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Brittle Culm 1 Encodes a COBRA-Like Protein Involved in Secondary Cell Wall Cellulose Biosynthesis in Sorghum

文献类型： 外文期刊

作者： Li, Pan 1 ; Liu, Yanrong 4 ; Tan, Wenqing 1 ; Chen, Jun 1 ; Zhu, Mengjiao 1 ; Lv, Ya 1 ; Liu, Yishan 1 ; Yu, Shuancang 2 ; Z 1 ;

作者机构： 1.China Agr Univ, Dept Plant Genet Breeding & Seed Sci, Beijing Key Lab Crop Genet Improvement, Lab Crop Heterosis & Utilizat,MOE, Beijing 100193, Peoples R China

2.BAAFS, BVRC, Beijing 100097, Peoples R China

3.Minist Agr, Key Lab Biol & Genet Improvement Hort Crops North, Beijing 100097, Peoples R China

4.China Agr Univ, Dept Grassland Sci, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China

5.Japan Grassland Agr & Forage Seed Assoc, Forage Crop Res Inst, 388-5 Higashiakada, Nasushiobara, Tochigi 3292742, Japan

关键词： Biofuel; Cell wall; Cellulose synthesis; COBRA-like; Sorghum

期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.927； 五年影响因子：5.516 ）

ISSN： 0032-0781

年卷期： 2019 年 60 卷 4 期

页码：

收录情况： SCI

摘要： Plant mechanical strength contributes to lodging resistance and grain yield, making it an agronomically important trait in sorghum (Sorghum bicolor). In this study, we isolated the brittle culm 1 (bc1) mutant and identified SbBC1 through map-based cloning. SbBC1, a homolog of rice OsBC1 and Arabidopsis thaliana AtCOBL4, encodes a COBRA-like protein that exhibits typical structural features of a glycosylphosphatidylinositol-anchored protein. A single-nucleotide mutation in SbBC1 led to reduced mechanical strength, decreased cellulose content, and increased lignin content without obviously altering plant morphology. Transmission electron microscopy revealed reduced cell wall thickness in sclerenchyma cells of the bc1 mutant. SbBC1 is primarily expressed in developing sclerenchyma cells and vascular bundles in sorghum. RNA-seq analysis further suggested a possible mechanism by which SbBC1 mediates cellulose biosynthesis and cell wall remodeling. Our results demonstrate that SbBC1 participates in the biosynthesis of cellulose in the secondary cell wall and affects the mechanical strength of sorghum plants, providing additional genetic evidence for the roles of COBRA-like genes in cellulose biosynthesis in grasses.

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