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The Arabidopsis cax3 mutants display altered salt tolerance, pH sensitivity and reduced plasma membrane H+-ATPase activity
Planta
  • Jian Zhao, Baylor College of Medicine
  • Bronwyn J Barkla, Instituto de Biotecnolog√≠a/UNAM
  • Joy Marshall, Prairie View A&M University
  • Jon K Pittman, University of Manchester
  • Kendal D Hirschi, Texas A & M University
Document Type
Article
Publication Date
1-1-2008
Peer Reviewed
Peer-Reviewed
Abstract
Perturbing CAX1, an Arabidopsis vacuolar H+/Ca2+ antiporter, and the related vacuolar transporter CAX3, has been previously shown to cause severe growth defects; however, the specific function of CAX3 has remained elusive. Here, we describe plant phenotypes that are shared among cax1 and cax3 including an increased sensitivity to both abscisic acid (ABA) and sugar during germination, and an increased tolerance to ethylene during early seedling development. We have also identified phenotypes unique to cax3, namely salt, lithium and low pH sensitivity. We used biochemical measurements to ascribe these cax3 sensitivities to a reduction in vacuolar H+/Ca2+ transport during salt stress and decreased plasma membrane H+-ATPase activity. These findings catalog an array of CAX phenotypes and assign a specific role for CAX3 in response to salt tolerance.
Disciplines
Citation Information

Zhao, J, Barkla, BL, Marshall, J, Pittman, JK & Hirschi, KD 2008, 'The Arabidopsis cax3 mutants display altered salt tolerance, pH sensitivity and reduced plasma membrane H+-ATPase activity', Planta, vol. 227, no. 3, pp. 659-669.

Published version available from:

http://doi.org/10.1007/s00425-007-0648-2