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Characterizations and molecular mapping of a novel dominant semi-dwarf gene Sdd(t) in rice (Oryza sativa)

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Abstract

By nitrogen ion implanting, we obtained a semi-dwarf mutant from a japonica rice cultivar Y98148, designated as Y98149. The genetic analysis of Y98149 indicated that the semi-dwarf phenotype was controlled by a single dominant gene, Sdd(t). We show that Y98149 reduced plant height mainly via inhibiting the first, second and third internode elongation. Based on this dwarfing pattern, the mutant could be grouped into dn-type dwarf defined by Takeda [Gamma Field Symp. (1977) Vol. 16, PP. 1–18] . In addition, the Sdd(t) gene was sensitive to gibberellin (GA) based on the response to extraneous GA3 and the quantitative determination of endogenous GA1 and GA4. To map the Sdd(t) gene, we tested molecular markers by bulk segregant analysis. The Sdd(t) gene was localized to a 6.4 cM-interval on the short arm of chromosome 6, flanked by two sequence-tagged site markers S9 and S13.
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Keywords: Sdd(t) gene; gibberellin; ion beam implantation; mutation

Document Type: Research Article

Affiliations: 1: Key Laboratory of Ion Beam Bioengineering, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2: Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China 3: State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China

Publication date: 01 April 2008

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