Ideotype root architecture for efficient nitrogen acquisition by maize in intensive cropping systems |
| |
Authors: | GuoHua Mi FanJun Chen QiuPing Wu NingWei Lai LiXing Yuan FuSuo Zhang |
| |
Institution: | Key Laboratory of Plant Nutrition, MOA, Beijing, 100193, China. |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 CNKI PubMed SpringerLink 等数据库收录! |
|