DOI: 10.3724/SP.J.1006.2018.00169

Acta Agronomica Sinica (作物学报) 2018/44:2 PP.169-176

Identification and Gene Mapping of a Floral Organ Number Mutant mf2 in Rice (Oryza sativa)

A rice floral organ mutant mf2 (multi-floret 2) was identified from Hanghui 7, an indica restorer line in rice (Oryza sativa L.), which was treated with heavy ion irradiation. The glumes, lodicules, stamens, pistil of the mutant increased, and most of the spikelets had 2-3 flowers. The palea and lemma of mf2 mutant were dehiscent, the shape and number of vascular bundles were different from those of the wild-type. Scanning electron microscope analysis revealed that the flowers variation of mf2 had been formed in the differentiation of the primordium during the spike differentiation stage. The heading date of the mf2 mutant was delayed, the plant height was decreased, but the number of panicles was increased, showing that the vegetative growth of the mutant was also affected. Genetic analysis showed that the mf2 mutant phenotype was controlled by a recessive nuclear gene. There are 321 recessive individuals from the F2 segregation population were used to fine map MF2. Finally, MF2 was located in a 102 kb physical interval between markers SSR39108 and InDel39210 on chromosome 1.

Key words:rice (Oryza sativa L.),heavy ion mutagenesis,floral mutants,gene mapping

ReleaseDate:2018-03-08 10:13:38

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