Expression analysis of genes for callose synthases and Rho-type small GTP-binding proteins that are related to callose synthesis in rice anther.
The most chilling-sensitive stage of rice has been found to be at the onset of microspore release. The microsporocytes produce a wall of callose between the primary cell wall and the plasma membrane, and it has been shown that precise regulation of callose synthesis and degradation in anther is essential for fertile pollen formation. In this study, genes for 10 callose synthases in the rice genome were fully annotated and phylogenetically analyzed. Expression analysis of these genes showed that OsGSL5, an ortholog of microsporogenesis-related AtGSL2, was specifically expressed in anthers, and was notably downregulated by cooling treatment. Gene expression profiles of Rho-type small GTP-binding proteins in rice anther were also analyzed. The mechanisms of callose synthesis in rice pollen formation and its relationships with cool tolerance are discussed.
Plant Physiology Laboratory, National Agricultural Research Center for Tohoku Region, Morioka, Japan. tomyamag@affrc.go.jp
Tomoya
T
Yamaguchi
Takami
T
Hayashi
Katsuhiro
K
Nakayama
Setsuo
S
Koike
D002462:Cell Membrane / Q000201:enzymology; D004272:DNA, Mitochondrial / Q000235:genetics; D020869:Gene Expression Profiling; D015971:Gene Expression Regulation, Enzymologic / Q000235:genetics; D018506:Gene Expression Regulation, Plant / Q000235:genetics*; D018745:Genome, Plant / Q000235:genetics; D005964:Glucosyltransferases / Q000235:genetics* / Q000378:metabolism; D012275:Oryza / Q000201:enzymology* / Q000235:genetics*; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics; D020741:rho GTP-Binding Proteins / Q000235:genetics*
D004272:DNA, Mitochondrial; D012333:RNA, Messenger; D005964:Glucosyltransferases; C020570:1,3-beta-glucan synthase; D020741:rho GTP-Binding Proteins