2025-03-12 中国科学院(CAS)
<関連情報>
- https://english.cas.cn/newsroom/research_news/life/202503/t20250310_903475.shtml
- https://www.nature.com/articles/s41477-025-01937-7
DG1プロモーターにおける染色体逆転がソルガムにおいて二粒胞を形成し、穀物収量を増加させる Chromosomal inversion at the DG1 promoter drives double-grain spikelets and enhances grain yield in sorghum
Dan Zhang,Sanyuan Tang,Junyu Chen,Fangyuan Liu,Kangxu Zhao,Lu Kang,Chao Li,Ran Xia,Fang Yang,Feifei Yu,Cheng-Guo Duan,Peng Xie & Qi Xie
Nature Plants Published:11 March 2025
DOI:https://doi.org/10.1038/s41477-025-01937-7
Abstract
The phenomenon of multiple-grain spikelets is frequently observed in gramineous crops. In the case of dual-floret spikelets, the upper fertile floret develops normally to form a single grain, while the lower sterile floret undergoes abortion. Here we elucidate the role of Double-Grain 1 (DG1), a gene encoding a homeobox-domain-containing protein, in regulating the lower floret meristem activity and double-grain spikelet trait in sorghum. A 35.7-kb paracentric inversion in the DG1 promoter region leads to increased DG1 expression, probably by reducing repressive histone modifications. This increase in DG1 expression transforms the degenerated lower floret into a fertile one. The use of the superior DG1 allele results in an increase of approximately 40.7% to 46.1% in grain number per panicle and a 10.1% to 14.3% increase in overall grain yield. Our findings shed light on the sorghum double-grain spikelet characteristic, offering valuable insights for high-yield breeding designs in cereals.
