Exogenous leucine alleviates heat stress and improves saponin synthesis in Panax notoginseng by improving antioxidant capacity and maintaining metabolic homeostasis oleh Haijiao Liu, Haijiao Liu, Yingwei Su, Yingwei Su, Yunxia Fan, Yunxia Fan, Denghong Zuo, Denghong Zuo, Jie Xu, Jie Xu, Yixiang Liu, Yixiang Liu, Xinyue Mei, Xinyue Mei, Huichuan Huang, Huichuan Huang, Min Yang, Min Yang, Shusheng Zhu, Shusheng Zhu