Responses of photosystem to long-term light stress in a typically shade-tolerant species Panax notoginseng oleh Zhu Cun, Zhu Cun, Zhu Cun, Xiang-Zeng Xu, Xiang-Zeng Xu, Xiang-Zeng Xu, Xiang-Zeng Xu, Jin-Yan Zhang, Jin-Yan Zhang, Jin-Yan Zhang, Sheng-Pu Shuang, Sheng-Pu Shuang, Sheng-Pu Shuang, Hong-Min Wu, Hong-Min Wu, Hong-Min Wu, Tong-Xin An, Jun-Wen Chen, Jun-Wen Chen, Jun-Wen Chen