Genome-wide association study and transcriptome analysis reveal key genes controlling fruit branch angle in cotton oleh Panxia Shao, Yabin Peng, Yuanlong Wu, Jing Wang, Zhenyuan Pan, Yang Yang, Nurimanguli Aini, Chunping Guo, Guangling Shui, Lei Chao, Xiaomin Tian, Qiushuang An, Qingyong Yang, Chunyuan You, Chunyuan You, Lu Lu, Xianlong Zhang, Maojun Wang, Xinhui Nie