Hydrogen Peroxide Mediates Premature Senescence Caused by Darkness and Inorganic Nitrogen Starvation in Physcomitrium patens.

ABSTRACT: Leaf senescence accompanied by yellowing and Rubisco degradation occurs prematurely in response to various stresses. However, signaling pathways between stress perception and senescence responses are not understood fully, although previous studies suggest the involvement of reactive oxygen species (ROS). While investigating the physiological functions of autophagy in Physcomitrium patens using wild-type (WT) and autophagy-deficient atg5 strains, we found that Physcomitrium colonies senesce prematurely under dark or nitrogen-deficient conditions, with atg5 senescing earlier than WT. In the present study, we measured cellular H2O2, and examined whether H2O2 mediates premature senescence in Physcomitrium colonies. Methyl viologen, an ROS generator, increased cellular H2O2 levels and caused se

SUBMITTER: Roni MS 

PROVIDER: S-EPMC9460043 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature