Biologia Plantarum

, 51:229

Effects of freezing on plasma membrane H+-ATPase of the callus from Chorispora bungeana

  • J. M. Wu
  • Z. G. Zhao
  • H. Xing
  • H. P. Guo
  • W. X. Li
  • L. Z. An
  • S. J. Xu
  • T. Chen
Original Papers

DOI: 10.1007/s10535-007-0046-4

Cite this article as:
Wu, J.M., Zhao, Z.G., Xing, H. et al. Biol Plant (2007) 51: 229. doi:10.1007/s10535-007-0046-4

Abstract

The influence of freezing treatment on plasma membrane (PM) H+-ATPase was investigated using plasma membrane vesicles isolated from calluses from Chorispora bungeana Fisch. & C.A. Mey. by the discontinuous sucrose gradient centrifugation. Freezing treatment (−4 °C) for 5 d resulted in significant increases in the ATPase activity and the activity of p-nitrophenyl phosphate (PNPP) hydrolysis, decreases in the Km for ATP hydrolysis and PNPP hydrolysis, and the shift of optimal pH from 6.5 to 7.0. Also, the activity PNPP hydrolysis was less sensitive to vanadate after freezing treatment compared to control, while the inhibition of ATP hydrolysis by hydroxylamine was more sensitive. In addition, freezing treatment also decreased the activation effects of trypsin on PNPP hydrolysis, but increased the activation effects of lysophosphatidylcholine on ATP hydrolysis. Taken together, these results suggested that PM H+-ATPase might play an important role during adaptation to freezing and enhancing the frost hardness in C. bungeana.

Additional key words

alpine plant kinase domain p-nitrophenyl phosphate phosphatase domain 

Abbreviations

ATP

adenosine triphosphate

BSA

bovine serum albumin

DTT

dithiothreitol

EDTA

ethylenediaminetetraacetic acid

lyso-PC

lysophosphatidylcholine

Mes

2-(N-morpholino)-ethanesulfonic acid

PM

plasma membrane

PMSF

phenylmethylsulfonyl fluoride

PNPP

p-nitrophenyl phosphate

Tris

N-tris(hydroxymethyl)-amino methane

Copyright information

© Institute of Experimental Botany, ASCR 2007

Authors and Affiliations

  • J. M. Wu
    • 1
  • Z. G. Zhao
    • 1
  • H. Xing
    • 3
  • H. P. Guo
    • 1
  • W. X. Li
    • 1
  • L. Z. An
    • 1
    • 2
  • S. J. Xu
    • 1
  • T. Chen
    • 2
  1. 1.Key Laboratory of Arid and Pasture Agroecology of Ministry of EducationLanzhou UniversityLanzhouP.R. China
  2. 2.Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of ScienceLanzhouP.R. China
  3. 3.College of AgronomyGansu Agriculture UniversityLanzhouP.R. China

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