Effect of Polyamines,Putrescine,Spermidine and Spermine on Chloro-phyll Fluorescence Parameters of Cucumber Seedlings under Low Tem-perature Stress
CAO Yu-jie
QIAN Chun-tao
BO Kai-liang
CHENG Chun-yan
CHEN Jin-feng
Abstract：Cucumber seedlings of two true leaves were sprayed by exogenous PAs (Put,Spd,Spm ) and then they were stressed under low temperature of 8℃/8℃for three days and recovered for one day. Effect of exogenous PAs on the changes of chlorophyll fluorescence parameters of cucumber seedlings under low temperature stress was studied. The results indicat-ed that the fluorescent parameters of chlorophyll, Fm,Fv/Fm and Fv/F0 appeared to decline and F0 appeared to increase, suggesting that PSII could be damaged,causing some decrease of primary light energy conversion and potential activities of PSII. Compared with the control treatment,exogenous PAs pre-treatment could significantly promote the increment of Fm, Fv/Fm,and Fv/F0,whereas decreased F0.The effect of exogenous PAs on cold-tolerance of cucumber is proved again by im-proving the changes of chlorophyll fluorescence parameters of cucumber seedlings.
Keywords：CucumberLow temperature stressPasChlorophyll fluorescence parameters
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 10-13 )