高氮抑制豆科植物结瘤固氮机制研究进展

doi:10.13560/j.cnki.biotech.bull.1985.2019-0657

摘要/Abstract

摘要：

豆科植物通过与根瘤菌共生,形成根瘤并进行生物固氮。豆科植物的结瘤固氮作用在农业上具有减肥增效、改良土壤等重大意义。然而,高氮会抑制豆科植物结瘤固氮,形成“氮阻遏”效应。着重论述了高氮抑制豆科植物结瘤的分子机制,包括氮素通过结瘤自调控AON（Autoregulation of nodulation）信号、NLP（NIN-like protein）转录因子、植物激素信号等途径抑制根瘤数目和发育的最新进展;并探讨了高氮抑制根瘤固氮活性的假说及争议,包括亚硝酸盐毒性和碳饥饿等,以期为提高豆科植物应对“氮阻遏”效应提供理论基础。

关键词: 硝酸盐, 豆科植物, 结瘤, 固氮, 抑制

Abstract:

Legumes form nodules and fix nitrogen by symbiosis with rhizobium. The nodulation and nitrogen fixation in legumes is of great significance in agriculture,such as reducing chemical fertilizer application,increasing farmers' benefit and improving soil environment. However,high nitrogen inhibits the nodulation and nitrogen fixation in legumes,forming a “nitrogen repression” effect. This paper discusses the molecular mechanism of high nitrogen inhibiting nodulation in legumes,including the recent progress in inhibiting the number of nodulations and development via pathways such as autoregulation of nodulation,NLP transcription factor and plant hormone signal,and explores te hypothesis and controversy on high nitrogen inhibiting the nodular nitrogenase activity,including nitrite toxicity and carbon starvation,aiming at providing theoretical basis for legumes to cope with nitrogen repression.

Key words: nitrate, legumes, nodulation, nitrogen fixation, inhibition

柯丹霞, 徐勤朕, 杨娜, 柏梦焱, 关跃峰. 高氮抑制豆科植物结瘤固氮机制研究进展[J]. 生物技术通报, 2019, 35(10): 40-45.

KE Dan-xia, XU Qin-zhen, YANG Na, BAI Meng-yan, GUAN Yue-feng. Research Progresses on the Mechanism of High Nitrogen Inhibiting Nodulation and Nitrogen Fixation in Legumes[J]. Biotechnology Bulletin, 2019, 35(10): 40-45.

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