豆科植物与根瘤菌形成共生关系,并将大气中的氮固定在称为根瘤的特殊根器官中。众所周知,盐胁迫通过降低根瘤菌生长来抑制根瘤共生,根瘤菌感染,结节数,和不同豆科植物中的固氮酶活性。尽管有这些知识,控制盐胁迫抑制结瘤和固氮的遗传和分子机制仍然难以捉摸。在这个观点中,我们总结了根据土壤中的盐含量塑造这种共生关系的遗传机制的最新知识。我们强调调节转录因子NoduleInception的活性以相应地正确塑造与根瘤菌的共生关系的相关性。我们还强调了知识空白,这对于更深入地了解根瘤共生适应盐胁迫条件的分子机制至关重要。我们认为,即使在盐胁迫条件下,填补这些空白也有助于改善豆类结瘤并利用其生态效益。
Legumes form a symbiotic association with rhizobia and fix atmospheric nitrogen in specialized root organs known as nodules. It is well known that salt stress inhibits root nodule symbiosis by decreasing rhizobial growth, rhizobial infection, nodule number, and nitrogenase activity in diverse legumes. Despite this knowledge, the genetic and molecular mechanisms governing salt stress\'s inhibition of nodulation and nitrogen fixation are still elusive. In this Viewpoint, we summarize the most recent knowledge of the genetic mechanisms that shape this symbiosis according to the salt levels in the soil. We emphasize the relevance of modulating the activity of the transcription factor Nodule Inception to properly shape the symbiosis with rhizobia accordingly. We also highlight the knowledge gaps that are critical for gaining a deeper understanding of the molecular mechanisms underlying the adaptation of the root nodule symbiosis to salt-stress conditions. We consider that filling these gaps can help to improve legume nodulation and harness its ecological benefits even under salt-stress conditions.