Into the Root: How Cytokinin Controls Rhizobial Infection

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• 作者：Mandana Miri¹ ; ² ; Preetam Janakirama¹ ; Mark Held¹ ; ³ ; Loretta Ross¹ ; Krzysztof Szczyglowski¹ ; ² ; ^{Krzysztof.Szczyglowski@agr.gc.ca" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Legumes ; symbiosis ; infection ; cytokinin ; ethylene
• 刊名：Trends in Plant Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：21
• 期：3
• 页码：178-186
• 全文大小：1729 K

文摘

Leguminous plants selectively initiate primary responses to rhizobial nodulation factors (NF) that ultimately lead to symbiotic root nodule formation. Functioning downstream, cytokinin has emerged as the key endogenous plant signal for nodule differentiation, but its role in mediating rhizobial entry into the root remains obscure. Nonetheless, such a role is suggested by aberrant infection phenotypes of plant mutants with defects in cytokinin signaling. We postulate that cytokinin participates in orchestrating signaling events that promote rhizobial colonization of the root cortex and limit the extent of subsequent infection at the root epidermis, thus maintaining homeostasis of the symbiotic interaction. We further argue that cytokinin signaling must have been crucial during the evolution of plant cell predisposition for rhizobial colonization.