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Effects of deoxynivalenol on activity of K~(+)-stimulated root PM ATPase, and uptake, leakage and allocation of K~(+)in wheat seedlings

Yao Quanhong, Huang Xiaomin, Liu Zongzhen, Kang Yao

Shanghai Academy of Agricultural Sciences. Shanghai 201106

Abstract

When Fusarium toxin deoxynivalenol (DON) was added to a concentration of 10~(-8)mol/L into plasmalemma--enriched preparation of wheat root, the K~(+ )--stimulated ATPase activity was increased. However, when the DON concentration was raised to 10~(-6)mol/L, inhibition occurred and its extent increased with the increase of DON concentration. the K~(+)uptake of 5cm segments from root tip was enhanced by 10~(-8)mol/L DON, but lowered by a DON concentration higher than 10~(-6)mol/L. the net uptake was negative in 10~(-2)mol/L DON, implying that K~(+)was leaked from wheat root. K~(+)leakage was observed in wheat root segment treated with 4mmol/L DON. 0.25---6.0mmol/L DON could stimulate K~(+)allocation from、other parts of wheat plant to the part treated with DON. The K~(+)accumulation was inhibited in 8mmol/L DON and root suffered a net loss of K~(+).

Key words: K~(+)-stimulated ATPase;K~(+) uptake;K~(+) leakage;Deoxynivalenol;Wheat

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Citing This Article：

Yao Quanhong, Huang Xiaomin, Liu Zongzhen, Kang Yao. Effects of deoxynivalenol on activity of K~(+)-stimulated root PM ATPase, and uptake, leakage and allocation of K~(+)in wheat seedlings. Acta Physiol Sin 1995; 47 (1): (in Chinese with English abstract).