selfing rate increased with display size. However, the per-flower amount of pollen exported to other plants decreased with display size. The magnitude of this effect is more than sufficient to offset the increase in selfing rate, resulting in reduced per-flower total male fitness with increasing display size. The low values of inbreeding depression previously reported for this species would enhance this effect.
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NATURAL SELECTION ON A POLYMORPHIC DISEASE‐RESISTANCE LOCUS IN Ipomoea purpurea
Evolution; international journal of organic evolution, 2007Co-Authors: Joel M. Kniskern, Mark D RausherAbstract:Although disease-resistance polymorphisms are common in natural plant populations, the mechanisms responsible for this variation are not well understood. Theoretical models predict that balancing selection can maintain polymorphism within a population if the fitness effects of a resistance allele vary from a net cost to a net benefit, depending upon the extent of pathogen damage. However, there have been a few attempts to determine how commonly this mechanism operates in natural plant–pathogen interactions. Ipomoea purpurea populations are often polymorphic for resistance and susceptibility alleles at a locus that influences resistance to the fungal pathogen, Coleosporium Ipomoeae. We measured the fitness effects of resistance over three consecutive years at natural and manipulated levels of damage to characterize the type of selection acting on this locus. Costs of resistance varied in magnitude from undetectable to 15.5%, whereas benefits of resistance sometimes equaled, but never exceeded, these costs. In the absence of net benefits of resistance at natural or elevated levels of disease, we conclude that selection within individual populations of I. purpurea probably does not account completely for maintenance of this polymorphism. Rather, the persistence of this polymorphism is probably best explained by a combination of variable selection and meta-population processes.
Regina S Baucom - One of the best experts on this subject based on the ideXlab platform.
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parallel and nonparallel genomic responses contribute to herbicide resistance in Ipomoea purpurea a common agricultural weed
PLOS Genetics, 2020Co-Authors: Megan L Van Etten, Shumei Chang, Regina S BaucomAbstract:The repeated evolution of herbicide resistance has been cited as an example of genetic parallelism, wherein separate species or genetic lineages utilize the same genetic solution in response to selection. However, most studies that investigate the genetic basis of herbicide resistance examine the potential for changes in the protein targeted by the herbicide rather than considering genome-wide changes. We used a population genomics screen and targeted exome re-sequencing to uncover the potential genetic basis of glyphosate resistance in the common morning glory, Ipomoea purpurea, and to determine if genetic parallelism underlies the repeated evolution of resistance across replicate resistant populations. We found no evidence for changes in 5‐enolpyruvylshikimate‐3‐phosphate synthase (EPSPS), glyphosate’s target protein, that were associated with resistance, and instead identified five genomic regions that showed evidence of selection. Within these regions, genes involved in herbicide detoxification—cytochrome P450s, ABC transporters, and glycosyltransferases—are enriched and exhibit signs of selective sweeps. One region under selection shows parallel changes across all assayed resistant populations whereas other regions exhibit signs of divergence. Thus, while it appears that the physiological mechanism of resistance in this species is likely the same among resistant populations, we find patterns of both similar and divergent selection across separate resistant populations at particular loci.
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the soil microbial community alters patterns of selection on flowering time and fitness related traits in Ipomoea purpurea
American Journal of Botany, 2020Co-Authors: Lindsay Chaney, Regina S Baucom, Regina S BaucomAbstract:PREMISE: Plant flowering time plays an important role in plant fitness and thus evolutionary processes. Soil microbial communities are diverse and have a large impact, both positive and negative, on the host plant. However, owing to few available studies, how the soil microbial community may influence the evolutionary response of plant populations is not well understood. Here we sought to uncover whether belowground microbial communities act as an agent of selection on flowering and growth traits in the common morning glory, Ipomoea purpurea. METHODS: We performed a controlled greenhouse experiment in which genetic lines of I. purpurea were planted into either sterilized soils or in soils that were sterilized and inoculated with the microbial community from original field soil. We could thus directly test the influence of alterations to the microbial community on plant growth, flowering, and fitness and assess patterns of selection in both soil microbial environments. RESULTS: A more complex soil microbial community resulted in larger plants that produced more flowers. Selection strongly favored earlier flowering when plants were grown in the complex microbial environment than compared to sterilized soil. We also uncovered a pattern of negative correlational selection on growth rate and flowering time, indicating that selection favored different combinations of growth and flowering traits in the simplified versus complex soil community. CONCLUSIONS: Together, these results suggest the soil microbial community is a selective agent on flowering time and ultimately that soil microbial community influences important plant evolutionary processes.
