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MeGT2.6 increases cellulose synthesis and active gibberellin content to promote cell enlargement in cassava

文献类型： 外文期刊

作者： Bao, Ruxue 1 ; Zeng, Changying 1 ; Li, Ke 1 ; Li, Mengtao 1 ; Li, Yajun 2 ; Zhou, Xincheng 1 ; Wang, Haiyan 2 ; Wang, Yajie 2 ; Huang, Dongyi 1 ; Wang, Wenquan 1 ; Chen, Xin 1 ;

作者机构： 1.Hainan Univ, Sanya Inst Breeding & Multiplicat, Natl Key Lab Trop Crop Breeding, Sanya 572025, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China

3.Hainan Inst Trop Agr Resources, Key Lab Biol & Genet Resources Trop Crops Hainan P, Haikou 571101, Hainan, Peoples R China

4.Chinese Acad Trop Agr Sci, Sanya Res Inst, Sanya 572025, Hainan, Peoples R China

关键词： cassava; gibberellin; cellulose synthase; cell wall; transcription factor

期刊名称：PLANT JOURNAL （ 影响因子：7.2； 五年影响因子：7.9 ）

ISSN： 0960-7412

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Cassava, a pivotal tropical crop, exhibits rapid growth and possesses a substantial biomass. Its stem is rich in cellulose and serves as a crucial carbohydrate storage organ. The height and strength of stems restrict the mechanised operation and propagation of cassava. In this study, the triple helix transcription factor MeGT2.6 was identified through yeast one-hybrid assay using MeCesA1pro as bait, which is critical for cellulose synthesis. Over-expression and loss-of-function lines were generated, and results revealed that MeGT2.6 could promote a significant increase in the plant height, stem diameter, cell size and thickness of SCW of cassava plant. Specifically, MeGT2.6 upregulated the transcription activity of MeGA20ox1 and downregulated the expression level of MeGA2ox1, thereby enhancing the content of active GA3, resulting in a large cell size, high plant height and long stem diameter in cassava. Moreover, MeGT2.6 upregulated the transcription activity of MeCesA1, which promoted the synthesis of cellulose and hemicellulose and produced a thick secondary cell wall. Finally, MeGT2.6 could help supply additional substrates for the synthesis of cellulose and hemicellulose by upregulating the invertase genes (MeNINV1/6). Thus, MeGT2.6 was found to be a multiple regulator; it was involved in GA metabolism and sucrose decomposition and the synthesis of cellulose and hemicellulose.

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