从粳稻中花 11转基因后代中发现了一个半矮化小穗突变体，表现为植株半矮化、生长势弱、半包茎穗、穗型变小等特点，将其命名为sdsp2(semidwarf and small panicle 2)。遗传分析显示，该突变体表型受1对隐性核基因控制。以sdsp2突变体为母本与龙特甫B杂交构建F2分离群体，将该基因定位在水稻第6染色体的RH632和RH640之间的116 kb的物理距离内。通过水稻基因组注释系统在此区域预测到14个开放阅读框，未发现与已报道穗型发育相关基因的同源基因。
A semidwarf and small panicle mutant was obtained from a japonica rice variety Zhonghua 11 through TDNA transformation. The mutant, characterized by semidwarf plant, abnormal small and semienclosed panicle, and poor growth potential was designated as sdsp2(semidwarf and small panicle 2). Genetic analysis indicated that the mutant was controlled by a single recessive gene. A genetic linkage map was constructed using an F2 mapping population derived from a cross between the sdsp2 mutant and an indica variety Longtefu B on chromosome 6. The gene was finally located on a 116kb region between the STS markers RH632 and RH640，where 14 ORFs were predicted based on Rice Genome Annotation．
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