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LI Jing, XU Zhi-Fang, YE Wan-Hui. Effects of Different Stress Treatments on Chlorophyll a Fluorescence in Detached Leaves of Castanopsis hystrix[J]. Plant Science Journal, 2006, 24(5): 429-434.
Citation: LI Jing, XU Zhi-Fang, YE Wan-Hui. Effects of Different Stress Treatments on Chlorophyll a Fluorescence in Detached Leaves of Castanopsis hystrix[J]. Plant Science Journal, 2006, 24(5): 429-434.

Effects of Different Stress Treatments on Chlorophyll a Fluorescence in Detached Leaves of Castanopsis hystrix

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  • Received Date: March 02, 2006
  • Revised Date: June 20, 2006
  • Published Date: October 23, 2006
  • In order to learn about some basic biological characteristics of Castanopsis hystrix,one dominant or constructive tree species in the subtropical evergreen broad-leaved forests,effects of radiation,temperature and water stress on several parameters of chlorophyll a fluorescence in detached leaves of(C.hystrix)were studied.The results showed that:(1)The Fv/Fm(maximal photochemical efficiency of PSⅡ)in leaves of C.hystrix only decreased 6.1% after the treatment by strong light intensity,comparing to Fv/Fm in leaves of Psychotria rubra,a shade-tolerant shrub,which had a stronger inhibition((17.17%))under same light stress,suggesting C.hystrix had favourable adaptation to sun environment;(2)Little decrease in ETR(electron transport rate)with consistent Fo in the detached leaves treated by 4℃ for 72 h indicated the insensitivity to short-time chilling;(3)No significant difference in Fv/Fo and Fv/Fm demonstrated little influence on PSⅡ potential activity and maximal photochemical efficiency of(PSⅡ)by chilling treatment in the dark;(4)A significant decrease in ETR,Fv/Fm and Fv/Fo((p<0.01))and the great increase in Fo(p<0.05)by hot shock at 40℃ to the leaves for 2 h and 4 h,respectively,showed potential damage to its photochemical reaction center;(5)Increase in Fo by(44.7%)and decrease in Fv/Fm by 22.4% and Fv/Fo by 54.4% in the leaves with water detect simulated by PEG after one-day treatment independently reflected inhibition of the potential efficiency suggesting(intolerance)to drought for C.hystrix.
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