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The GmSTF1/2-GmBBX4 negative feedback loop acts downstream of blue-light photoreceptors to regulate isoflavonoid biosynthesis in soybean

文献类型： 外文期刊

作者： Song, Zhaoqing 1 ; Zhao, Fengyue 1 ; Chu, Li 1 ; Lin, Huan 1 ; Xiao, Yuntao 1 ; Fang, Zheng 1 ; Wang, Xuncheng 2 ; Dong, Jie 3 ; Lyu, Xiangguang 4 ; Yu, Deyue 1 ; Liu, Bin 4 ; Gai, Junyi 1 ; Xu, Dongqing 1 ;

作者机构： 1.Nanjing Agr Univ, Natl Ctr Soybean Improvement, State Key Lab Crop Genet & Germplasm Enhancement &, Coll Agr, Nanjing 210095, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing Key Lab Environmentally Friendly Managemen, Beijing 100097, Peoples R China

3.Zhejiang Univ, Coll Agr & Biotechnol, Inst Crop Sci, Hangzhou 310058, Peoples R China

4.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China

关键词： photoreceptor; light signaling; isoflavonoid; GmSTF; GmBBX4; soybean

期刊名称：PLANT COMMUNICATIONS （ 影响因子：10.5； 五年影响因子：10.5 ）

ISSN： 2590-3462

年卷期： 2024 年 5 卷 2 期

页码：

收录情况： SCI

摘要： Isoflavonoids, secondary metabolites derived from the phenylalanine pathway, are predominantly biosynthesized in legumes, especially soybean (Glycine max). They are not only essential for plant responses to biotic and abiotic stresses but also beneficial to human health. In this study, we report that light signaling controls isoflavonoid biosynthesis in soybean. Blue -light photoreceptors (GmCRY1s, GmCRY2s, GmPHOT1s, and GmPHOT2s) and the transcription factors GmSTF1 and GmSTF2 promote isoflavonoid accumulation, whereas the E3 ubiquitin ligase GmCOP1b negatively regulates isoflavonoid biosynthesis. GmPHOT1s and GmPHOT2s stabilize GmSTF1/2, whereas GmCOP1b promotes the degradation of these two proteins in soybean. GmSTF1/2 regulate the expression of approximately 27.9% of the genes involved in soybean isoflavonoid biosynthesis, including GmPAL2.1, GmPAL2.3, and GmUGT2. They also repress the expression of GmBBX4, a negative regulator of isoflavonoid biosynthesis in soybean. In addition, GmBBX4 physically interacts with GmSTF1 and GmSTF2 to inhibit their transcriptional activation activity toward target genes related to isoflavonoid biosynthesis. Thus, GmSTF1/2 and GmBBX4 form a negative feedback loop that acts downstream of photoreceptors in the regulation of isoflavonoid biosynthesis. Our study provides novel insights into the control of isoflavonoid biosynthesis by light signaling in soybean and will contribute to the breeding of soybean cultivars with high isoflavonoid content through genetic and metabolic engineering.

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