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Plant height is one of the most important agronomic traits, which determines grain yield. By a largescale screening of our mutant population, we identified a dwarf with twisty leaf mutant (dwarf and twist leaf 1, dtl1). Besides dwarf with twisty leaf, dtl1 also showed reduced tiller number and sterile phenotypes. Based on the internode length of dtl1, this mutant belongs to the nl type of dwarfing phenotype. Physiological assay with two phytohormones, gibberellin (GA), and brassinosteroid (BR), suggested that dtl1 was neither deficient nor insensitive to GA and BR. Genetic analysis showed that the phenotype of dtl1 was controlled by a single recessive gene. Using F2 population derived from a cross between dtl1 and an indica cultivar Taichung Native 1, the DTL1 gene was narrowed down to a 70.4 kb between two SSR markers, RM25923 and RM6673, on the long arm of chromosome 10, and co-segregated with InDel marker Z10-29, where thirteen open reading frames were predicted without known gene involved in controlling plant height. Thus, the DTL1 gene might be a novel gene which is related to plant height in rice.

Characterisation of a rice <I>dwarf and twist leaf 1 (dtl1)</I> mutant and fine mapping of <I>DTL1</I> gene