Disruption of the Vacuolar Calcium-ATPases in Arabidopsis Results in the Activation of a Salicylic Acid-Dependent Programmed Cell Death Pathwayopen access
- Authors
- Boursiac, Yann; Lee, Sang Min; Romanowsky, Shawn; Blank, Robert; Sladek, Chris; Chung, Woo Sik; Harper, Jeffrey F.
- Issue Date
- Nov-2010
- Publisher
- OXFORD UNIV PRESS INC
- Citation
- PLANT PHYSIOLOGY, v.154, no.3, pp.1158 - 1171
- Indexed
- SCIE
SCOPUS
- Journal Title
- PLANT PHYSIOLOGY
- Volume
- 154
- Number
- 3
- Start Page
- 1158
- End Page
- 1171
- URI
- https://scholarworks.bwise.kr/gnu/handle/sw.gnu/24888
- DOI
- 10.1104/pp.110.159038
- ISSN
- 0032-0889
- Abstract
- Calcium (Ca2+) signals regulate many aspects of plant development, including a programmed cell death pathway that protects plants from pathogens (hypersensitive response). Cytosolic Ca2+ signals result from a combined action of Ca2+ influx through channels and Ca2+ efflux through pumps and cotransporters. Plants utilize calmodulin-activated Ca2+ pumps (autoinhibited Ca2+-ATPase [ACA]) at the plasma membrane, endoplasmic reticulum, and vacuole. Here, we show that a double knockout mutation of the vacuolar Ca2+ pumps ACA4 and ACA11 in Arabidopsis (Arabidopsis thaliana) results in a high frequency of hypersensitive response-like lesions. The appearance of macrolesions could be suppressed by growing plants with increased levels (greater than 15 mM) of various anions, providing a method for conditional suppression. By removing plants from a conditional suppression, lesion initials were found to originate primarily in leaf mesophyll cells, as detected by aniline blue staining. Initiation and spread of lesions could also be suppressed by disrupting the production or accumulation of salicylic acid (SA), as shown by combining aca4/11 mutations with a sid2 (for salicylic acid induction-deficient2) mutation or expression of the SA degradation enzyme NahG. This indicates that the loss of the vacuolar Ca2+ pumps by itself does not cause a catastrophic defect in ion homeostasis but rather potentiates the activation of a SA-dependent programmed cell death pathway. Together, these results provide evidence linking the activity of the vacuolar Ca2+ pumps to the control of a SA-dependent programmed cell death pathway in plants.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - ETC > Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.