Abstract
We have recently been reporting that glutathione (GSH), an abundant antioxidant, regulates many physiological events in plants [Ogawa (2005) Antioxid. Redox Signal. 7: 973-981]. Since most of the events that are governed by GSH cannot be controlled by other thiols, we focused on and studied the physiological function of proteins undergoing glutathionylation (covalent biding of the GSH moiety through the disulfide bride). Here I will present a talk showing that one of proteins undergoing glutathionylation in chloroplasts plays a key role in plant growth and pathogen-related response and that glutathionylation determines the function of the protein. Considering that GSH synthesis is strongly dependent on photosynthesis and that plant growth and pathogen-related response are regulated by GSH, it can be concluded that plant growth and pathogen-related response are regulated by photosynthesis via glutathionylation of the single protein.
