K~+ efflux of wheat roots in Tween--20 solutionmay be due to leakage of plasma-membrane. Inhibition of the KCl-stimulatedmembrane-ATPase due to modified lipid environment may be considered as acause of decrease of active transport of K~+.

• Tween-20对膜-ATP酶活力的影响可能是它影响小麦根细胞K~+主动吸收的原因。