Low antioxidant concentrations impact on multiple signalling pathways in Arabidopsis thaliana partly through NPR1.

ABSTRACT: Production of reactive oxygen species (ROS) is linked to signalling in both developmental and stress responses. The level of ROS is controlled by both production and removal through various scavengers including ascorbic acid and glutathione. Here, the role of low ascorbic acid or glutathione concentrations was investigated on ozone-induced cell death, defence signalling, and developmental responses. Low ascorbic acid concentrations in vtc1 activated expression of salicylic acid (SA)-regulated genes, a response found to be dependent on the redox-regulated transcriptional co-regulator NPR1. In contrast, low glutathione concentrations in cad2 or pad2 reduced expression of SA-regulated genes. Testing different responses to jasmonic acid (JA) revealed the presence of at least two separate JA si

SUBMITTER: Brosche M 

PROVIDER: S-EPMC3295383 | biostudies-literature | 2012 Mar

REPOSITORIES: biostudies-literature