期刊
MOLECULAR PLANT
卷 14, 期 2, 页码 298-314出版社
CELL PRESS
DOI: 10.1016/j.molp.2020.11.016
关键词
cryptochrome; soybean; shade avoidance; low blue light; gibberellin
资金
- National Key Research and Development Plan [2016YFD0100201]
- National Transgenic Science and Technology Program [2016ZX08010-002]
- National Natural Science Foundation of China [31422041, 31871705]
- Agricultural Science and Technology Innovation Program (ASTIP) of the Chinese Academy of Agricultural Sciences
- Central Public-Interest Scientific Institution Basal Research Fund
It was found that low blue light mainly induces excessive stem elongation in soybean, while the integration of GmCRY1-mediated signals with the GA metabolic pathway can regulate soybean leaf phototropic growth and improve agronomic traits.
Soybean is an important legume crop that displays the classic shade avoidance syndrome (SAS), including exaggerated stem elongation, which leads to lodging and yield reduction under density farming conditions. Here, we compared the effects of two shade signals, low red light to far-red light ratio (R:FR) and low blue light (LBL), on soybean status and revealed that LBL predominantly induces excessive stem elongation. We used CRISPR-Cas9-engineered Gmcry mutants to investigate the functions of seven cryptochromes (GmCRYs) in soybean and found that the four GmCRY1s overlap in mediating LBL-induced SAS. Light-activated GmCRY1s increase the abundance of the bZIP transcription factors STF1 and STF2, which directly upregulate the expression of genes encoding GA2 oxidases to deactivate GA-1 and repress stem elongation. Notably, GmCRY1b overexpression lines displayed multiple agronomic advantages over the wild-type control under both dense planting and intercropping conditions. Our study demonstrates the integration of GmCRY1-mediated signals with the GA metabolic pathway in the regulation of LBL-induced SAS in soybean. It also provides a promising option for breeding lodging-resistant, high-yield soybean cultivars in the future.
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