The AtMYB2 inhibits the formation of axillary meristem in Arabidopsis by repressing RAX1 gene under environmental stress
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ORIGINAL ARTICLE
The AtMYB2 inhibits the formation of axillary meristem in Arabidopsis by repressing RAX1 gene under environmental stresses Tianqi Jia1 · Kaidian Zhang1 · Fan Li1 · Yifeng Huang1 · Manman Fan1 · Tao Huang1 Received: 13 March 2020 / Accepted: 13 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Axillary meristem · AtMYB2 · RAX1 · Environmental stress
Introduction Branching patterns is an important trait that determines the stature of plants during the post-embryonic development. The axillary meristems (AMs) are initiated from the stem cells in leaf axils under the regulation of endogenous transcription factors. The MYB superfamily has more than 160 members which are involved in various aspects of development of Arabidopsis (Riechmann and Ratcliffe 2000). The REGULATOR OF AXILLARY MERISTEMS1 (RAX1) encoding a R2R3 MYB protein AtMYB37 has been shown to play a pivotal role in the initiation of AMs (Keller et al. 2006; Communicated by Neal Stewart. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00299-020-02602-3) contains supplementary material, which is available to authorized users. * Tao Huang [email protected] 1
School of Life Sciences, Xiamen University, Xiamen 361102, Fujian, China
Muller et al. 2006). RAX1 is expressed in the axils of leaf primodia and interacts with CUP-SHAPED COTYLEDON (CUC) genes to specify a stem cell niche for AM formation (Keller et al. 2006; Muller et al. 2006). RAX2 (AtMYB38) and RAX3 (AtMYB84) have the redundant functions with RAX1 in AM initiation (Muller et al. 2006). In addition, as an ortholgue of MONOCULM1 in rice, mutation in the LATERAL SUPPRESSOR (LAS) also causes a com
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