Key message

AtMYB2 protein represses the formation of axillary meristems in response to environmental stresses so that plants can undergo a shorter vegetative development stage under environmental stresses.

Abstract

Shoot branching is an important event determined by endogenous factors during the development of plants. The formation of axillary meristem is also significantly repressed by environmental stresses and the underlying mechanism is largely unknown. The REGULATOR OF AXILLARY MERISTEMS (RAX) genes encode the R2R3 MYB transcription factors that have been shown to regulate the formation of axillary meristems in Arabidopsis. The AtMYB2 is also a member of R2R3 MYB gene family whose expression is usually induced by the environmental stresses. In this study, our results showed that AtMYB2 protein plays a pivotal negative regulatory role in the formation of axillary meristem. AtMYB2 is mainly expressed in the leaf axils as that of RAX1. The environmental stresses can increase the expression of AtMYB2 protein which further inhibits the expression of RAX1 gene by binding to its promoter. Therefore, AtMYB2 protein represses the formation of axillary meristems in response to environmental stresses so that plants can undergo a shorter vegetative development stage under environmental stresses.

中文翻译：

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AtMYB2通过在环境胁迫下抑制RAX1基因来抑制拟南芥腋生分生组织的形成。

关键信息

AtMYB2 蛋白抑制腋生分生组织的形成以响应环境胁迫，从而使植物在环境胁迫下可以经历较短的营养发育阶段。

抽象的

枝条分枝是植物发育过程中由内源性因素决定的重要事件。腋生分生组织的形成也受到环境压力的显着抑制，其潜在机制在很大程度上是未知的。腋生分生组织调节因子( RAX ) 基因编码R2R3 MYB 转录因子，这些转录因子已被证明可调节拟南芥腋生分生组织的形成。AtMYB2也是R2R3 MYB基因家族的成员，其表达通常由环境胁迫诱导。在本研究中，我们的研究结果表明 AtMYB2 蛋白在腋生分生组织的形成中起关键的负调控作用。在MYB2与RAX1一样，主要在叶腋中表达。环境胁迫可以增加AtMYB2蛋白的表达，从而通过与其启动子结合进一步抑制RAX1基因的表达。因此，AtMYB2 蛋白抑制腋生分生组织的形成以响应环境胁迫，从而使植物在环境胁迫下能够经历较短的营养发育阶段。