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expand all sections collapse all sections Oryza sativa gene "APO1" (GR:0060058)
Species Oryza sativa (Rice) [ GR_tax:013681 ]
Accession GR:0060058
Gene Symbol APO1
Gene Name ABERRANT PANICLE ORGANIZATION 1 
Synonyms (4)
E.C. Numbers (0)
Pathway Reactions (0)
Gene Type Not sequenced
Has Phenotype yes
Description Panicle architecture and floral organs abnormal. Abnormality first observed was the distichous phyllotaxy of primary branches instead of 2/5 spiral type of wild type. The smaller rachis meristem may cause the change in phyllotaxy. The apo1 mutants had a reduced (apo1.1, apo1.2) or comparable (apo1.3) number of primary branches. Also, most (apo1.1, apo1.2) or (apo1.3) rachis meristems were converted to spikelet meristems. Each primary branch was shorter because of precocious transformation of the apical branch meristems into spikelets, resulting in less than half the number of spikelets and secondary branches of wild type. Shortening of primary branches was more pronounced acropetally. In several apical branches, the branch meristem was converted to spikelet meristem immediately after initiation, resulting in branches with only one terminal spikelet that lack lateral organs. The phenotypes of rachis and branches also showed that the meristem identities of rachis and branches were precociously converted to those of the advanced stages, suggesting that APO1 regulates the temporal maturation of reproductive meristems. The apo1 mutants also had abnormal floral organization, mainly in the number of floral organs. In the apo1, lodicules increased to three or four at the expense of the stamens, conserving the total number of organs in lodicule and stamen whorls of about eight. In the stamen whorl, anther may form on lodicule. Thus, in apo1, the meristem at lodicule-differentiation stage is temporally extended to the stamen-differentiation stage. Carpels increased to two in apo1-3 or to more than 5 in apo1-1 and apo1-2, showing loss of determinacy of floral meristem. In apo1, one or two organs in which stigmatic papillae formed on glume-like tissue were produced inside the stamen whorl.
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