ZHAO Ming-xiang, ZHANG Qi, ZHAO De-guo, XIANG Rong-rong, ZHU Yong-li, BAO Zhi-juan. 2018: Effects of chromium ions with different valences on antioxidant key enzymes and root activity of tobacco seedlings. Journal of Southern Agriculture, 49(11): 2155-2161. DOI: 10.3969/j.issn.2095-1191.2018.11.06