Effects of High Temperature Stress on Multispectral Fluorescence and An-tioxidant Enzyme in Two Chinese Fir Provenances
This study selected two-year old Chinese fir provenances from Sanming in Fujian Province(FJSM)and Jiujiang in Jiangxi Province(JXJJ)as experimental materials,and conducted pot experiments in an artificial cli-mate box to study the effects of different temperatures(25 ℃,30 ℃,35 ℃,40 ℃)on the antioxidant enzyme ac-tivity and multispectral fluorescence of the two Chinese fir provenances.The results showed that the multispectral fluorescence parameters F440,F520,F690,F740 and their ratios F690/F740 of Chinese fir increased with the in-crease of high temperature stress.Under high temperature stress,the elevation of F690/F740 in FJSM was lower than that in JXJJ.The elevation of F690/F740 indicated a decrease in chlorophyll content,the slower chlorophyll degradation rate in FJSM under high temperature stress suggested a stronger resistance to high temperatures.In ad-dition,after high temperature stress,the overall activity of antioxidant enzymes such as SOD,POD,and CAT in Chinese fir increased.Compared with the JXJJ source,FJSM showed a greater increase in antioxidant enzyme ac-tivity and a smaller decrease trend under high temperature stress,indicating that FJSM's stronger high-temperature resistance is closely related to antioxidant enzymes.
Chinese firHigh temperature stressMultispectral fluorescenceAntioxidant enzyme
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