Visible symptoms and changes in physiological parameters of Cinnamomum camphora and Michelia chapensis under ozone stress
by Lan Pan; Longhua Ye; Hongyue Chen; Ganwen Lie
International Journal of Environment and Pollution (IJEP), Vol. 70, No. 1/2, 2021

Abstract: The responses of Cinnamomum camphora and Michelia chapensis to ozone (O₃) exposure in terms of the O₃ injury and changes in the physiological parameters of their leaves were examined in charcoal-filtered (CF) air and O₃ at 1×, 2×, and 4×O₃ ambient concentrations in open-top chambers in an eight-month experimental period. High levels of O₃ exposure led to visible injuries in both species. The increased chlorophyll content in the second month and increased carotenoid content of the 1×O₃ treatment group at the end of experiment were identified as hormetic-compensatory strategies that enhance tolerance and acclimation to O₃ stress. Significant interaction effect between O₃and tree species with respect to the superoxide dismutase (SOD) activity and proline content suggests that the effects induced by O₃ were highly dependent on the tree species. C. camphora showed more foliar injury symptoms and greater O₃-induced decreases in the chlorophyll, carotenoid, and protein contents than M. chapensis, which suggests that C. camphora is more sensitive to O₃ than M. chapensis.

Online publication date: Mon, 17-Apr-2023

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