【摘 要】
：
水稻生长于铵态氮为主的氮营养环境中，通常被认为是一典型的喜铵作物。通过对水稻根系中主导铵吸收的AMT的功能研究，发现吸收底物铵离子本身在体内的积累会对其吸收过程产生显著的反馈抑制作用，这一现象可能是限制现有高产条件下水稻高效吸收铵态氮的重要环节。打破这一反馈抑制作用的重要环节是通过增强铵同化的另一底物谷氨酸C的输入，推动同化反应的持续进行。在根系响应层面，通过高通量转录组测序发现水稻体内C代谢过程
【机 构】
：
土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008
【出 处】
：
江苏省植物生理学会2016年学术年会
论文部分内容阅读
水稻生长于铵态氮为主的氮营养环境中，通常被认为是一典型的喜铵作物。通过对水稻根系中主导铵吸收的AMT的功能研究，发现吸收底物铵离子本身在体内的积累会对其吸收过程产生显著的反馈抑制作用，这一现象可能是限制现有高产条件下水稻高效吸收铵态氮的重要环节。打破这一反馈抑制作用的重要环节是通过增强铵同化的另一底物谷氨酸C的输入，推动同化反应的持续进行。在根系响应层面，通过高通量转录组测序发现水稻体内C代谢过程的调整是响应根外供氮状况的关键。因此，进一步提高水稻的氮素吸收利用效率，可能需着眼于地上C—地下N的高效协同机制，即“以碳促氮”。
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