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Rice open beak is a negative regulator of class 1 knox genes and a positive regulator of class B floral homeotic gene.
- Source :
-
The Plant journal : for cell and molecular biology [Plant J] 2009 Jun; Vol. 58 (5), pp. 724-36. Date of Electronic Publication: 2009 Feb 04. - Publication Year :
- 2009
-
Abstract
- Numerous genes are involved in the regulation of plant development, including those that regulate floral homeotic genes, We identified two recessive allelic rice mutants, open beak-1 (opb-1) and opb-2, which exhibited pleiotropic defects in leaf morphogenesis, inflorescence architecture, and floral organ identity. Abnormal cell proliferation was observed in the leaves and spikelets, and ectopic or overexpression of several class 1 knox genes was detected; thus, the abnormal cell proliferation in opb mutants is probably caused by ectopic class 1 knox gene expression. The opb mutants also had defects in floral organ identity, resulting in the development of mosaic organs, including gluminous lodicules, staminoid lodicules, and pistiloid stamens. These results, together with the reduced expression of a class B gene, indicate that OPB positively regulates the expression of class B genes. Map-based cloning revealed that OPB encodes a transcription factor that is orthologous to the Arabidopsis JAGGED gene and is expressed in leaf primordia, inflorescence meristem, rachis branch meristems, floral meristem, and floral organ primordia. Taken together, our data suggest that the OPB gene affects cellular proliferation and floral organ identity through the regulation of class 1 knox genes and floral homeotic genes.
- Subjects :
- Alleles
Cell Proliferation
Chromosome Mapping
Cloning, Molecular
Flowers genetics
Flowers growth & development
Flowers metabolism
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Genes, Homeobox
Genes, Plant
Homeodomain Proteins genetics
Oryza metabolism
Phylogeny
Plant Proteins genetics
Plants, Genetically Modified genetics
Plants, Genetically Modified metabolism
RNA, Plant genetics
Transcription Factors genetics
Zinc Fingers
Homeodomain Proteins metabolism
Oryza genetics
Plant Proteins metabolism
Transcription Factors metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1365-313X
- Volume :
- 58
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- The Plant journal : for cell and molecular biology
- Publication Type :
- Academic Journal
- Accession number :
- 19207212
- Full Text :
- https://doi.org/10.1111/j.1365-313X.2009.03823.x