The Experts below are selected from a list of 10365 Experts worldwide ranked by ideXlab platform
Jon Ågren - One of the best experts on this subject based on the ideXlab platform.
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evolution of the selfing syndrome anther orientation and herkogamy together determine reproductive assurance in a self compatible plant
Evolution, 2017Co-Authors: Per Torang, Linus Vikstrom, Jorg Wunder, Stefan Wotzel, George Coupland, Jon ÅgrenAbstract:Capacity for autonomous self-fertilization provides reproductive assurance, has evolved repeatedly in the plant kingdom, and typically involves several changes in Flower Morphology and development ...
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Phenotypic selection on floral traits in divergent populations of the moth-pollinated orchid Platanthera bifolia
2010Co-Authors: Elin Boberg, Jon ÅgrenAbstract:Among-population differences in Flower Morphology is commonly attributed to divergent natural selection mediated by pollinators, but comparisons of current selection in populations growing in contr ...
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stigma receptivity and effects of prior self pollination on seed set in tristylous lythrum salicaria lythraceae
American Journal of Botany, 2006Co-Authors: Anna R Waites, Jon ÅgrenAbstract:Stigma position is a key aspect of Flower Morphology that may influence pollination success and seed production. In the self-incompatible, tristylous herb, Lythrum salicaria, the stigma is position ...
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Genetic architecture of phenology, Flower Morphology and inflorescence size in two populations of the perennial herb Lythrum salicaria.
2004Co-Authors: Jon Ågren, Katarina OlssonAbstract:Genetic architecture of phenology, Flower Morphology and inflorescence size in two populations of the perennial herb Lythrum salicaria.
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Latitudinal population differentiation in phenology, life history and Flower Morphology in the perennial herb Lythrum salicaria
Journal of Evolutionary Biology, 2002Co-Authors: Katarina Olsson, Jon ÅgrenAbstract:In plants with a wide distribution, phenological characters can be expected to vary clinally along climatic gradients, whereas other characters important for adaptation to local biotic and abiotic factors may vary in a more mosaic fashion. We used common-garden experiments and controlled crosses to examine population differentiation in phenology, life history and Morphology in the perennial herb Lythrum salicaria along a latitudinal transect through Sweden (57°N to 66°N). Northern populations initiated growth and Flowering earlier, Flowered for a shorter period, were shorter, produced more and larger winter buds, and were older at first reproduction than southern populations. Flower Morphology varied significantly among populations, but was, with the exception of calyx length, not significantly related to latitude of origin. Survival in the common garden (at 63°49′N) was positively correlated with latitude of origin and the size and number of winter buds produced in the preceding year. The results suggest that the among-population differences in phenology and life history have evolved in response to latitudinal variation in length of the growing season. Further studies are required to determine whether population differentiation in Flower Morphology is maintained by selection.
Tia-lynn Ashman - One of the best experts on this subject based on the ideXlab platform.
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Flower Morphology and pollinator dynamics in Solanum carolinense (Solanaceae): implications for the evolution of andromonoecy
American journal of botany, 2008Co-Authors: Andrea Quesada-aguilar, Susan Kalisz, Tia-lynn AshmanAbstract:Flower Morphology and pollinator dynamics play an important role in the evolution and maintenance of many breeding systems, including andromonoecy. We used a series of field experiments to test the functional relationship between Flower Morphology and pollination dynamics (e.g., pollen receipt and export) in Solanum carolinense. We find that long-styled Flowers serve primarily as pollen recipients and short-styled Flowers as pollen donors, making this the first study to support the male-female interference hypothesis for the evolution of andromonoecy. However, this difference in the primary male or female function of the Flowers depends on the pollinator identity. In Flowers visited by Bombus impatiens, style length has a positive relationship with pollen deposition and a negative relationship with pollen removal. In contrast, neither morphological nor behavioral traits determine pollen deposition or removal by small halictid bees. We demonstrate that different pollinators could select for different floral morphologies, and thus, our research suggests that pollinator-specific interactions with Flower Morphology play an important role in the evolution and maintenance of anrdromonoecy.
Andrea Quesada-aguilar - One of the best experts on this subject based on the ideXlab platform.
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Flower Morphology and pollinator dynamics in Solanum carolinense (Solanaceae): implications for the evolution of andromonoecy
American journal of botany, 2008Co-Authors: Andrea Quesada-aguilar, Susan Kalisz, Tia-lynn AshmanAbstract:Flower Morphology and pollinator dynamics play an important role in the evolution and maintenance of many breeding systems, including andromonoecy. We used a series of field experiments to test the functional relationship between Flower Morphology and pollination dynamics (e.g., pollen receipt and export) in Solanum carolinense. We find that long-styled Flowers serve primarily as pollen recipients and short-styled Flowers as pollen donors, making this the first study to support the male-female interference hypothesis for the evolution of andromonoecy. However, this difference in the primary male or female function of the Flowers depends on the pollinator identity. In Flowers visited by Bombus impatiens, style length has a positive relationship with pollen deposition and a negative relationship with pollen removal. In contrast, neither morphological nor behavioral traits determine pollen deposition or removal by small halictid bees. We demonstrate that different pollinators could select for different floral morphologies, and thus, our research suggests that pollinator-specific interactions with Flower Morphology play an important role in the evolution and maintenance of anrdromonoecy.
