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Environmental conditions and genetic differentiation:what drives the divergence of coexisting Leymus chinensis ecotypes in a large-scale longitudinal gradient?

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Journal of Plant Ecology 2016年第5期9卷 616-628页

作者： Shan Yuan Chengyuan Guo Linna Ma Renzhong Wang State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing100093 China

Aims The two coexisting Leymus chinensis ecotypes exhibit remarkable divergences in adaptive strategies under drought and salinity in semi-humid meadows and semi-arid *** order to detect the major genetic and environmental factors dominating the intraspecific phenotype variations and ecotype formation,the questions regarding the two distinct phenotypic forms(ecotypes)in ***-ensis were addressed:(i)did environments drive the *** ecotype formation?(ii)was there a molecular basis for the morphological divergence between the two ecotypes?(iii)which driving force dominated the intraspecies divergence,divergent natural selection,genetic drift or stabilizing selection?Methods We applied a series experiments on demographical,morphological and physiological traits of two Leymus chinensis ecotypes with gray green(GG)and yellow green(YG)leaf color in nine wild sites along a longitudinal gradient from 114°to 124°E in northeast *** environmental data including mean annual precipitation,mean annual temperature,elevation and soil properties were *** compared the differences of morphological,physiological and genetic differentiations between the two *** FindingsThe GG type exhibited stronger fitness than YG type from the population densities,morphological traits(*** height,leaf area,leaf and seed weights et al.),leaf mass per area(LMA)and physiological traits[relative water content(RWC),proline,soluble sugar contents].Most of above phenotypes(*** shoot densities,spike length et al.)were significantly correlated with mean annual precipitation,mean annual temperature and soil water content(SWC),rarely a correlated with soil pH and soil *** populations showed convergence trend by their leaf chlorophyll contents and osmotic adjustments(proline and soluble sugar contents)in the greenhouse,but still exhibited their divergences between two ecotypes in the outdoor transplantation,suggesting that whether ***

关键词： genetic differentiation large-scale gradient microsatellites phenotypic traits Leymus chinensis ecotypes

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