Abstract
Programmed cell death (PCD) in plant cells is often accompanied by biochemical and morphological hallmarks similar to those of animal apoptosis. However, orthologs of animal caspases, cysteinyl aspartate-specific proteases that constitute the core component of animal apoptosis, have not yet been identified in plants. Recent studies have revealed the presence of a family of genes encoding proteins with distant homology to mammalian caspases, designated metacaspases, in the Arabidopsis thaliana genome. Here, we describe the isolation of LeMCA1, a type-II metacaspase cDNA clone from tomato (Lycopersicon esculentum Mill.). BLAST analysis demonstrated that the LeMCA1 gene is located in close vicinity of several genes that have been linked with PCD. Southern analysis indicated the existence of at least one more metacaspase in the tomato genome. LeMCA1 mRNA levels rapidly increased upon infection of tomato leaves with Botrytis cinerea, a fungal pathogen that induces cell death in several plant species. LeMCA1 was not upregulated during chemical-induced PCD in suspension-cultured tomato cells.
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Abbreviations
- DIG:
-
digoxigenin
- hpi:
-
hours post inoculation
- HR:
-
hypersensitive response
- NB:
-
nucleotide binding
- ORF:
-
open reading frame
- PCD:
-
programmed cell death
- PCR:
-
polymerase chain reaction
- RACE:
-
rapid amplification of cDNA ends
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Acknowledgements
The authors thank Rina Michaeli for technical assistance. We are indebted to Prof. Linus van der Plas (Wageningen University) and Dr. Sander van der Krol (Wageningen University) for critically reading the manuscript and stimulating discussions. This work was supported by the Dutch Ministry of Agriculture, Nature Management and Fisheries.
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Hoeberichts, F.A., ten Have, A. & Woltering, E.J. A tomato metacaspase gene is upregulated during programmed cell death in Botrytis cinerea-infected leaves. Planta 217, 517–522 (2003). https://doi.org/10.1007/s00425-003-1049-9
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DOI: https://doi.org/10.1007/s00425-003-1049-9