Overexpression of Rice Monogalactosyldiacylglycerol Synthase OsMGD Leads to Enhanced Salt Tolerance in Rice

Monogalactosyldiacylglycerol (MGDG) is the most abundant lipid on earth and constitutes about 50% of polar lipids in thylakoid membrane higher plants. MGDG synthase (MGD) key enzyme responsible for synthesis However, so far, function MGD gene plant stress responses still unknown, especially crop In this study, performances wild-type rice (Oryza sativa L. Nipponbare), OsMGD overexpression, RNA interference lines were analyzed under salt to clarify role stress. The results showed that, after 6 days NaCl treatment, OsMGD-overexpressing seedlings had biomass than rice, with significantly lower Na+ content K+ ratio shoots. Meanwhile, overexpression a significant increase contents chlorophyll carotenoid photosynthetic capabilities, including net rate, maximal quantum yield (Fv/Fm), effective PSII (ΦPSII), electron transport rate (ETR), coefficient photochemical quenching (qP), compared line. Also, contained 18:3 unsaturated fatty acid levels These indicate that participates regulation improving tolerance through protecting capabilities ion balance rice.