Intraspecific variation in precipitation responses of a widespread C_(4) grass depends on site water limitation
在一棵普遍 C <sub>4</sub> 草的降水回答的 Intraspecific 变化取决于地点水限制作者机构：Hawkesbury Institute for the EnvironmentWestern Sydney UniversityHawkesbury CampusLocked Bag 1797PenrithNew South Wales 2751Australia USDA-ARS Grassland Soil and Water Research Laboratory808 East Blackland RdTempleTX 76502USA Department of Integrative BiologyUniversity of Texas at Austin1 University StationAustinTX 78712USA Department of Plant BiologyMichigan State University612 Wilson RoadEast LansingMI 48824USA
出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)
年 卷 期：2017年第10卷第2期
页 面：310-321页
核心收录：
基 金：USDA is an equal opportunity provider and employer.D.B.L.acknowledges support from USDA-NIFA postdoctoral fellowship(2011-67012-30696) P.A.F.acknowledges support from USDA-NIFA(2010-65615-20632) Funding.the National Science Foundation Plant Genome Research Program(IOS-0922457)to T.E.J.,C.V.H.and P.A.F.Conflict of interest statement.None declared
主 题：climate change Panicum virgatum phenology phenotypic plasticity precipitation
摘 要：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
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