Abstract
Establishment of a plant-pathogen interaction involves differential gene expression in both organisms. In order to isolate Botrytis cinerea genes whose expression is induced during its interaction with tomato, a comparative analysis of the expression pattern of the fungus in planta with its expression pattern during in vitro culture was performed by differential display of mRNA (DDRT-PCR). Discrimination of fungal genes induced in planta from plant defense genes induced in response to the pathogen was attempted by including in this comparative analysis the expression patterns of healthy tomato leaves and of tomato leaves infected with two different pathogens, either Phytophthora infestans or tobacco necrosis virus (TNV). Using a limited set of primer combinations, three B. cinerea cDNA fragments, ddB-2, ddB-5 and ddB-47, were isolated representing fungal genes whose expression is enhanced in planta. Northern blot analysis showed that the transcripts detected with the cDNA clones ddB-2 and ddB-5 accumulated at detectable levels only at late time points during the interaction. The cDNA clone ddB-47 detected two different sizes of transcripts displaying distinct, transient expression patterns during the interaction. Sequence analysis and database searches revealed no significant homology to any known sequence. These results show that the differential display procedure possesses enough sensitivity to be applied to the detection of fungal genes induced during a plant-pathogen interaction. Additionally, four cDNA fragments were isolated representing tomato genes induced in response to the infection caused by B. cinerea, but not by P. infestans.
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Benito, E.P., Prins, T. & van Kan, J.A.L. Application of differential display RT-PCR to the analysis of gene expression in a plant-fungus interaction. Plant Mol Biol 32, 947–957 (1996). https://doi.org/10.1007/BF00020491
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DOI: https://doi.org/10.1007/BF00020491