Effect of potassium deficiency on antioxidant status and cadmium toxicity in rice seedlings

Botanical Studies
Chun-Hsin LiuChing Huei Kao

Abstract

Cadmium (Cd) is one of the most toxic heavy metals and inhibits physiological processes of plants. Potassium (K) is an essential macronutrient in plants. K deficiency and Cd stress represent two different abiotic stress conditions that occur in the field simultaneously. In this study, effects of K deficiency on antioxidant status and Cd toxicity in rice seedlings were investigated. K deficiency significantly decreased K concentration in shoots and roots. However, fresh weight and dry weight of rice seedlings were not affected by K deficiency. The activities of antioxidant enzymes (superoxide dismutase, ascorbate peroxidase, glutathione reductase, and catalase) in K-deficient leaves were higher than respective control leaves. However, K deficiency had no effect on the content of antioxidants (ascorbate and glutathione). Cd toxicity was judged by the decrease in biomass production, chlorosis, and induction of oxidative stress. Based on these criteria, we demonstrated that K deficiency protected rice seedling from Cd stress. Moreover, chlorophyll concentration was higher in K-deficient shoots and roots than their respective control shoots and roots. Our results indicated that K deficiency protects rice seedlings from Cd toxicity. ...Continue Reading

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Citations

Jan 22, 2021·Journal of the Science of Food and Agriculture·Sopanat SawatdeeAdrian E Flood

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Methods Mentioned

BETA
MDA
AsA

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