A copy number variant at the HPDA‐D12 locus confers compact plant architecture in cotton
2021
Ji, Gaoxiang | Liang, Chengzhen | Cai, Yingfan | Pan, Zhaoe | Meng, Zhigang | Li, Yanyan | Jia, Yinhua | Miao, Yuchen | Pei, Xinxin | Gong, Wenfang | Wang, Xiaoyang | Gao, Qiong | Peng, Zhen | Wang, Liru | Sun, Junling | Geng, Xiaoli | Wang, Pengpeng | Chen, Baojun | Wang, Peilin | Zhu, Tao | He, Shoupu | Zhang, Rui | Du, Xiongming
Improving yield is a primary mission for cotton (Gossypium hirsutum) breeders; development of cultivars with suitable architecture for high planting density (HPDA) can increase yield per unit area. We characterized a natural cotton mutant, AiSheng98 (AS98), which exhibits shorter height, shorter branch length, and more acute branch angle than wild‐type. A copy number variant at the HPDA locus on Chromosome D12 (HPDA‐D12), encoding a dehydration‐responsive element‐binding (DREB) transcription factor, GhDREB1B, strongly affects plant architecture in the AS98 mutant. We found an association between a tandem duplication of a c. 13.5 kb segment in HPDA‐D12 and elevated GhDREB1B expression resulting in the AS98 mutant phenotype. GhDREB1B overexpression confers a significant decrease in plant height and branch length, and reduced branch angle. Our results suggest that fine‐tuning GhDREB1B expression may be a viable engineering strategy for modification of plant architecture favorable to high planting density in cotton.
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