Os06g0665400
The rice gene Os06g0665400 was reported as apo1 in 2007[1] by researchers from Japan.
Contents
Annotated Information
Gene Symbol
- Os06g0665400 <=> apo1(t), apo1, SCM2, SCM2/APO1, OsFbox321, Os_F0393
Function
- APO1 positively controls spikelet number by suppressing the precocious conversion of inflorescence meristems to spikelet meristems. In addition, APO1 is associated with the regulation of the plastchron, floral organ identity, and floral determinacy.
- APO1 positively regulates class-C floral homeotic genes, but not class-B genes.
- Molecular studies revealed that APO1 encodes an F-box protein, an ortholog of Arabidopsis UNUSUAL FLORAL ORGAN (UFO), which is a positive regulator of class-B genes.
Mutation
Figure 1. Phenotypes of apo1. [1].
- apo1 showed a number of abnormal phenotypes in the vegetative and reproductive phases. During vegetative growth, apo1 plants produced leaves rapidly, resulting in 1.5-fold more leaves than the wild type at the mature stage. In the reproductive phase, apo1 exhibited remarkable phenotypes in both panicle (inflorescence) architecture and floral organ identity (Figure 1a). At the early stage of panicle development primary branch primordia were produced by distichous phyllotaxy, in contrast to 2/5 spiral phyllotaxy in the wild type (Figure 1b,c).
- The apo1 mutation also affected floral organ identities. In apo1 flowers, stamens were frequently replaced with lodicules (petals), and carpels were produced indeterminately (Figure 1d–f).
Expression
- APO1 was expressed in apical meristems and the lateral organ primordia throughout development.
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Labs working on this gene
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
References
