Ideotype root architecture for efficient nitrogen acquisition by maize in intensive cropping systems

查看全文 作　　者：MI GuoHua,CHEN FanJun,WU QiuPing,LAI NingWei,YUAN LiXing & ZHANG FuSuo* Key Laboratory of Plant Nutrition,MOA;Key Laboratory of Plant-Soil Interaction,MOE;College of Resources and Environmental Science,China Agricultural University,Beijing 100193,China

出　　处：《Science China(Life Sciences)》索引2010年第53卷第12期,共5页

基　　金：supported by the National Basic Research Program of China (Grant No. 2009CB11860);the National Natural Science Foundation of China (Grant Nos. 31071852,30771289,and 30821003);the Special Fund for Agriculture Profession (Grant No. 200803030) 摘　　要：The use of nitrogen(N) fertilizers has contributed to the production of a food supply sufficient for both animals and humans despite some negative environmental impact.Sustaining food production by increasing N use efficiency in intensive cropping systems has become a major concern for scientists,environmental groups,and agricultural policymakers worldwide.In high-yielding maize systems the major method of N loss is nitrate leaching.In this review paper,the characteristic of nitrate movement in the soil,N uptake by maize as well as the regulation of root growth by soil N availability are discussed.We suggest that an ideotype root architecture for efficient N acquisition in maize should include(i) deeper roots with high activity that are able to uptake nitrate before it moves downward into deep soil;(ii) vigorous lateral root growth under high N input conditions so as to increase spatial N availability in the soil;and(iii) strong response of lateral root growth to localized nitrogen supply so as to utilize unevenly distributed nitrate especially under limited N conditions. 关键词：MAIZE NITROGEN use efficiency root architecture NITRATE RHIZOSPHERE

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Ideotype root architecture for efficient nitrogen acquisition by maize in intensive cropping systems

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