数字农科院2.0

A B3 Domain Transcription Factor NtMAB1 Regulates the Release and Outgrowth of Axillary Buds in Tobacco

文献类型： 外文期刊

作者： Xue, Luyao;Xia, Fei;Song, Wenting;Wu, Xinru;Jin, Xiaoshan;Zhong, Qun;Sun, Tingting;Dai, Changbo;Liu, Guanshan;Sun, Yuhe;Liu, Chunming;Li, Shengjun;Yao, Xuefeng;Wang, Dawei

作者机构：

关键词： gibberellins (GAs);NtGA2ox8;NtMAB1-S1;NtTPPF;trehalose-6-phosphate (Tre6p)

期刊名称： PLANT BIOTECHNOLOGY JOURNAL

ISSN： 1467-7644

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： The release and outgrowth of axillary buds are essential parts of the process of shoot branching in plants, but knowledge of the underlying regulatory mechanisms remains limited. Analysis of mab1-D, a tobacco mutant with a greater number of axillary branches, showed that the mutant phenotype resulted from positive modulation of axillary buds release and outgrowth. TAIL-PCR and co-separation analyses suggested that NtMAB1-S1, a member of the Related to ABI3/VP1 (RAV) subfamily that was highly expressed in the base of axillary buds, was associated with the mutant phenotype. Phenotypic analyses of mab1-D overexpression, knockdown, knockout and complementation lines demonstrated that NtMAB1-S1 was a positive regulator of axillary buds release and outgrowth. NtMAB1-S1 accelerated these processes through transcriptional repression via the B3 repression domain. RNA-sequencing analysis revealed that NtMAB1-S1 was involved in the trehalose-6-phosphate and gibberellin metabolism pathways. Moreover, NtMAB1-S1 enhanced the release and outgrowth of axillary buds by directly repressing transcription of NtTPPF, a trehalose-6-phosphate phosphatase, and NtGA2ox8, a gibberellin oxidase. NtMAB1-S1 thus plays a pivotal role in regulating the release and outgrowth of axillary buds and is a potential target for genetic interventions aimed at shaping ideal plant architecture.

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