期刊
GENES & GENETIC SYSTEMS
卷 81, 期 3, 页码 171-180出版社
GENETICS SOC JAPAN
DOI: 10.1266/ggs.81.171
关键词
cell proliferation; development of panicles; GAST (Gibberellin stimulated transcript); Gibberellin; rice (Oryza sativa L.Nipponbare)
Two different types of genes for rice GA-stimulated transcript (GAST) homologue genes, Oryza sativa GA-stimulated transcript-related gene 1 (OsGASR1) and gene 2 (OsGASR2), were found. Both OsGASR proteins contain a cysteine-rich domain highly conserved among GAST family proteins in their C-terminal regions. Gibberellin A(3) (GA(3)) stimulated expression of both OsGASRs in the wild-type Nipponbare and GA(3) synthesis-deficient mutant. Expression of both OsGASRs apparently increased when cell proliferation entered the logarithmic phase, and rapidly reduced when cell proliferation was temporarily halted. RTPCR analysis indicated different expression patterns of these genes in developing panicles. OsGASR1 was limitedly but strongly expressed in florets while OsGASR2 was expressed in both florets and branches. In situ hybridization showed that they were strongly expressed in the root apical meristem (RAM) and shoot apical meristem (SAM), but little signals were detected in mature leaves. Transient expression of OsGASR-GFP fusion proteins in onion epidermal cells revealed that both OsGASR proteins localized to the apoplasm or cell wall. These results suggest that OsGASR1 and OsGASR2 were involved in cell division and might play diverse roles in differentation of panicles.
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