Abstract: A dwarf mutant ddu1 was originally identified from a japonica cultivar Lansheng by ethyl methanesulfonate（EMS） treatment. The elongation of the second leaf sheath in response to GA3 treatment and αamylase induction in embryoless half seeds suggested the dwarfism was not the mutation of GA biosynthesis and signal transduction. Reciprocal cross with Minghui 63, Zhefu 802 and Nipponbare were made to establish genetic population and genetic analysis showed that the mutant was controlled by a single recessive gene. Allelic test indicated that it was not allelic with d1, d18, eui1 and eui2. The marker RM427 linked to ddu1 was obtained by the SSR and STS molecular marker screening and the gene was finally located between the STS molecular markers R5309 and R3742 with the distances of 0.4 and 2.0 cM respectively in 475 kb on chromosome 7.
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