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the soil microbial community alters patterns of selection on flowering time and fitness related traits in Ipomoea purpurea
bioRxiv, 2019Co-Authors: Lindsay Chaney, Regina S Baucom, Regina S BaucomAbstract:ABSTRACT Premise of the study Plant flowering time plays an important role in plant fitness and thus evolutionary processes. Soil microbial communities are diverse and have a large impact, both positive and negative, on the host plant. However, owing to few available studies, how the soil microbial community may influence the evolutionary response of plant populations is not well understood. Here we sought to uncover if below-ground microbial communities act as an agent of selection on flowering and growth traits in the common morning glory, Ipomoea purpurea. Methods We performed a controlled greenhouse experiment in which genetic lines of I. purpurea were planted into either sterilized soils, or soils that were sterilized and re-inoculated with the microbial community from original field soil. This allowed us to directly test the influence of alterations to the microbial community on plant growth, flowering, and fitness, as well as assess patterns of selection in both soil microbial environments. Results We found that a more complex soil microbial community resulted in larger plants that produced more flowers. Selection strongly favored earlier flowering when plants were grown in the complex microbial environment than compared to sterilized soil. Additionally, we uncovered a pattern of negative correlational selection on growth rate and flowering time, indicating that selection favored different combinations of growth and flowering traits in the simplified versus complex soil community. Conclusions Together these results suggest the soil microbial community is a selective agent on flowering time and ultimately that soil microbial community influences important plant evolutionary processes.
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parallel and nonparallel genomic responses contribute to herbicide resistance in Ipomoea purpurea a common agricultural weed
bioRxiv, 2019Co-Authors: Megan L Van Etten, Shumei Chang, Regina S BaucomAbstract:The repeated evolution of herbicide resistance has been cited as an example of genetic parallelism, wherein separate species or genetic lineages utilize the same genetic solution in response to selection. However, most studies that investigate the genetic basis of herbicide resistance examine the potential for changes in the protein targeted by the herbicide rather than considering genome-wide changes. We used a population genomics screen and targeted exome re-sequencing to uncover the potential genetic basis of glyphosate resistance in the common morning glory, Ipomoea purpurea, and to determine if genetic parallelism underlies the repeated evolution of resistance across replicate resistant populations. We found no evidence for changes in 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), glyphosate9s target enzyme, that were associated with resistance, and instead identified five genomic regions that show evidence of selection. Within these regions, genes involved in herbicide detoxification--cytochrome P450s, ABC transporters, and glycosyltransferases--are enriched and exhibit signs of selective sweeps. One region in particular shows parallel changes across all assayed resistant populations whereas other regions exhibit signs of divergence. Thus, while it appears likely that the physiological mechanism of resistance in this species is likely the same among resistant populations, we find patterns of both similar and divergent selection across the separate resistant populations at particular loci.
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fitness costs of herbicide resistance across natural populations of the common morning glory Ipomoea purpurea
Evolution, 2016Co-Authors: Megan L Van Etten, Adam Kuester, Shumei Chang, Regina S BaucomAbstract:Although fitness costs associated with plant defensive traits are widely expected, they are not universally detected, calling into question their generality. Here, we examine the potential for life-history trade-offs associated with herbicide resistance by examining seed germination, root growth, and above-ground growth across 43 naturally occurring populations of Ipomoea purpurea that vary in their resistance to RoundUp®, the most commonly used herbicide worldwide. We find evidence for life-history trade-offs associated with all three traits; highly resistant populations had lower germination, shorter roots, and smaller above-ground size. A visual exploration of the data indicated that the type of trade-off may differ among populations. Our results demonstrate that costs of adaptation may be present at stages other than simply the production of progeny in this agricultural weed. Additionally, the cumulative effect of costs at multiple life cycle stages can result in severe consequences to fitness when adapting to novel environments.
Ernesto Gianoli - One of the best experts on this subject based on the ideXlab platform.
