A novel bHLH gene responsive to low nitrogen positively regulates the biosynthesis of medicinal tropane alkaloids in Atropa belladonna

Yuqin Gou, Yanming Jing, Jiaxin Song, Mohammad Mahmoud Nagdy, Chao Peng, Lingjiang Zeng, Min Chen, Xiaozhong Lan, Zun Lai Lai Htun, Zhihua Liao, Yan Li