摘要
根瘤菌是好氧型异养微生物,与豆科植物共生形成根瘤后可将N2转化为氨提供给植物,并消耗豆科植物光合作用产物。在豆科植物与根瘤菌共生过程中,根瘤菌侵染植物后在根瘤内分化为类菌体,类菌体将N2转化为不同类型的氨类物质提供给植物,与此同时,植物将光合作用的主要产物蔗糖转化为二羧酸盐(苹果酸盐为主)的碳源形式,为共生固氮及根瘤菌自身发育提供能源与动力。对豆科植物-根瘤菌共生系统中根瘤菌侵染过程、氮的转化与利用、氮碳代谢途径、氮碳互作关系进行综述,又对紫花苜蓿-根瘤菌共生系统中脂肪酸的合成、分解和利用以及脂肪酸能否作为氮代谢的能源进行了探讨,以期为苜蓿与根瘤菌共生系统间的能量信息传递提供理论依据,为提高共生系统固氮效率奠定坚实基础。
Rhizobia are aerobic heterotrophic microorganisms,which form nodules with leguminous plants and then convert N2 to ammonia and consume the photosynthetic products of leguminous plants.During the symbiosis between legumes and rhizobia,rhizobia can differentiate into bacteroids in the root nodule after infecting plants,and the bacteroids convert N2 into different types of ammonia substances to provide plants.At the same time,plant converts sucrose,the main product of photosynthesis,into carbon source form of dicarboxylate(mainly malic acid salts),providing energy and power for symbiotic nitrogen fixation and the development of rhizobia themselves.This paper reviewed the process of rhizobia infection,nitrogen transformation and utilization,nitrogen-carbon metabolic pathways,and nitrogen-carbon interactions in legume-rhizobia symbiotic systems.It is also explored synthesis,decomposition,and utilization of fatty acids in the alfalfa rhizobia symbiotic system,as well as whether fatty acids can be used as energy sources for nitrogen metabolism,in order to provide a theoretical basis for energy information transmission between the alfalfarhizobia symbiosis system,to lay a solid foundation for improving the nitrogen fixation efficiency of symbiotic systems.
作者
陆保福
康文娟
师尚礼
关键
南攀
马瑞宏
LU Baofu;KANG Wenjuan;SHI Shangli;GUAN Jian;NAN Pan;MA Ruihong(College of Prataculture,Gansu Agricultural University,Key Laboratory of Prataculture EcosystemEducation,Lanzhou 730070,China)
出处
《中国草地学报》
CSCD
北大核心
2023年第11期119-135,144,共18页
Chinese Journal of Grassland
基金
甘肃省高等学校创新基金项目“糖和脂肪酸对紫花苜蓿NCRs多样性和根瘤活性的影响”(编号2021A-062)
国家自然科学基金项目“苜蓿NCRs对根瘤菌表面多糖的合成调控及响应机制研究”(编号32101427)
国家牧草产业系统(CARS-34)资助。
关键词
豆科植物
根瘤菌
氮固定
氮分配
氮碳互作
脂肪酸
Leguminous plants
Rhizobium
Nitrogen fixation
Nitrogen distribution
Nitrogencarbon interaction
Fatty acids