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Effect of water availability on tolerance of leaf damage in tall morning glory, Ipomoea purpurea
Acta Oecologica, 2009Co-Authors: Cristian Atala, Ernesto GianoliAbstract:Resource availability may limit plant tolerance of herbivory. To predict the effect of differential resource availability on plant tolerance, the limiting resource model (LRM) considers which resource limits plant fitness and which resource is mostly affected by herbivore damage. We tested the effect of experimental drought on tolerance of leaf damage in Ipomoea purpurea, which is naturally exposed to both leaf damage and summer drought. To seek mechanistic explanations, we also measured several morphological, allocation and gas exchange traits. In this case, LRM predicts that tolerance would be the same in both water treatments. Plants were assigned to a combination of two water treatments (control and low water) and two damage treatments (50% defoliation and undamaged). Plants showed tolerance of leaf damage, i.e., a similar number of fruits were produced by damaged and undamaged plants, only in control water. Whereas experimental drought affected all plant traits, leaf damage caused plants to show a greater leaf trichome density and reduced shoot biomass, but only in low water. It is suggested that the reduced fitness (number of fruits) of damaged plants in low water was mediated by the differential reduction of shoot biomass, because the number of fruits per shoot biomass was similar in damaged and undamaged plants. Alternative but less likely explanations include the opposing direction of functional responses to drought and defoliation, and resource costs of the damage-induced leaf trichome density. Our results somewhat challenge the LRM predictions, but further research including field experiments is needed to validate some of the preliminary conclusions drawn.
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DROUGHT LIMITS INDUCED TWINING BY LEAF DAMAGE IN THE CLIMBING PLANT Ipomoea purpurea (L.) ROTH (CONVOLVULACEAE)
Gayana. Botánica, 2009Co-Authors: Cristian Atala, Ernesto GianoliAbstract:El ambiente puede limitar la expresion de las respuestas inducidas por la herbivoria, como el aumento en las defensas quimicas o fisicas. Estudios recientes en plantas trepadoras muestran que el dano foliar induce el trepado. Esta respuesta podria conferir proteccion contra herbivoros en terreno. En este estudio investigamos el efecto de la sequia sobre la induccion de trepado en la trepadora anual Ipomoea purpurea (Convolvulaceae), planta que en condiciones naturales puede experimentar estres por sequia. En un experimento de invernadero, se registro la tasa de enredo (proporcion de plantas que se enredan exitosamente en un tiempo dado) de plantas danadas y no danadas de I purpurea, expuestas a tratamientos de riego control y sequia. Tambien se estimo la tasa de crecimiento y el contenido hidrico del tallo, justo despues de la evaluacion del trepado. Las plantas en el tratamiento de sequia mostraron una reduccion en la induccion de trepado por dano foliar comparado con plantas control. Ni la tasa de crecimiento ni el contenido hidrico se afectaron por el dano foliar o la sequia. Los resultados sugieren que la sequia limita la induccion de trepado por medio de mecanismos no directamente relacionados con el crecimiento y el contenido hidrico del tallo. Se sugiere que la sequia podria inducir senales que se contraponen con las generadas por el dano foliar. La induccion de trepado puede ser una ventaja en la presencia de herbivoros rastreros, pero la susceptibilidad ambiental de esta respuesta puede limitar su relevancia ecologica.
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Effect of support availability, mother plant genotype and maternal support environment on the twining vine Ipomoea purpurea
Plant Ecology, 2005Co-Authors: Ernesto Gianoli, Marcia González-teuberAbstract:In the twining vine Ipomoea purpurea we experimentally assessed the effect of support availability (a vertical stake), maternal genotype (family), and maternal environment (presence or absence of support in mother plants) on morphological traits, accounting for differences in initial seed size. While there was no effect of the maternal environment on seed size at the family level, families within each maternal environment did differ in seed size. Seeds from families of supported mothers showed higher germination than those from families of unsupported mothers. The maternal environment did not influence shoot traits but affected phenotypic plasticity in the number of leaves in response to support. Thus, whereas progeny plants from unsupported mothers did not show a response to support availability in the number of leaves, progeny from supported mother plants had a greater number of leaves once support was provided. The maternal genotype only affected the number of leaves.
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Phenotypic responses of the twining vine Ipomoea purpurea (Convolvulaceae) to physical support availability in sun and shade
Plant Ecology, 2003Co-Authors: Ernesto GianoliAbstract:Vines depend on external support to prevent shading by neighbouringplants. Hence, it is important to determine whether shading enhances thephenotypic responses of vines to support availability. I evaluated theconsequences of support availability (a vertical stake) on shoot and leaftraitsof the morning glory Ipomoea purpurea (Convolvulaceae)under full sunlight and extreme shade. It was hypothesised that phenotypicresponses of vines to support availability should be greater in the shade. Inaddition, to investigate possible constraints to such phenotypic responses, thecorrelations among phenotypic traits and the plasticity of such correlationswere evaluated. The phenotypic variation of the main stem length and of thenumber of branches was consistent with the hypothesis, i.e. greater responsestosupport availability in the shade. In contrast, both internode length and leafarea (two traits that showed a significant and positive correlation) decreasedin the sun and increased in the shade with support availability. Petiole lengthdecreased with support in the sun but had no response in the shade. On theotherhand, the number of significant trait correlations found in plants in the sunand supported plants was higher than those of shade and non-supported plants,respectively. Several of the correlations were significantly sensitive to theenvironment. Flowering only occurred in the sun treatment. Whereas no shoot orleaf trait was significantly correlated with flower number in supported plants,both petiole length and shoot biomass showed a significant correlation withsuchestimate of plant fitness in non-supported plants.
