Abstract
Three new genes induced by flash flood were cloned from flash flood-tolerant rice cultivars and their full length cDNA sequences were determined. By homology research, the first is homologous to monogalactosyldiacylglycerol synthase (MGDGS), the second to glycogenin glucosyltransferase (glycogenin) and the third to cation transport protein ChaC (CTP). The expressions of their genes were increased in response to flash flood, drought, high salt, ethylene, abscisic acid and gibberellin, but methyljasmonic acid and cold stress had no effect on their expressions. Among these three genes, the expressions of MGDGS and CTP gens were increased by flash flood not only in flash flood-tolerant rice cultivar but also in flash flood- sensitive one. However, the expression of glycogenin gene was increased in response to flash flood only in flash flood-tolerant cultivar. The flash flood-tolerance of rice may relateto the capacity for polysaccharide synthesis.
