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Comparative Transcriptome Analysis Reveals Novel Candidate Resistance Genes Involved in Defence against Phytophthora
Anupam Gogoi1,2, Erik Lysøe2, Håvard Eikemo2
1Department of Plant Sciences, Faculty of Biosciences (BIOVIT), Norwegian University of Life Sciences (NMBU), 1433 Ås, Norway.
This study identifies novel disease resistance genes in wild strawberry (Fragaria vesca) that could protect crops from Phytophthora cactorum crown rot. These findings offer new strategies for developing resistant strawberry cultivars.
Area of Science:
- Plant Pathology
- Genomics
- Molecular Biology
Background:
- Crown rot, caused by Phytophthora cactorum, is a significant threat to commercial strawberry production.
- Wild strawberry species, Fragaria vesca, possess valuable genetic resistance to P. cactorum.
- Understanding strawberry defense mechanisms is crucial for breeding resistant cultivars.
Purpose of the Study:
- To identify novel disease resistance (R) genes in Fragaria vesca conferring resistance to Phytophthora cactorum.
- To compare gene expression profiles between resistant and susceptible F. vesca genotypes upon P. cactorum inoculation.
- To investigate the role of the RPc-1 locus in strawberry defense against P. cactorum.
Main Methods:
- Comparative transcriptome analysis using RNA-Seq on wounded and P. cactorum-inoculated F. vesca genotypes.
- Differential gene expression analysis to identify defense-related genes.
- PCR analysis to confirm the presence of specific R-genes in resistant genotypes.
Main Results:
- Several defense-related genes, including putative R-genes, were highly expressed in resistant F. vesca genotypes.
- Seven novel R-genes were exclusively expressed in resistant genotypes and absent in the susceptible one.
- Differential expression of 35-38 genes within the RPc-1 locus was observed in resistant genotypes post-inoculation.
Conclusions:
- Novel candidate disease resistance genes have been identified in Fragaria vesca.
- These genes, particularly those within the RPc-1 locus, play a significant role in plant defense against P. cactorum.
- Further research into these candidate genes could lead to the development of P. cactorum-resistant strawberry varieties.
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