Effect of exogenous potassium on photosynthesis and antioxidant enzymes of rice under iron toxicity

• Published in: Russian journal of plant physiology Vol. 61; no. 1; pp. 47 - 52
• Main Authors: Gao, P. P., Zheng, G. H., Wu, Y. H., Liu, P.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.01.2014
• Subjects: Biomedical and Life Sciences; chlorophyll; fluorescence; genotype; iron; Life Sciences; Oryza sativa; photosynthesis; Plant Physiology; Plant Sciences; potassium; Research Papers; rice; superoxide dismutase; toxicity; toxicity testing; potassium; oxidation resistance; chlorophyll fluorescence; iron stress
• ISSN: 1021-4437; 1608-3407
• DOI: 10.1134/S1021443714010051

A solution culture experiment was conducted to determine the effects of different potassium concentrations on the chlorophyll fluorescence and oxidation resistance of the Fe 2+ -tolerant rice ( Oryza sativa L.) genotype Xieyou 9308 and the Fe 2+ -sensitive genotype IIyou 838 exposed to 250 mg/L of Fe 2+ . The minimal fluorescence, maximum fluorescence efficiency, maximum fluorescence, and non-photochemical quenching coefficient showed no significant changes. However, the photochemical quenching coefficient increased. Under 200 mg/L K + concentration, the effects of Fe 2+ stress decreased. Compared with the control group, chlorophyll content and peroxidase, superoxide dismutase, and catalase activities decreased, whereas MDA content increased under Fe 2+ stress. Exogenous K + alleviated Fe 2+ toxicity in the test subjects compared with the control group. Overall, external K + could alleviate the toxic effects of Fe 2+ toxicity.