Putrescine protects hulless barley from damage due to UV-B stress via H2S- and H2O2-mediated signaling pathways - Qien Li; Zhaofeng Wang; Yanning Zhao; Xiaochen Zhang; Shuaijun Zhang; Letao Bo; Yao Wang; Yingfeng Ding; Lizhe An (Plant Cell Reports, 2016)