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Intraspecific variation in precipitation responses of a widespread C_(4) grass depends on site water limitation

Journal of Plant Ecology 2017年第2期10卷 310-321页

作者： Michael J.Aspinwall Philip A.Fay Christine V.Hawkes David B.Lowry Albina Khasanova jason bonnette Briana K.Whitaker Nicholas Johnson Thomas E.Juenger Hawkesbury Institute for the Environment Western Sydney UniversityHawkesbury CampusLocked Bag 1797PenrithNew South Wales 2751Australia USDA-ARS Grassland Soil and Water Research Laboratory 808 East Blackland RdTempleTX 76502USA Department of Integrative Biology University of Texas at Austin1 University StationAustinTX 78712USA Department of Plant Biology Michigan State University612 Wilson RoadEast LansingMI 48824USA

Aims Variation in precipitation strongly influences plant growth,species distributions and genetic *** variation in pheno-typic plasticity,the ability of a genotype to alter its growth,morphol-ogy or physiology in response to the environment,could influence species responses to changing precipitation and climate *** this,the patterns and mechanisms of intraspecific varia-tion in plasticity to variable precipitation,and the degree to which genotype responses to precipitation are influenced by variation in edaphic conditions,remain poorly ***,we determined whether genotypes of a widespread C_(4) grass(Panicum virgatum L.,switchgrass)varied in aboveground productivity in response to changes in precipitation,and if site edaphic conditions modified genotype aboveground productivity responses to *** also determined if genotype productivity responses to precipitation are related to plasticity in underlying growth and phenological *** Nine *** genotypes originating from an aridity gradient were grown under four treatments spanning the 10th to the 90th percentiles of annual precipitation at two sites in central Texas:one site with deep,fine-textured soils and another site with shallow,coarse-textured *** measured volumetric soil water content(VWC),aboveground net primary productivity(ANPP),tiller pro-duction(tiller number),average tiller mass,canopy height,leaf area index(LAi)and flowering time on all plants at both sites and examined genotype responses to changes in *** Findings Across precipitation treatments,VWC was 39%lower and more variable at the site with shallow,coarse-textured soils compared to the site with deep,fine-textured *** averaged across genotypes and precipita-tion treatments was also 103%higher at the site with deep,fine-textured soils relative to the site with shallow,coarse-textured soils,indicating substantial differences in site water limitation.W

关键词： climate change Panicum virgatum phenology phenotypic plasticity precipitation

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