植物学报 ›› 2020, Vol. 55 ›› Issue (5): 623-633.DOI: 10.11983/CBB20034

• 专题论坛 • 上一篇    下一篇

一氧化氮对豆科植物结瘤及固氮的影响机制

张卫勤1, 邹杭2,3, 张妮娜1, 林雪媛1, 陈娟1,2,*()   

  1. 1西北农林科技大学, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100
    2西北农林科技大学生命科学学院, 干旱地区作物胁迫生物学国家重点实验室, 杨凌 712100
    3陕西省农业与环境微生物重点实验室, 杨凌 712100
  • 收稿日期:2020-03-03 接受日期:2020-06-05 出版日期:2020-09-01 发布日期:2020-09-03
  • 通讯作者: 陈娟
  • 作者简介:E-mail: chenjuan@nwsuaf.edu.cn
  • 基金资助:
    国家自然科学基金(31501822)

Influence Mechanisms of Nitric Oxide on Nodulation and Nitrogen Fixation in Legumes

Weiqin Zhang1, Hang Zou2,3, Nina Zhang1, Xueyuan Lin1, Juan Chen1,2,*()   

  1. 1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
    2State Key Laboratory of Crop Stress Biology in Arid Areas, College of Life Sciences, Northwest A&F University, Yangling 712100, China
    3Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, Yangling 712100, China
  • Received:2020-03-03 Accepted:2020-06-05 Online:2020-09-01 Published:2020-09-03
  • Contact: Juan Chen

摘要:

豆科植物-根瘤菌共生过程受双方基因复杂且精细的调控, 能够产生特异的根瘤结构并可将大气中的惰性氮气(N2)转化为可被植物直接利用的氨态氮。结瘤与固氮受多种因素影响, 其中, 一氧化氮(NO)作为一种自由基反应性气体信号分子, 可参与调节植物的许多生长发育过程, 如植物的呼吸、光形态建成、种子萌发、组织和器官发育、衰老以及响应各种生物及非生物胁迫。在豆科植物中, NO不仅影响寄主与菌共生关系的建立, 还参与调控根瘤菌对氮气的固定并提高植株氮素营养利用效率。该文主要从豆科植物及共生菌内NO的产生、降解及其对结瘤、共生固氮的影响和对环境胁迫的响应, 阐述了NO调控豆科植物共生体系中根瘤形成和共生固氮过程的作用机制, 展望了NO信号分子在豆科植物共生固氮体系中的研究前景。

关键词: 一氧化氮(NO), 结瘤, 共生固氮, 血红蛋白(Hbs)

Abstract:

Legume-rhizobium symbiosis is genetically co-regulated by the genes of both partners. The symbiosis process involves the formation of special nodule structure where the inert nitrogen (N2) from the atmosphere is converted into ammonia nitrogen that can be directly used by plants. Nodulation and nitrogen fixation are affected by many factors. As a free radical reactive gas signaling molecule, nitric oxide (NO) participates in the regulation of many plant growth and development processes, such as respiration, photomorphogenesis, seed germination, tissue and organ development, aging, and response to various biotic and abiotic stresses. In the legumes, it has been found that NO not only affects the establishment of the symbiotic relationship between the host and the bacteria, but also is involved in regulating the fixation of nitrogen by the rhizobia and increases the efficiency of nitrogen nutrition utilization. Here we review the mechanism of NO regulating nodule formation and symbiotic nitrogen fixation in legume-rhizobium symbiosis system, including the production and degradation of NO in legumes and rhizobia and its effect on nodulation, symbiotic nitrogen fixation and their response to environmental stress. We discuss the prospects and challenges of studying NO signaling molecule in symbiotic nitrogen fixation system of legume-rhizobium.

Key words: nitric oxide (NO), nodule, symbiotic nitrogen fixation, hemoglobins (Hbs)