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MULTI-FLORET SPIKELET 2, a MYB Transcription Factor, Determines Spikelet Meristem Fate and Floral Organ Identity in Rice

文献类型： 外文期刊

作者： Li, Yun-Feng 1 ; Zeng, Xiao-Qin 1 ; Li, Yun 2 ; Wang, Ling 1 ; Zhuang, Hui 1 ; Wang, Yan 1 ; Tang, Jun 1 ; Wang, Hong-Lei 1 ;

作者机构： 1.Southwest Univ, Rice Res Inst, Key Lab Applicat & Safety Control Genetically Mod, Acad Agr Sci, Chongqing 400715, Peoples R China

2.Minist Agr, Sichuan Acad Agr Sci, Key Lab Southwest Rice Biol & Genet Breeding, Rice & Sorghum Res Inst, Deyang 618000, Sichuan, Peoples R China

期刊名称：PLANT PHYSIOLOGY （ 影响因子：8.34； 五年影响因子：8.972 ）

ISSN： 0032-0889

年卷期： 2020 年 184 卷 2 期

页码：

收录情况： SCI

摘要： An understanding of flower and panicle development is crucial for improving yield and quality in majority of grass crops. In this study, we used mapping-based cloning to identify MULTI-FLORET SPIKELET2 (MFS2), which encodes a MYB transcription factor and regulates flower and spikelet development in rice (Oryza sativa). In the mfs2 mutant, specification of palea identity was severely disturbed and showed degradation or transformation into a lemma-like organ, and the number of all floral organs was increased to varying degrees. Due to the increase in the number of floral organs and development of extra transformed palea/marginal region of the palea-like organs, some mfs2 spikelets had a tendency to produce two florets. These defects implied that the mfs2 mutation caused abnormal specification of palea identity and partial loss of spikelet determination. We confirm that MFS2 is a transcriptional repressor that shows strong repression activity by means of two typical ethylene-responsive element binding factor-associated amphiphilic motifs, one of which locates at the C terminus and is capable of interaction with three rice TOPLESS and TOPLESS-related proteins. The results indicate that MFS2 acts as a repressor that regulates floral organ identities and spikelet meristem determinacy in rice by forming a repression complex with rice TOPLESS and TOPLESS-related proteins.

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