Ozone-induced caspase-like activities are dependent on early ion channel regulations and ROS generation inArabidopsis thalianacells

Abstract

Using A. thaliana cultured cells; we recently reported new insights regarding the effect of acute O3 exposure.1-3 This consist in an oxidative dependent controlled cell death process involving cell shrinkage due to an early activation of anion channel1 and a delayed activation of K+ outward currents2, but also to early events like Ca2+ influx or singlet oxygen production possibly linked to mitochondrial dysfunction.1 Here we provide evidence that most of these early events act downstream of caspase-like activities as recently demonstrated for K+ channel activation.2