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Maternal environmental effects on the phenotypic responses of the twining vine Ipomoea purpurea to support availability
Oikos, 2002Co-Authors: Ernesto GianoliAbstract:The presence of physical support elicits a number of morphological changes in the shoot of the common morning glory Ipomoea purpurea, including a shortening of internodes and petioles and a thickening of the main stem. Working with experimentally supported and non-supported plants of I. purpurea, I tested the existence of maternal environmental effects of physical support in this twining vine. I evaluated whether the offspring of supported plants differed from the offspring of non-supported plants in a number of morphological and reproductive characters. Stem diameter was the only shoot trait that showed a significant effect of the maternal environment (support). The stems of the progeny of supported mother plants were thicker than the stems of the progeny of non-supported mother plants. This was true for both supported and non-supported progeny. Stem diameter, however, was not significantly related to plant fitness (seed number) in supported or non-supported progeny plants. The maternal environment did not affect the magnitude of the phenotypic responses to support of shoot traits in the progeny plants. There were no maternal environmental effects of physical support on the proportion of flowering plants at week 10 in both non-supported and supported progeny. Likewise, the presence of physical support in the maternal environment did not affect reproductive traits (seed number, seed size, percentage of reproductive biomass) in supported and non-supported progeny plants. Finally, the relationship between seed size and seed number was affected by the maternal support environment. The progeny of supported mother plants showed a significantly negative association (trade-off) between seed size and number, whereas such a trade-off was not observed in the progeny of non-supported plants. This was true for both supported and non-supported progeny.
Lindsay Chaney - One of the best experts on this subject based on the ideXlab platform.
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the soil microbial community alters patterns of selection on flowering time and fitness related traits in Ipomoea purpurea
American Journal of Botany, 2020Co-Authors: Lindsay Chaney, Regina S Baucom, Regina S BaucomAbstract:PREMISE: Plant flowering time plays an important role in plant fitness and thus evolutionary processes. Soil microbial communities are diverse and have a large impact, both positive and negative, on the host plant. However, owing to few available studies, how the soil microbial community may influence the evolutionary response of plant populations is not well understood. Here we sought to uncover whether belowground microbial communities act as an agent of selection on flowering and growth traits in the common morning glory, Ipomoea purpurea. METHODS: We performed a controlled greenhouse experiment in which genetic lines of I. purpurea were planted into either sterilized soils or in soils that were sterilized and inoculated with the microbial community from original field soil. We could thus directly test the influence of alterations to the microbial community on plant growth, flowering, and fitness and assess patterns of selection in both soil microbial environments. RESULTS: A more complex soil microbial community resulted in larger plants that produced more flowers. Selection strongly favored earlier flowering when plants were grown in the complex microbial environment than compared to sterilized soil. We also uncovered a pattern of negative correlational selection on growth rate and flowering time, indicating that selection favored different combinations of growth and flowering traits in the simplified versus complex soil community. CONCLUSIONS: Together, these results suggest the soil microbial community is a selective agent on flowering time and ultimately that soil microbial community influences important plant evolutionary processes.
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the soil microbial community alters patterns of selection on flowering time and fitness related traits in Ipomoea purpurea
bioRxiv, 2019Co-Authors: Lindsay Chaney, Regina S Baucom, Regina S BaucomAbstract:ABSTRACT Premise of the study Plant flowering time plays an important role in plant fitness and thus evolutionary processes. Soil microbial communities are diverse and have a large impact, both positive and negative, on the host plant. However, owing to few available studies, how the soil microbial community may influence the evolutionary response of plant populations is not well understood. Here we sought to uncover if below-ground microbial communities act as an agent of selection on flowering and growth traits in the common morning glory, Ipomoea purpurea. Methods We performed a controlled greenhouse experiment in which genetic lines of I. purpurea were planted into either sterilized soils, or soils that were sterilized and re-inoculated with the microbial community from original field soil. This allowed us to directly test the influence of alterations to the microbial community on plant growth, flowering, and fitness, as well as assess patterns of selection in both soil microbial environments. Results We found that a more complex soil microbial community resulted in larger plants that produced more flowers. Selection strongly favored earlier flowering when plants were grown in the complex microbial environment than compared to sterilized soil. Additionally, we uncovered a pattern of negative correlational selection on growth rate and flowering time, indicating that selection favored different combinations of growth and flowering traits in the simplified versus complex soil community. Conclusions Together these results suggest the soil microbial community is a selective agent on flowering time and ultimately that soil microbial community influences important plant evolutionary processes.
