Abstract
Monogalactosyldiacylglycerol(MGDG) is a main component of the thylakoid membrane. In Arabidopsis thaliana, there are two types of MGDG synthases, type A and B. Under phosphate-limited growth conditions, amounts of phospholipids in extraplastidic membranes are decreased, whereas galactolipids produced by type B MGDG synthases substitute for phospholipids outside plastids. Type A MGDG synthase, MGD1, contributes to synthesis of the bulk of MGDG under normal growth conditions, but functions of MGD1 under stress conditions remained unknown.
There are microarray data sets indicating increases of MGD1 gene expression in response to high salinity, drought, and wounding stresses. Thus, we analyzed in detail the MGD1 expression levels after exogenous abscisic acid(ABA) treatment and under those three stresses by quantitative RT-PCR. MGD1 expression levels were increased after salt and wounding stresses, but unchanged during ABA treatment and drought stress. In this presentation, we will discuss a role of MGD1 in the stress response mechanisms.
