Os01g0293000

OsSAMS1, 2 and 3 are essential for histone H3K4me3 and DNA methylation to regulate gene expression related to flowering in Oryza sativa.

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OsSAMS1, 2 and 3 are essential for histone H3K4me3 and DNA methylation to regulate gene expression related to flowering in Oryza sativa.
RNA interference (RNAi) transgenic rice with downregulated transcripts of OsSAMS1, 2 and 3 showed pleiotropic phenotypes, including dwarfism, reduced fertility, delayed germination, as well as late flowering. Delayed germination was largely rescued by application of SAM in the knockdown lines.

OsSAMS1 was expressed abundantly in almost every tissue. By contrast, the expression of OsSAMS3 was weak compared with OsSAMS1(Fig. 1A).Thus, OsSAMS genes were constitutively expressed but the various homologues may have different functions during development.The double mutant containing OsSAMS1 or 2, or 3 alone no longer depended on externally added SAM when their expression was induced in the presence of galactose (Fig. 1B). Thus, OsSAMS1, 2 and 3 were all genetically complemented for the functional SAMS enzyme in the yeast double mutant in vivo. Moreover, as shown in Fig. 1B, the OsSAMS1 activity was comparable to OsSAMS2, and OsSAMS3 activity was weak.

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Research Center for Molecular and Developmental Biology, Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
National Plant Gene Research Center, Beijing 100093, China
Key Laboratory of Molecular Biology, College of Heilongjiang Province, Heilongjiang University, Harbin 150080, China

Baurle I, Dean C. The timing of developmental transitions in plants. Cell 2006;125:655–64.