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Flower Morphology, gender functionality, and pollinator dynamics in Solanum carolinense: implications for the evolution of andromonoecy
2007Co-Authors: Andrea Quesada-aguilarAbstract:Morphological differences in Flowers have important evolutionary consequences; they influence the plant's relationship with pollinators and are strongly correlated with sexual function in some breeding systems. Here, I explore the functional relationship between Flower Morphology and pollination dynamics (e.g. pollen receipt / export) in Solanum carolinense (Solanaceae) and evaluate whether this relationship varies with pollinator taxa. I also investigate if Flower Morphology determines fruit setting ability of Flowers under different pollination regimes. Solanum carolinense has been characterized as having an andromonoecious sexual system where individual plants bear both hermaphroditic and male Flowers. This species presents an ideal system to study the relationship between floral Morphology, functionality and pollinators because Flowers in natural populations vary in their style length and grow in diverse array of environments that vary in their pollinator fauna composition. I conducted a series of greenhouse experiments, pollinator observations and natural population surveys to test these relationships. My results demonstrate that long styled Flowers serve as pollen recipients and short styled Flowers as pollen donors. However, only bumblebees when (Bombus impatiens) are the pollinators I observe a positive relationship between style length and pollen deposition and a negative relationship with pollen removal. These findings support the female/male interference hypothesis and suggest that when plants are visited by species of species of Bombus, the differences in fitness could favor the evolution of andromonoecy. In contrast, when plants arevisited either by Augochloropsis metallica or Lassioglossum spp. there is no selection for the dimorphism (or any particular style length). I also found that Flower Morphology, in particular style length, determines the fruit setting ability of the Flowers in S. carolinense under different pollination regimes. However, in some Flowers sexual functionality varies and does not accord with traditional classification of the Flowers. The variation observed for style length, functionality and production of staminate Flowers among individuals in natural populations of S. carolinense could be due to variation in abundance and visitation rate of pollinator taxa. Future studies should not neglect taxa-specific plant-pollinator interactions because the evolution of plant breeding systems can be determined by taxa specific interactions.
Mark A. Hershkovitz - One of the best experts on this subject based on the ideXlab platform.
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Ancestral reconstruction of Flower Morphology and pollination systems in Schizanthus (Solanaceae)
American journal of botany, 2006Co-Authors: Fernanda Pérez, Mary T. K. Arroyo, Rodrigo Medel, Mark A. HershkovitzAbstract:Concerted changes in Flower Morphology and pollinators provide strong evidence on adaptive evolution. Schizanthus (Solanaceae) has zygomorphic Flowers and consists of 12 species of annual or biennial herbs that are distributed mainly in Chile and characterized by bee-, hummingbird-, and moth-pollination syndromes. To infer whether Flowers diversified in relation to pollinator shifts, we traced the evolutionary trajectory of Flower traits and visitors onto a phylogeny based on sequence data from ITS, waxy, and trnF/ndhJ DNA. Maximum-likelihood ancestral reconstruction of floral traits suggests that ancestral Schizanthus had a bee-pollination syndrome. The hummingbird syndrome evolved in S. grahamii, a high elevation species in the Andes. The moth syndrome evolved in the ancestor of three species that inhabit the Atacama Desert. Results of mapping Flower visitors onto the phylogeny show that the shift from bee to hummingbird pollination concurred with a shift in pollinators as predicted by the syndromes. However, the same pattern was not found for the moth syndrome. Visits by moths were observed only in one of the three moth-syndrome species, and at a very low rate. This mismatch suggests either anachronic floral characters or maintenance of rare, imperceptible moth pollination backed up by capacity for autonomous selfing. Overall, results suggest that diversification of Flower traits in Schizanthus has occurred in relation to pollinator shifts.
Fernanda Pérez - One of the best experts on this subject based on the ideXlab platform.
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Ancestral reconstruction of Flower Morphology and pollination systems in Schizanthus (Solanaceae)
American journal of botany, 2006Co-Authors: Fernanda Pérez, Mary T. K. Arroyo, Rodrigo Medel, Mark A. HershkovitzAbstract:Concerted changes in Flower Morphology and pollinators provide strong evidence on adaptive evolution. Schizanthus (Solanaceae) has zygomorphic Flowers and consists of 12 species of annual or biennial herbs that are distributed mainly in Chile and characterized by bee-, hummingbird-, and moth-pollination syndromes. To infer whether Flowers diversified in relation to pollinator shifts, we traced the evolutionary trajectory of Flower traits and visitors onto a phylogeny based on sequence data from ITS, waxy, and trnF/ndhJ DNA. Maximum-likelihood ancestral reconstruction of floral traits suggests that ancestral Schizanthus had a bee-pollination syndrome. The hummingbird syndrome evolved in S. grahamii, a high elevation species in the Andes. The moth syndrome evolved in the ancestor of three species that inhabit the Atacama Desert. Results of mapping Flower visitors onto the phylogeny show that the shift from bee to hummingbird pollination concurred with a shift in pollinators as predicted by the syndromes. However, the same pattern was not found for the moth syndrome. Visits by moths were observed only in one of the three moth-syndrome species, and at a very low rate. This mismatch suggests either anachronic floral characters or maintenance of rare, imperceptible moth pollination backed up by capacity for autonomous selfing. Overall, results suggest that diversification of Flower traits in Schizanthus has occurred in relation to pollinator shifts.