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A CYC/TB1-type TCP transcription factor controls spikelet meristem identity in barley

文献类型： 外文期刊

作者： Shang, Yi 1 ; Yuan, Lu 3 ; Di, Zhaocan 3 ; Jia, Yong 4 ; Zhang, Zhenlan 1 ; Li, Sujuan 5 ; Xing, Liping 3 ; Qi, Zengjun 3 ;

作者机构： 1.Hybrid Rapeseed Res Ctr Shaanxi Prov, Yangling 712100, Shaanxi, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Hangzhou 310021, Peoples R China

3.Nanjing Agr Univ JCIC MCP, Cytogenet Inst, Natl Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China

4.Murdoch Univ, Western Barley Genet Alliance, 90 South St, Murdoch, WA 6150, Australia

5.Zhejiang Acad Agr Sci, Cent Lab, Hangzhou 310021, Peoples R China

6.Jiangxi Univ Tradit Chinese Med, Nanchang 330004, Jiangxi, Peoples R China

7.Southwest Univ Sci & Technol, Sch Life Sci & Engn, Wheat Res Inst, Mianyang 621010, Sichuan, Peoples R China

8.Univ Adelaide, Sch Agr Food & Wine, Waite Campus, Urrbrae, SA 5064, Australia

9.Yangtze Univ, Hubei Collaborat Innovat Ctr Grain Ind, Jingzhou, Hubei, Peoples R China

关键词： Barley; BRANCHED AND INDETERMINATE SPIKELET 1 (BDI1); deletion; determinacy; inflorescence architecture; map-based cloning; spikelet meristem; TCP transcription factor; transcriptome sequencing (RNA-Seq); virus-induced gene silencing (VIGS)

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2020 年 71 卷 22 期

页码：

收录情况： SCI

摘要： Barley possesses a branchless, spike-shaped inflorescence where determinate spikelets attach directly to the main axis, but the developmental mechanism of spikelet identity remains largely unknown. Here we report the functional analysis of the barley gene BRANCHED AND INDETERMINATE SPIKELET 1 (BDI1), which encodes a TCP transcription factor and plays a crucial role in determining barley inflorescence architecture and spikelet development. The bdi1 mutant exhibited indeterminate spikelet meristems that continued to grow and differentiate after producing a floret meristem; some spikelet meristems at the base of the spike formed two fully developed seeds or converted to branched spikelets, producing a branched inflorescence. Map-based cloning analysis showed that this mutant has a deletion of similar to 600 kb on chromosome 5H containing three putative genes. Expression analysis and virus-induced gene silencing confirmed that the causative gene, BDI1, encodes a CYC/TB1-type TCP transcription factor and is highly conserved in both wild and cultivated barley. Transcriptome and regulatory network analysis demonstrated that BDI1 may integrate regulation of gene transcription cell wall modification and known trehalose-6-phosphate homeostasis to control spikelet development. Together, our findings reveal that BDI1 represents a key regulator of inflorescence architecture and meristem determinacy in cereal crop plants.

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