[Effects of salicylic acid on D1 protein phosphorylation and PS II performance in wheat leaf chloroplasts under high temperature and high light stress].
To study the effects of salicylic acid (SA) on the D1 protein phosphorylation and PS II performance in wheat (Tritivum aestivum L.) leaf chloroplasts under high temperature and high light, the wheat leaves at grain-filling stage were sprayed with SA solution (0.5 mmol x L(-1)) or water (as control), and then subjected to 35 degrees C and 1600 micromol x m(-2) x s(-1) for various hours. The changes in electron transport rate (ETR), net photosynthetic rate, chlorophyll fluorescence parameters, and relative amount of phosphorylated and nonphosphorylated D1 protein in thylakoid membrane were compared. The results showed that foliar spraying SA effectively inhibited the degradation of D1 protein under high temperature and high light stress, and maintained the D1 protein phosphorylation, ETR of whole chain and PS II, Fv/Fm (the maximal photochemical efficiency of PS II), phi(PS II) (the actual photochemical efficiency of PS II), q(p)(the photochemical quenching coefficient), and Pn (net photosynthetic rate) at a higher level, indicating that exogenous SA could mitigate the damage effect of high temperature and high light on wheat leaf photosynthetic apparatus and benefit PS II performance via regulating the turnover of D1 protein in chloroplasts.
Ma
Pei-Fang
PF
College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China. mapeifang004@163.com
Li
Li-hong
LH
Yang
Ya-jun
YJ
Zhao
Hui-jie
HJ
Fu
Xiao-ji
XJ
Zhang
Chao-nan
CN
D002736:Chloroplasts / Q000737:chemistry*; D006358:Hot Temperature; D010766:Phosphorylation; D045332:Photosystem II Protein Complex / Q000737:chemistry*; D018515:Plant Leaves / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology*; D013472:Sunlight; D014908:Triticum / Q000378:metabolism / Q000502:physiology*
D045332:Photosystem II Protein Complex; D020156:Salicylic Acid