MePHD1.2 affects the synthesis of cyanogenic glycosides by regulating of MeCYP79D2 in cassava
文献类型： 外文期刊
作者： Li, Mengtao 1 ; Zhao, Xiao 3 ; Li, Yajun 1 ; Li, Yuanchao 3 ; Zhao, Xiaoye 6 ; Mai, Weitao 1 ; Khan, Luqman 1 ; Liang, Qibing 6 ; Yin, Qingchun 7 ; Wang, Wenquan 1 ; Liu, Jinping 1 ; Chen, Xin 1 ;
作者机构： 1.Hainan Univ, Inst Trop Agr & Forestry, Haikou 570228, Peoples R China
2.Natl Key Lab Trop Crop Breeding, Sanya 572025, Hainan, Peoples R China
3.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China
4.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Hubei, Peoples R China
5.Guangxi Univ, Coll Life Sci & Technol, State Key Lab Conservat & Utilizat Subtrop Agrobio, Nanning 530004, Guangxi, Peoples R China
6.Hainan Food & Drug Inspect Inst, Haikou Branch, Haikou 570311, Hainan, Peoples R China
7.Hainan Inst Food Control, Key Lab Trop Fruits & Vegetables Qual & Safety Sta, Haikou 570314, Hainan, Peoples R China
8.Chinese Acad Trop Agr Sci, Sanya Res Inst, Sanya 572025, Hainan, Peoples R China
关键词： Cyanogenic glycosides; Cytochrome P450; Manihot esculenta; MePHD1.2
期刊名称：CROP JOURNAL （ 影响因子：5.6； 五年影响因子：6.0 ）
ISSN： 2095-5421
年卷期： 2025 年 13 卷 1 期
页码：
收录情况： SCI
摘要： The high content of cyanogenic glycosides (CG) in cassava tubers affects food safety. CG are involved in the plant growth and development and protect cassava leaves from herbivorous predators. However, the regulatory mechanism of CG biosynthesis remains poorly understood. Here, yeast one-hybrid assays were performed using a mixed cDNA library of cassava tubers and leaves as prey and the promoter of MeCYP79D2 as bait. MeCYP79D2, a cytochrome P450 protein, is the rate-limiting enzyme for CG synthesis in cassava. From this information, a candidate regulator of MeCYP79D2 was selected and identified as transcription factor MePHD1.2. MePHD1.2, located in the nucleus and exhibiting an inhibitory transcription activity directly bound to an AT-rich motif in the promoter of MeCYP79D2. In cassava, the transcriptional activity of MeCYP79D2 was considerably enhanced in mephd1.2 mutant lines leading to increased linamarin and lotaustralin contents. Deletion of MePHD1.2 promoted the production of CGs in cassava and decreased transcription inhibition on MeCYP79D2, exposing a novel regulatory module governing biosynthesis of CGs. (c) 2024 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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