期刊
PHOTOSYNTHETICA
卷 43, 期 3, 页码 473-476出版社
ACAD SCI CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-005-0076-0
关键词
cross stress of heat and high irradiance; ethyleneglycol-di(2-aminoethylether)-tetraacetic acid; lanthanum (III) chloride; photosynthesis; Triticum
Cross stress of heat and high irradiance (HI) resulted in the accumulation of active oxygen species and photo-oxidative damage to photosynthetic apparatus of wheat leaves during grain development. Pre-treatment with calcium ion protected the photosynthetic system from oxidative damage by reducing O-2(-) production, inhibiting lipid peroxidation, and retarding electrolyte leakage from cell. Therefore, high F-v/F-m, [maximal photochemical efficiency of photosystem 2 (PS2) while all PS2 reaction centres are open], F-m/F-0 (another expression for the maximal photochemical efficiency of PS2), (Phi(PS2) (actual quantum yield of PS2 under actinic irradiation), q(P) (photochemical quenching coefficient), and P-N (net photosynthetic rate) were maintained, and lower q(NP) (non-photochemical quenching coefficient) of the leaves was kept under heat and HI stress. EGTA (a chelant of calcium ion) and LaCl3 (a blocker of Ca2+ channel in cytoplasmic membrane) had the opposite effect. Thus Ca ion may help protect the photosynthetic system of wheat leaves from oxidative damage induced by the cross stress of heat and HI.
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