부산대학교 도서관

Abstract??The shoot apical meristem (SAM) produces lateral organs in a regular spacing (phyllotaxy) and at a regular interval (phyllochron) during the vegetative phase. In aDissociation(Ds) insertion rice population, we identified a mutant,compact shoot and leafy head 1(csl1), which produced massive number of leaves (?70) during the vegetative phase. Incsl1, the transition from the vegetative to the reproductive phase was delayed by about 2 months under long-day conditions. With a reduced leaf size and severe dwarfism,csl1failed to produce a normal panicle after the transition to reproductive growth. Instead, it produced a leafy panicle, in which all primary rachis-branches were converted to vegetative shoots. Phenotypicallycsl1resembledplamutants in short plastochron but was more severe in the conversion of the reproductive organs to vegetative organs. In addition, neither the expression nor the coding region ofPLA1orPLA2was affected incsl1.csl1is most likely a dominant mutation because no mutant segregant was observed in progeny of 67 siblings of thecsl1mutant.CSL1may represent a novel gene, which functions downstream ofPLA1and/orPLA2, or alternatively functions in a separate pathway, involved in the regulation of leaf initiation and developmental transition via plant hormones or other mobile signals. [ABSTRACT FROM AUTHOR]