EFFECTS OF POTASSIUM DEFICIENCY AND REPLACEMENT OF POTASSIUM BY SODIUM ON SUGAR BEET PLANTS

文献类型： 外文期刊

第一作者： Pi, Z.

作者： Pi, Z.;Yv, L. H.;Geng, G.;Guo, X. L.;Yang, Y.;Peng, C. X.;Kong, X. S.;Stevanato, P.;Yv, L. H.;Geng, G.

作者机构：

关键词： Beta vulgaris;potassium-sodium replacement;potassium deficiency;sugar beet;antioxidant enzymes;free amino acids

期刊名称：RUSSIAN JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：1.481； 五年影响因子：1.608 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Two sugar beet (Beta vulgaris L.) genotypes were cultivated at different K+/Na+ concentration nutrient solutions (mM, 3.00/0 (control groups), 0.03/2.97 (K-Na replacement groups), and 0.03/0 (K deficiency groups)) to investigate the effects of potassium deficiency and replacement of potassium by sodium on plant growth and to explore how sodium can compensate for a lack of potassium. After 22 days of growth were determined: (i) dry weights of leaves, stems, and roots, (ii) the Na+ and K+ contents, (iii) MDA level, (iv) the activities of antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPX), and (v) the level of free amino acids. Potassium deficit inhibited plant growth, decreased the K+ content inleaves and roots, activated GPX and SOD, suppressed CAT activity, and increased the content of most amino acids. In K-Na replacement groups, the effects of K+ deficiency, including changes in the MDA level, antioxidant enzyme activities, and the level of free amino acids, were alleviated, but the degree of recovery did not reach the values characteristic for the control groups. Based on these results, we concluded that low potassium could lead to the inhibition of seedling growth, oxidative damage, andamino acid accumulation. While sodium was able to substitute potassium to a large extent, it cannot fulfil potassium fundamental role as an essential nutrient in sugar beet.

分类号： Q94

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