The Experts below are selected from a list of 234 Experts worldwide ranked by ideXlab platform
Sarah M Eppley - One of the best experts on this subject based on the ideXlab platform.
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effects of sex and mycorrhizal fungi on gas exchange in the dioecious salt marsh grass Distichlis spicata
International Journal of Plant Sciences, 2015Co-Authors: Kassandra Reussschmidt, Todd N Rosenstiel, Sally R Rogers, Allie G Simpson, Sarah M EppleyAbstract:Premise of research. In dioecious plant species, males and females often differ in physiology, and mycorrhizal fungal relationships are likely to influence these differences. However, few data are available on the potential role of mycorrhizal fungi in altering sex-specific physiology and population sex ratios of dioecious plant species.Methodology. In this study, we measured leaf gas exchange in a multifactorial greenhouse experiment with and without mycorrhizal fungal additions and under field conditions in Distichlis spicata, a dioecious C4 salt marsh grass, displaying extreme spatial sex ratio variation.Pivotal results. We found a significant interaction between gas exchange, plant sex, and mycorrhizal fungal infection. Specifically, females but not males had significantly lower transpiration rates and higher water use efficiency (WUE) in treatments with increased mycorrhizal fungi. Additionally, field data showed similar WUE between plants at female-majority sites and male-majority sites, despite sig...
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Inter-sexual competition in a dioecious grass
Oecologia, 2010Co-Authors: Charlene A Mercer, Sarah M EppleyAbstract:Spatial segregation of the sexes (SSS) occurs in many dioecious angiosperms, but little data are available on the fitness advantages, if any, for males and females. We examined whether reciprocally transplanted male and female seedlings of Distichlis spicata , a dioecious grass species that exhibits extreme SSS, differed in their responses to microhabitats and competition treatments. Plants grown without conspecific competitors grew equally well in both male- or female-majority habitats, suggesting that male and female plants do not have differential resource needs at the juvenile life-history stage. However, plants subject to intra-sexual competition were significantly larger than plants subject to inter-sexual competition, suggesting that niche partitioning may occur in D. spicata .
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sex specific variation in the interaction between Distichlis spicata poaceae and mycorrhizal fungi
American Journal of Botany, 2009Co-Authors: Sarah M Eppley, Charlene A Mercer, Christian Haaning, Camille Brianne GravesAbstract:Associations between mycorrhizal fungi and plants can infl uence intraspecifi c competition and shape plant population structure. While variation in plant genotypes is known to affect mycorrhizal colonization in crop systems, little is known about how genotypes affect colonization in natural plant populations or how plant sex might infl uence colonization with mycorrhizal fungi in plant species with dimorphic sexual systems. In this study, we analyzed mycorrhizal colonization in males and females of the wetland dioecious grass Distichlis spicata , which has spatially segregated sexes. Our results suggest that D. spicata males and females interact with mycorrhizal fungi differently. We discuss the implications for the role of this sex-specifi c symbiotic interaction in the maintenance of the within-population sex ratio bias of D. spicata .
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new sequence tagged site molecular markers for identification of sex in Distichlis spicata
Molecular Ecology Resources, 2009Co-Authors: Sarah M Eppley, Robin Oquinn, Anna L BrownAbstract:Sex-linked molecular markers have become valuable tools for understanding sex ratio evolution and sex-specific physiology in pre-reproductive plants. To develop new accurate methods for sexing Distichlis spicata juveniles and nonflowering individuals, we converted a random amplified polymorphic DNA-polymerase chain reaction marker that co-segregated with the female phenotype into a set of sequence-tagged site markers. We tested the marker pair on known males and females from populations in Oregon and California. A single band was obtained for all female samples but never for males.
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microsatellite markers isolated from saltgrass Distichlis spicata
Molecular Ecology Notes, 2007Co-Authors: Olga V Tsyusko, Sarah M Eppley, Maureen B Peters, Tracey D Tuberville, Cris Hagen, Travis C GlennAbstract:Twelve polymorphic microsatellite DNA loci were isolated from saltgrass ( Distichlis spicata ) and optimized for future studies of its breeding system. The loci were screened for variability among 24 individuals from two populations. The primers amplified loci with numbers of alleles ranging from four to 14 per locus and polymorphic information content from 0.481 to 0.951. Observed heterozygosity varied from 0.227 to 0.958.
John L Gallagher - One of the best experts on this subject based on the ideXlab platform.
