Authors: Yanhua Qi Yasuo Yamauchi Jianqun Ling Naoyoshi Kawano Debao Li Kiyoshi Tanaka
Publish Date: 2004/04/16
Volume: 219, Issue: 3, Pages: 450-458
Abstract
Suppression subtractive hybridization was used to construct a subtractive cDNA library from plants of nonsubmerged and 7daysubmerged rice Oryza sativa L FR13A a submergencetolerant cultivar One clone of the subtractive cDNA library S23 was expressed abundantly during submergence The full length of S23 was amplified using 5′ and 3′rapid amplification of cDNA ends and found to consist of 1671 bp with an open reading frame of 1077 bp 181–1257 encoding 358 amino acids Its deduced amino acid sequence showed a high homology with monogalactosyldiacylglycerol synthase UDPgalactose 12diacylglycerol 3βdgalactosyl transferase EC 24146 MGDG synthase from Arabidopsis thaliana therefore we named the gene OsMGD Timecourse studies showed that the expression of OsMGD in the rice cultivars FR13A and IR42 submergencesusceptive cultivar during submergence was gradually increased and that expression in FR13A was higher than in IR42 The expression of OsMGD in FR13A was influenced by benzyladenine and illumination The accumulation of OsMGD mRNA in both FR13A and IR42 was also increased by ethephon gibberellin drought and salt treatment but cold stress had no effect on the expression of the gene These results suggest that the expression of OsMGD mRNA requires benzyladenine or illumination and that the process is also mediated by ethephon and gibberellin Salt and drought stress have an effect similar to that of submergence Furthermore the enhanced expression of OsMGD may relate to photosynthesis and play an important role during submergence
Keywords: