Phenotypic plasticity in rice:responses to fertilization and inoculation with arbuscular mycorrhizal fungi  

作　　者：Shujuan Zhang Li Wang Fang Ma Jixian Yang Owen K.Atkin 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment,School of Municipal and Environmental Engineering,Harbin Institute of Technology,73 Huanghe Road,Nangang District,Harbin 150090,China [2]ARC Centre of Excellence in Plant Energy Biology,Division of Plant Sciences,Research School of Biology,The Australian National University,Building 134,Sullivans Creek Road,Canberra,Australian Capital Territory 2601,Australia

出　　处：《Journal of Plant Ecology》2016年第1期107-116,共10页植物生态学报（英文版）

基　　金：National Natural Science Foundation of China(51179041);Major Science and Technology Program for Water Pollution Control and Treatment(2012ZX07201003);Natural Science Foundation of Hei Longjiang Province,China(E201206);State Key Lab of Urban Water Resource and Environment(Harbin Institute of Technology)(2014TS05);ARC Centre of Excellence in Plant Energy Biology(CE140100008 to O.K.A.);ARC Linkage grant(LP0990330 to O.K.A.).

摘　　要：Aims Changes in the phenotype of crops(phenotypic plasticity)are known to play an important role in determining responses to nutrient availability,with the direction and magnitude of plasticity of individual traits being crucial for grain yields.Our study analysed the direction,magnitude and hierarchy of plastic responses of yieldrelated traits(i.e.biomass allocation and yield components)of rice(Oryza sativa L.)to nutrient availability.We estimated the effect of inoculation with arbuscular mycorrhizal fungi(AMF)on these characteristics of phenotypic plasticity.Methods A field experiment was carried out in northeast China,providing rice with six NPK fertilizer levels with or without inoculation with Glomus mosseae.At maturity,we quantified biomass allocation traits(shoot:root ratio and panicle:shoot ratio)and yield component traits(panicle number per hill,spikelet number per panicle,percentage of filled spikelets and seed weight).We also assessed the direction of change in each trait and the magnitude of trait plasticity.Important Findings In non-inoculated plants,we found that biomass allocation and seed-number traits(i.e.panicle number per hill,spikelet number per panicle and percentage of filled spikelets)responded to fertilization in the same direction,increasing with rising fertilization.Panicle formation was the most plastic trait,while seed mass was the least plastic trait.AMF inoculation nullified the relationship between most biomass allocation and seed-number traits(except for that between panicle:shoot ratio and the percentage of filled spikelets)but increased the magnitude of plasticity in biomass allocation traits without altering the hierarchy of traits’plasticity.These results underscore the importance of plasticity of yield-related traits per se,and the impact of AMF on plasticity,for maintaining rice yields under low fertilization regimes.

关 键 词：FERTILIZATION plastic response RICE nutrient availability SYMBIOSIS 

分 类 号：S51[农业科学—作物学]