Effects of salicylic acid on photosynthetic apparatus PS Ⅱ in leaves of young grape plants under heat stress and during the recovery period from stress
FAN Ling
DUAN Wei
CHENG Jie-shan
LI Shao-hua
WANG Li-jun
LIU Guo-jie
Abstract：Experiment was conducted with the young plants of Jingxiu grape cultivar for studying whether the salicylic acid could reduce the photoinhibition of heat stress on photosystem Ⅱ (PS Ⅱ ) of grape leaves. The grape plants sprayed with 0.1 mmol·L~(-1) SA were treated by heat stress (43 ℃) for 5 h, then were let it recovering for 4 d under normal temperature (25 ℃). The chlorophyll fluorescence was measured with a Pulse-modulated Fluorometer (FMS-2) and a Plant Efficiency Analyzer (PEA). The results indicated that SA pretreatment did not alleviate the harm of PSII when grape leaves were under heat stress, but promoted the recovery of acceptor side, donor side and reaction center of PSII from stress to normal status more rapidly compared with the control (spraying water). SA could mitigate the harm of heat stress to grape leaves through promotion of PS II functions to recover more rapidly.
Keywords：Grape leavesHeat stressPS Ⅱ acceptor sidePS Ⅱ donor sidePS Ⅱ reaction centor
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 623-627 )