A copy number variant at the HPDA-D12 locus confers compact plant architecture in cotton.

The New phytologist 2021 Feb

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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. © 2020 The Authors New Phytologist © 2020 New Phytologist Foundation.

Citation

Gaoxiang Ji, Chengzhen Liang, Yingfan Cai, Zhaoe Pan, Zhigang Meng, Yanyan Li, Yinhua Jia, Yuchen Miao, Xinxin Pei, Wenfang Gong, Xiaoyang Wang, Qiong Gao, Zhen Peng, Liru Wang, Junling Sun, Xiaoli Geng, Pengpeng Wang, Baojun Chen, Peilin Wang, Tao Zhu, Shoupu He, Rui Zhang, Xiongming Du. A copy number variant at the HPDA-D12 locus confers compact plant architecture in cotton. The New phytologist. 2021 Feb;229(4):2091-2103