Wheat ear carbon assimilation and nitrogen remobilization contribute significantly to grain yield

查看全文 作　　者：Bangwei [1,2]Zhou;Maria Dolores [2]Serret;Abdelhalim [2]Elazab;Jordi Bort [2]Pie;José Luis [2]Araus;Iker [3]Aranjuelo;álvaro Sanz-[2,4]Sáez

机构地区：[1]Key Laboratory of Vegetation Ecology,Ministry of Education,Institute of Grassland Science,Northeast Normal University;[2]Unit of Plant Physiology,Faculty of Biology,University of Barcelona;[3]Agrobiotechnology Institute,Public University of Navarra-CSIC-Navarra Government,Arrosadia Campus;[4]Department of Plant Biology, University of the Basque Country, Pharmacy Faculty

出　　处：《Journal of Integrative Plant Biology》索引2016年第58卷第11期,共13页

基　　金：supported by Breeding to Optimise Chinese Agriculture (OPTICHINA) (Coordination and support action: FP7-KBBE-2010-4, 266045);the projects AGL 2011-30386C02-02 and AGL 2013-44147-R funded by the Spanish Ministry of Economy and Competitiveness;a Ramon y Cajal research grant funded by the Spanish Ministry of Economy and Competitiveness;a Basque Country Postdoctoral Fellowship funded by the Department of Culture and Linguistic Politics of the Basque Country Government 摘　　要：The role of wheat ears as a source of nitrogen(N)and carbon(C) in the grain filling process has barely been studied. To resolve this question, five wheat genotypes were labeled with15N-enriched nutrient solution. N remobilization and absorption were estimated via the nitrogen isotope composition of total organic matter and Rubisco. Gas exchange analyses showed that ear photosynthesis contributed substantially to grain filling in spite of the great loss of C due to respiration. Of the total kernel N, 64.7% was derived from the N acquired between sowing and anthesis, while the remaining35.3% was derived from the N acquired between anthesis and maturity. In addition, 1.87 times more N was remobilized to the developing kernel from the ear than from the flag leaf. The higher yielding genotypes showed an increased N remobilization to the kernel compared to the lower yielding genotypes. Inaddition, the higher yielding genotypes remobilized more N from the ears to the kernel than the lower yielding genotypes,while the lower yielding genotypes remobilized more N from the flag leaf to the kernel. Therefore, the ears contribute significantly toward fulfilling C and N demands during grain filling. 关键词：氮转运碳同化小麦穗小麦基因型籽粒灌浆过程产量光合作用同位素组成

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Wheat ear carbon assimilation and nitrogen remobilization contribute significantly to grain yield

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