Characterization of PSII photochemistry and thermostability in salt-treated Rumex leaves.
A study was conducted, using chlorophyll fluorescence, rapid fluorescence induction kinetics, and polyphasic fluorescence transients, to determine the effect of salt treatment and heat stress on PSII photochemistry in Rumex leaves. Salt treatment was accomplished by adding NaCl solutions of different concentrations ranging from 50 to 200 mmol/L. Heat stress was induced by exposing the plant leaves to temperatures ranging from 29 to 47 degrees C. The control plants were grown without NaCl treatment. The data acquired in this study showed that NaCl treatment alone had no effect on the maximal photochemistry of PSH or the polyphasic rise of chlorophyll fluorescence. However, the NaCl treatment modified heat stress on PSII photochemistry in Rumex leaves, which was manifested by a lesser heat-induced decrease in photochemical quenching (qP), efficiency of excitation energy capture by open PSII reaction centers (Fv'/Fm'), and quantum yield of PSII electron transport (phiPSII). The data also showed that NaCl treatment compromised the impact of heat stress on the capacity of transferring electrons from Q(A)- to Q(B). Furthermore, the NaCl treatment promoted heat resistance of O2-evolving complex (OEC). In summary, NaCl treatment enhanced the thermostability of PSII.
Chen
Hua-Xin
HX
Department of Plant Science, Shandong Agricultural University, Taian, Shandong, 271018, PR China.
Li
Wei-Jun
WJ
An
Sha-Zhou
SZ
Gao
Hui-Yuan
HY
D002734:Chlorophyll / Q000378:metabolism; D004355:Drug Stability; D004579:Electron Transport / Q000187:drug effects; D005453:Fluorescence; D006358:Hot Temperature; D010777:Photochemistry; D045332:Photosystem II Protein Complex / Q000737:chemistry / Q000378:metabolism*; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D031804:Rumex / Q000187:drug effects* / Q000378:metabolism*; D012965:Sodium Chloride / Q000494:pharmacology*; D014867:Water / Q000378:metabolism
D045332:Photosystem II Protein Complex; D014867:Water; D002734:Chlorophyll; D012965:Sodium Chloride