Zinc promotes nitrogen uptake and plant growth by regulating the antioxidant system and carbon–nitrogen metabolism under drought condition in apple plants

Yafei Guan, Lu Lei, Jingquan Liu, Mengxue Lyu, Xinxiang Xu, Yue Xing, Ziquan Feng, Chunling Liu, Hongmei Xie, Wei Ni, Hongguo Wang, Ruirui Zhang, Wenju Wu, Zisen Guo, Chengqiang Ding, Zhanling Zhu, Yuanmao Jiang, Shunfeng Ge