Inhibition of ABA-induced stomatal closure by fusicoccin is associated with cytosolic acidification-mediated hydrogen peroxide removal.

ABSTRACT:

Background

Fusicoccin (FC), a fungal phytotoxin produced by Fusicoccum amygdale, causes the inhibition of ABA-induced stomatal closure. The mechanism of inhibition is remaining unclear. We analyzed the role of hydrogen peroxide (H₂O₂) and relationship between H₂O₂ removal and cytosolic pH changes during inhibition of ABA-induced stomatal closure by FC.

Results

According to the results, ABA treatment induced H₂O₂ production and stomatal closure, but FC inhibited the effects of ABA on these two parameters. Treatment with catalase (CAT) and NADPH oxidase inhibitor diphenylene iodonium (DPI) mimicked the effect of FC. These data suggest that inhibition of ABA effect by FC is related to the decrease of H₂

SUBMITTER: Huang AX 

PROVIDER: S-EPMC5432956 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature