Abstract
Mutant plays an important role in function analysis in plant. A rice flower mutantreproduce organs absent (roa), showing a stable inheritance during several years of study, was identified in rice (Oryza sativa L.ssp. Indica) cultivar Jinhui10 treated with EMS and used in this study. This mutant showed following: elongated palea and pedicle; absence of inner three whorls of floral organs; multi-whorls glume like organs inside the lemma/palea; spikelet meristem like organ upon the pedicle. These phenotypes suggested thatROA is a key gene in rice spikelet development. Genetic analysis confirmed that the mutant traits were controlled by a single recessive nuclear gene. By gene mapping,ROA was restricted between two SSR markers RM221 and RM1342 on the chromosome 2. It concluded thatROA was a novel gene involving in flower development in rice. Besides, the mutation ofROA influenced the transcription level of floral homeotic genes; the expression of floral homeotic genes decreased in roa panicle compared with wild-type, and it suggested thatROA affected flower development by influencing the expression of floral homeotic genes.
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