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ODR1, the key seed dormancy and germination regulator, promotes seed Proanthocyanidin biosynthesis via interaction with TTG1 and modulation of MBW complex activity

文献类型： 外文期刊

作者： Ding, Ling 1 ; Chen, Xi 2 ; Wang, Xu 2 ; Jiang, Wenhui 3 ; Xu, Xinyi 1 ; Hou, Mengmeng 4 ; Zhang, Yuanbo 5 ; Wu, Zhiqiang 2 ; Chang, Yuxiao 2 ; Xiang, Yong 2 ;

作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China

2.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Guangdong Lab Lingnan Modern Agr, Genome Anal Lab,Minist Agr, Shenzhen, Peoples R China

3.Guangxi Acad Agr Sci, Rice Res Inst, Guangxi Key Lab Rice Genet & Breeding, Nanning 530007, Guangxi, Peoples R China

4.Hainan Univ, Sch Breeding, Multiplicat Sanya Inst Breeding & Multiplicat, Sanya 572000, Peoples R China

5.Henan Univ, Sch Life Sci, State Key Lab Crop Stress Adaptat & Improvement, Kaifeng 475004, Peoples R China

关键词： seed dormancy and germination; ODR1/AtSdr4L; proanthocyanidins; TTG1; MBW complex

期刊名称：PLANT JOURNAL （ 影响因子：5.7； 五年影响因子：7.0 ）

ISSN： 0960-7412

年卷期： 2025 年 123 卷 4 期

页码：

收录情况： SCI

摘要： Seed dormancy and germination are crucial for both plant survival and reproduction and for crop sowing and harvesting. Proanthocyanidins (PAs), one of the most abundant seed metabolites, play a role in enhancing dormancy and inhibiting germination. Multiple regulatory factors involved in PAs biosynthesis can alter seed dormancy or germination capacity. However, whether the dormancy or germination factors reciprocally influence the PAs biosynthesis is unclear. Here, we report that ODR1, a seed dormancy and germination key factor and a transcriptional (co-) repressor, can regulate seed PAs biosynthesis and act as a transcriptional co-activator. The odr1 mutant shows lighter seed coat color, decreased PAs contents, and reduced expression of PAs biosynthesis genes, which are restored in the ODR1 complementary lines. ODR1 interacts with TTG1 and forms a complex with TTG1/TT2/TT8 (three MBW complex components), enhancing their activation on promoters of PAs biosynthesis genes like DFR and ANS. Overexpressing TTG1 in the odr1-2 mutant rescues or even reverses PA-related phenotypes of odr1-2, confirming that ODR1-mediated regulation of PAs biosynthesis is dependent on TTG1. Moreover, three homologous copies of ODR1 in rapeseed were identified, and simultaneous knockout of them reduces the PAs contents. These results revealed the previously uncharacterized functions of ODR1 in PAs biosynthesis, suggested its conservation between Arabidopsis and rapeseed, and provided important gene resources for rapeseed variety improvement.

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