[NaCl stress increases the heat tolerance of PSII in leaves of rumex K-1 seedlings].
By measuring chlorophyll fluorescence, the effects of NaCl treatment on the maximal efficiency and heat tolerance of PSII were examined in leaves of Rumex seedlings. NaCl 200 mmol/L treatment had no effect on the maximal efficiency of PSII, but increased the heat tolerance of PSII in Rumex leaves. Compared with control leaves, the heat stress-induced decrease in F(v)/F(m) and the increase in F(k)/F(j) ratio were less in NaCl-treated leaves. In addition, the heat stress-induced decrease in photochemical quenching (q(P)), the efficiency of excitation energy capture by open PSII reaction center (F(v)' /F(m)') and the quantum yield of electron transport (PhiPSII) were less in NaCl-treated leaves. Moreover, the increase in the Q(B)-non-reducing PSII reaction center content was less in NaCl-treated leaves than in control leaves. Discussion was made on the possible mechanisms of the increase in the heat tolerance of PSII in NaCl-treated leaves.
Chen
Hua-Xin
HX
College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.
An
Sha-Zhou
SZ
Li
Wei-Jun
WJ
Gao
Hui-Yuan
HY
D006358:Hot Temperature; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D018515:Plant Leaves / Q000502:physiology*; D031804:Rumex / Q000502:physiology*; D036226:Seedlings / Q000502:physiology*; D012965:Sodium Chloride / Q000494:pharmacology*
D045332:Photosystem II Protein Complex; D012965:Sodium Chloride