Effect of Water Stress on Plasma Membrane ATPase Activity of Maize Leaves and Its Relation to Osmoregulation of CaM

doi:10.3321/j.issn:1000-7091.1997.01.007

Abstract

Abstract: The PM ATPase activity of the third maize leaves significantly increased in the three leaves seedlings under 0.5MPa PEG 6000 for 24 hours,and V_max rised almost one time,but K_m decreased.With the development of water stress,proline accumulated, treatment of vanadate, a inhibitor of ATPase,delay proline accumulation 24 hours. Total contents rised,then declined with or without vanadate. These suggested that the start of osmoregulation may be not related with the increasing of ATPase activities. Trifluoperazine,a inhibitor of calmodulin, stimulated calmodulin and inhibited PM ATPase activities. It suggested that ATPase activities may be declined after phosphorylation.

Key words: Maize leaves, Plasma membrane, ATPase, Water stress, Calmodulin, Osmoregulation

CLC Number:

S513.01

Huang Guocun, Zhou Hongxian, Cui Siping, Ma Chunhong, Wei Jiankun. Effect of Water Stress on Plasma Membrane ATPase Activity of Maize Leaves and Its Relation to Osmoregulation of CaM[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1997, 12(1): 30-33. doi: 10.3321/j.issn:1000-7091.1997.01.007.

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