Right time, right place: The dynamic role of hormones in rhizobial infection and nodulation of legumes  

作　　者：Karen Velandia James B.Reid Eloise Foo 

机构地区：[1]Discipline of Biological Sciences,School of Natural Sciences,University of Tasmania,Private Bag 55,Hobart,TAS 7001,Australia

出　　处：《Plant Communications》2022年第5期5-18,共14页植物通讯（英文）

摘　　要：Many legume plants form beneficial associations with rhizobial bacteria that are hosted in new plant rootorgans, nodules, in which atmospheric nitrogen is fixed. This association requires the precise coordinationof two separate programs, infection in the epidermis and nodule organogenesis in the cortex. There isextensive literature indicating key roles for plant hormones during nodulation, but a detailed analysis ofthe spatial and temporal roles of plant hormones during the different stages of nodulation is required.This review analyses the current literature on hormone regulation of infection and organogenesis to revealthe differential roles and interactions of auxin, cytokinin, brassinosteroids, ethylene, and gibberellins during epidermal infection and cortical nodule initiation, development, and function. With the exception ofauxin, all of these hormones suppress infection events. By contrast, there is evidence that all of these hormones promote nodule organogenesis, except ethylene, which suppresses nodule initiation. This differential role for many of the hormones between the epidermal and cortical programs is striking. Future work isrequired to fully examine hormone interactions and create a robust model that integrates this knowledgeinto our understanding of nodulation pathways.

关 键 词：auxin BRASSINOSTEROIDS CYTOKININ ethylene GIBBERELLIN NODULATION 

分 类 号：Q94[生物学—植物学]