9Daud M K, He Q L, Lei M, et al. Ultrastructural, metabolic and proteomic changes in leaves of upland cotton in response to cadmium stress [J]. Chemosphere, 2015(120): 309-320.
10Liang Q H, Huang W H, Jarvis P. Use of a SPAD meter to measure leaf chlorophyll concentration in Arbidopsis thaliana [J]. Photosynth Res, 2011, 107: 209-213.