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BRITTLE PLANT1 is required for normal cell wall composition and mechanical strength in rice 被引量:1
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作者 Yuanyan Zhang Yihua Wang +13 位作者 Chunming Wang Carsten Rautengarten Erchao Duan Jianping Zhu Xiaopin Zhu Jie Lei Chao Peng Yunlong Wang Xuan Teng Yunlu Tian Xi Liu Joshua LHeazlewood Aimin Wu Jianmin Wan 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2021年第5期865-877,共13页
A series of nucleotide sugar interconversion enzymes(NSEs) generate the activated sugar donors required for biosynthesis of cell wall matrix polysaccharides and glycoproteins. UDPglucose 4-epimerases(UGEs) are NSEs th... A series of nucleotide sugar interconversion enzymes(NSEs) generate the activated sugar donors required for biosynthesis of cell wall matrix polysaccharides and glycoproteins. UDPglucose 4-epimerases(UGEs) are NSEs that function in the interconversion of UDP-glucose(UDP-Glc) and UDP-galactose(UDP-Gal). The roles of UDP-glucose 4-epimerases in monocots remain unclear due to redundancy in the pathways. Here, we report a brittle plant(bp1) rice mutant that exhibits brittle leaves and culms at all growth stages. The mutant culms had reduced levels of rhamnogalacturonan I, homogalacturonan, and arabinogalactan proteins.Moreover, the mutant had altered contents of uronic acids, neutral noncellulosic monosaccharides, and cellulose. Map-based cloning demonstrated that OsBP1 encodes a UDPglucose 4-epimerase(OsUGE2), a cytosolic protein. We also show that BP1 can form homoand hetero-protein complexes with other UGE family members and with UDP-galactose transporters 2(OsUGT2) and 3(OsUGT3), which may facilitate the channeling of Gal to polysaccharides and proteoglycans. Our results demonstrate that BP1 participates in regulating the sugar composition and structure of rice cell walls. 展开更多
关键词 arabinogalactan proteins Oryza sativa rhamnogalacturonan I udp-galactose/glucose 4-epimerase
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