TheBLADE-ON-PETIOLEgenes are essential for abscission zone formation inArabidopsis
| Autor: | Sarah M. McKim, Shelley R. Hepworth, Melinka A. Butenko, Sung Ki Cho, George W. Haughn, Grethe-Elisabeth Stenvik, Wenche Kristiansen, Reidunn B. Aalen |
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| Rok vydání: | 2008 |
| Předmět: |
DNA
Plant Cellular differentiation Arabidopsis Flowers Genes Plant Models Biological Petiole (botany) Abscission Gene Expression Regulation Plant Botany Molecular Biology Body Patterning DNA Primers Regulation of gene expression Base Sequence biology Arabidopsis Proteins Reverse Transcriptase Polymerase Chain Reaction fungi Gene Expression Regulation Developmental food and beverages Plants Genetically Modified Floral organ abscission biology.organism_classification Cell biology Plant Leaves Inflorescence Mutation Petal Transcription Factors Developmental Biology |
| Zdroj: | Development. 135:1537-1546 |
| ISSN: | 1477-9129 0950-1991 |
| Popis: | The Arabidopsis BLADE-ON-PETIOLE 1 (BOP1) and BOP2 genes encode redundant transcription factors that promote morphological asymmetry during leaf and floral development. Loss-of-function bop1 bop2 mutants display a range of developmental defects, including a loss of floral organ abscission. Abscission occurs along specialised cell files, called abscission zones (AZs) that develop at the junction between the leaving organ and main plant body. We have characterized the bop1 bop2 abscission phenotype to determine how BOP1 and BOP2 contribute to the known abscission developmental framework. Histological analysis and petal breakstrength measurements of bop1 bop2 flowers show no differentiation of floral AZs. Furthermore,vestigial cauline leaf AZs are also undifferentiated in bop1 bop2mutants, suggesting that BOP proteins are essential to establish AZ cells in different tissues. In support of this hypothesis, BOP1/BOP2 activity is required for both premature floral organ abscission and the ectopic abscission of cauline leaves promoted by the INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) gene under the control of the constitutive CaMV 35S promoter. Expression of several abscission-related marker genes, including IDA, is relatively unperturbed in bop1 bop2 mutants,indicating that these AZ genes respond to positional cues that are independent of BOP1/BOP2 activity. We also show that BOP1 and BOP2promote growth of nectary glands, which normally develop at the receptacle adjacent to developing AZs. Taken together, these data suggest that BOP1/BOP2 activity is required for multiple cell differentiation events in the proximal regions of inflorescence lateral organs. |
| Databáze: | OpenAIRE |
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