期刊
SCIENCE CHINA-LIFE SCIENCES
卷 53, 期 12, 页码 1369-1373出版社
SCIENCE PRESS
DOI: 10.1007/s11427-010-4097-y
关键词
maize; nitrogen use efficiency; root architecture; nitrate; rhizosphere
类别
资金
- National Basic Research Program of China [2009CB11860]
- National Natural Science Foundation of China [31071852, 30771289, 30821003]
- Special Fund for Agriculture Profession [200803030]
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.
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