Determinants of Host Range Specificity in Legume-Rhizobia Symbiosis.
Determinants of Host Range Specificity in Legume-Rhizobia Symbiosis.
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DOI：
10.3389/fmicb.2020.585749
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发表时间：
2020
影响因子：
5.2
通讯作者：
Gifford ML
中科院分区：
文献类型：
--
作者：
Walker L;Lagunas B;Gifford ML
豆科植物具有与土壤中的固氮细菌（称为根瘤菌）共生的几乎独特的能力。在这种共生过程中，细菌在寄主植物根部的称为根瘤的特殊器官上进行物理定殖，在那里它们将大气中的氮还原成可以被寄主植物同化并接收光合产物的形式。为了发生结核发育，在共生的形成阶段双方之间存在广泛的化学相互作用。绝大多数豆科植物能够形成根瘤，并且通常根瘤菌只能在这种共生关联的背景下固氮。然而，许多豆科植物物种仅与少数甚至单一根瘤菌物种或菌株进入生产性共生，反之亦然。只允许与能够高效固氮的根瘤菌菌株共生，是宿主植物防止根瘤菌作弊的关键策略。这种选择性在共生的所有阶段都得到加强，伙伴的选择是在植物和根瘤菌之间的初始交流期间开始的。然而，即使根部形成固氮根瘤，它也会受到影响。这篇综述阐述了有关双方在豆科植物-根瘤菌共生期间影响宿主范围的分子机制的最新知识。
Leguminous plants possess the almost unique ability to enter symbiosis with soil-resident, nitrogen fixing bacteria called rhizobia. During this symbiosis, the bacteria physically colonize specialized organs on the roots of the host plant called nodules, where they reduce atmospheric nitrogen into forms that can be assimilated by the host plant and receive photosynthates in return. In order for nodule development to occur, there is extensive chemical cross-talk between both parties during the formative stages of the symbiosis. The vast majority of the legume family are capable of forming root nodules and typically rhizobia are only able to fix nitrogen within the context of this symbiotic association. However, many legume species only enter productive symbiosis with a few, or even single rhizobial species or strains, and vice-versa. Permitting symbiosis with only rhizobial strains that will be able to fix nitrogen with high efficiency is a crucial strategy for the host plant to prevent cheating by rhizobia. This selectivity is enforced at all stages of the symbiosis, with partner choice beginning during the initial communication between the plant and rhizobia. However, it can also be influenced even once nitrogen-fixing nodules have developed on the root. This review sets out current knowledge about the molecular mechanisms employed by both parties to influence host range during legume-rhizobia symbiosis.
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发表时间：
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影响因子：
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