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The mutant crispa reveals multiple roles for PHANTASTICA in pea compound leaf development
Alexander D Tattersall1, Lynda Turner, Margaret R Knox
1Department of Crop Genetics, John Ines Centre, Norwich NR4 7UH, United Kingdom.
The Plant Cell
|March 8, 2005
Summary
The PHANTASTICA (PHAN) gene is crucial for leaf development. A pea mutant reveals that PHAN controls leaflet identity, not overall leaf shape, and interacts with KNOX genes to define stipule boundaries.
Area of Science:
- Plant Developmental Genetics
- Leaf Morphology Evolution
- Molecular Plant Biology
Background:
- Pinnate compound leaves possess leaflets along a rachis, unlike simple leaves with a single lamina.
- The PHANTASTICA (PHAN) gene is essential for lamina formation in both simple and compound leaves.
- Previous studies in Antirrhinum and tomato predict phan mutants to have peltate or abaxialized rachis structures.
Purpose of the Study:
- To characterize the 'crispa' mutant in pea (Pisum sativum) and its role in leaf development.
- To investigate the function of the PHAN gene in the context of pea's pinnate compound leaf morphology.
- To elucidate the interaction between CRISPA, KNOX genes, and stipule boundary formation in pea.
Main Methods:
- Phenotypic characterization of the pea 'crispa' (phan) mutant.
- Analysis of PHAN and class 1 KNOTTED1-like homeobox (KNOX) gene expression patterns.
- Comparative analysis of leaf initiation mechanisms across different species (pea, Arabidopsis, tomato).
Main Results:
- The pea 'crispa' mutant exhibits abaxialized individual leaflets while maintaining pinnate leaf architecture.
- Ectopic stipules develop on the petiole-rachis axis in the mutant, linked to ectopic KNOX gene expression.
- CRISPA and KNOX gene interactions are shown to specify stipule boundaries.
- Gene expression patterns suggest pea leaf initiation is more similar to Arabidopsis than tomato.
Conclusions:
- Contrary to predictions, the pea PHAN gene ('CRISPA') regulates leaflet identity rather than overall leaf shape.
- The study reveals a novel role for CRISPA in specifying stipule boundaries through interaction with KNOX genes.
- Pea leaf development shares similarities with Arabidopsis, differing from the tomato model.
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