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The costs and benefits of tolerance to competition in Ipomoea purpurea, the common morning glory.
Evolution; international journal of organic evolution, 2014Co-Authors: Lindsay Chaney, Regina S BaucomAbstract:Tolerance to competition has been hypothesized to reduce the negative impact of plant-plant competition on fitness. Although competitive interactions are a strong selective force, an analysis of net selection on tolerance to competition is absent in the literature. Using 55 full/half-sibling families from 18 maternal lines in the crop weed Ipomoea purpurea, we measured fitness and putative tolerance traits when grown with and without competition in an agricultural field. We tested for the presence of genetic variation for tolerance to competition and determined if there were costs and benefits of this trait. We also assessed correlations between tolerance and potential tolerance traits. We uncovered a fitness benefit of tolerance in the presence of competition and a cost in its absence. We failed to detect evidence of additive genetic variation underlying tolerance, but did uncover the presence of a significant maternal-line effect for tolerance, which suggests its evolutionary trajectory is not easily predicted. The cost of tolerance is likely due to later initiation of flowering of tolerant individuals in the absence of competition, whereas relative growth rate was found to positively covary with tolerance in the presence of competition, and can thus be considered a tolerance trait.
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The evolutionary potential of Baker's weediness traits in the common morning glory, Ipomoea purpurea (Convolvulaceae)
American journal of botany, 2012Co-Authors: Lindsay Chaney, Regina S BaucomAbstract:PREMISE OF THE STUDY Many reports have cited Baker's list of weediness traits, or those that exemplify the "ideal" weed, yet few have considered the evolutionary potential of such traits as a group. Thus, it is unknown whether constraints on the evolution of increased weediness, such as a lack of genetic variation or genetic correlations between the traits, are present. Ipomoea purpurea, the common morning glory, is a problematic weed that exhibits many of Baker's ideal weed traits. METHODS We used progeny from a half/full-sib breeding design in a series of three greenhouse experiments to assess the presence of genetic variation, narrow sense heritabilities, and genetic correlations in Baker's growth, competition, and fitness "weediness" traits in two populations of I. purpurea. KEY RESULTS We uncovered genetic variation underlying reproductive fitness traits and competitive ability in at least one population, but no evidence of genetic variation underlying growth rate in either population. Genetic correlations between many of the weediness characters differed significantly from zero; however, their direction and/or magnitude differed between populations. CONCLUSIONS We found that increased weediness in the common morning glory is more likely to occur through selection on reproductive output and competitive ability rather than through selection on growth rate. Assessing Baker's traits in a quantitative genetics framework can provide a solid perspective on their evolutionary potential and a unique framework within which to determine how weeds will respond to different environmental stresses and/or scenarios of global climate change.
G. B. Lan - One of the best experts on this subject based on the ideXlab platform.
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First Report of Sweet potato leaf curl Georgia virus Infecting Tall Morning Glory (Ipomoea purpurea) in China
Plant disease, 2014Co-Authors: Songbai Zhang, Z. Wang, Y. F. Tang, X. M. She, G. B. LanAbstract:In September 2013, tall morning glory (Ipomoea purpurea) plants showing vein yellowing and leaf curl symptoms typical of a begomovirus infection were observed in Jingzhou, Hubei Province, China. Total nucleic acids were extracted from a symptomatic plant using cetyltrimethylammonium bromide (CTAB). Rolling circle amplification (RCA) was conducted using TempliPhi kit (GE Healthcare) to recover the genome of a putative begomovirus. Digestion of the RCA product with PstI yielded a ~2.8 kbp DNA fragment suggestive of a monomerized begomoviral genome. The fragment was cloned and sequenced and the sequence was deposited in GenBank under accession no. KF769447. SDTv1.0 (species demarcation tool) analysis revealed that the putative begomovirus showed 98.5 and 92.0% nucleotide sequence identity with Sweet potato leaf curl Georgia virus (SPLCGV)-[China:Hebei:2011] (GenBank Accession No. JX448368) and SPLCGV-[US:Geo:16] (AF326775), respectively. The virus contained six ORFs, which encoded proteins showing 96.5 to 10...