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exploiting wild population diversity and somaclonal variation in the salt marsh grass Distichlis spicata poaceae for marsh creation and restoration
American Journal of Botany, 2000Co-Authors: Denise M Seliskar, John L GallagherAbstract:The salt marsh grass Distichlis spicata was regenerated from tissue culture and propagated in a greenhouse. Selected regenerants, along with selections from six wild populations, were grown for two years in a common garden flood-irrigated thrice weekly with tidal creek water. Selected wild and regenerated plants were also planted in a created salt marsh. Significant differences among regenerant and wild population selections were found in several functionally important salt marsh plant characteristics, including potential detritus production, belowground organic matter production, canopy structure, and decomposition rate. A combination of characteristics not found in the wild populations was evident in a regenerated line that exhibited both a high detritus production potential and a high decomposition rate. The amount of variation that occurred among regenerants from one parental line via somaclonal variation was similar to that which occurred among the wild population selections. Results of this study suggest that tissue culture may provide a means of producing marsh grasses with specific characteristics for directing the functional development of newly created salt marshes.
Camille Brianne Graves - One of the best experts on this subject based on the ideXlab platform.
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sex specific variation in the interaction between Distichlis spicata poaceae and mycorrhizal fungi
American Journal of Botany, 2009Co-Authors: Sarah M Eppley, Charlene A Mercer, Christian Haaning, Camille Brianne GravesAbstract:Associations between mycorrhizal fungi and plants can infl uence intraspecifi c competition and shape plant population structure. While variation in plant genotypes is known to affect mycorrhizal colonization in crop systems, little is known about how genotypes affect colonization in natural plant populations or how plant sex might infl uence colonization with mycorrhizal fungi in plant species with dimorphic sexual systems. In this study, we analyzed mycorrhizal colonization in males and females of the wetland dioecious grass Distichlis spicata , which has spatially segregated sexes. Our results suggest that D. spicata males and females interact with mycorrhizal fungi differently. We discuss the implications for the role of this sex-specifi c symbiotic interaction in the maintenance of the within-population sex ratio bias of D. spicata .
Denise M Seliskar - One of the best experts on this subject based on the ideXlab platform.
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exploiting wild population diversity and somaclonal variation in the salt marsh grass Distichlis spicata poaceae for marsh creation and restoration
American Journal of Botany, 2000Co-Authors: Denise M Seliskar, John L GallagherAbstract:The salt marsh grass Distichlis spicata was regenerated from tissue culture and propagated in a greenhouse. Selected regenerants, along with selections from six wild populations, were grown for two years in a common garden flood-irrigated thrice weekly with tidal creek water. Selected wild and regenerated plants were also planted in a created salt marsh. Significant differences among regenerant and wild population selections were found in several functionally important salt marsh plant characteristics, including potential detritus production, belowground organic matter production, canopy structure, and decomposition rate. A combination of characteristics not found in the wild populations was evident in a regenerated line that exhibited both a high detritus production potential and a high decomposition rate. The amount of variation that occurred among regenerants from one parental line via somaclonal variation was similar to that which occurred among the wild population selections. Results of this study suggest that tissue culture may provide a means of producing marsh grasses with specific characteristics for directing the functional development of newly created salt marshes.
Charlene A Mercer - One of the best experts on this subject based on the ideXlab platform.
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Inter-sexual competition in a dioecious grass
Oecologia, 2010Co-Authors: Charlene A Mercer, Sarah M EppleyAbstract:Spatial segregation of the sexes (SSS) occurs in many dioecious angiosperms, but little data are available on the fitness advantages, if any, for males and females. We examined whether reciprocally transplanted male and female seedlings of Distichlis spicata , a dioecious grass species that exhibits extreme SSS, differed in their responses to microhabitats and competition treatments. Plants grown without conspecific competitors grew equally well in both male- or female-majority habitats, suggesting that male and female plants do not have differential resource needs at the juvenile life-history stage. However, plants subject to intra-sexual competition were significantly larger than plants subject to inter-sexual competition, suggesting that niche partitioning may occur in D. spicata .
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sex specific variation in the interaction between Distichlis spicata poaceae and mycorrhizal fungi
American Journal of Botany, 2009Co-Authors: Sarah M Eppley, Charlene A Mercer, Christian Haaning, Camille Brianne GravesAbstract:Associations between mycorrhizal fungi and plants can infl uence intraspecifi c competition and shape plant population structure. While variation in plant genotypes is known to affect mycorrhizal colonization in crop systems, little is known about how genotypes affect colonization in natural plant populations or how plant sex might infl uence colonization with mycorrhizal fungi in plant species with dimorphic sexual systems. In this study, we analyzed mycorrhizal colonization in males and females of the wetland dioecious grass Distichlis spicata , which has spatially segregated sexes. Our results suggest that D. spicata males and females interact with mycorrhizal fungi differently. We discuss the implications for the role of this sex-specifi c symbiotic interaction in the maintenance of the within-population sex ratio bias of D. spicata .