Journal
PLOS ONE
Volume 10, Issue 6, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0130534
Keywords
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Categories
Funding
- BBSRC
- Syngenta entitled 'Early sensing of plant pathogenic fungi' [2045]
- Technology Strategy Board entitled 'Syield' [5118]
- BBSRC Strategic Institute Strategic Programme grant entitled 20: 20 wheat [BB/J/00426X/1]
- BBSRC [BB/I000488/1, BB/K020056/1, BBS/E/C/00005192, BBS/E/C/00005203] Funding Source: UKRI
- EPSRC [TS/I000739/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BBS/B/12261, BBS/E/C/00005203, BBS/E/C/00005192, BB/I000488/1, BB/K020056/1] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [TS/I000739/1] Funding Source: researchfish
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Phytopathogenic fungi form intimate associations with host plant species and cause disease. To be successful, fungal pathogens communicate with a susceptible host through the secretion of proteinaceous effectors, hydrolytic enzymes and metabolites. Sclerotinia sclerotiorum and Botrytis cinerea are economically important necrotrophic fungal pathogens that cause disease on numerous crop species. Here, a powerful bioinformatics pipeline was used to predict the refined S. sclerotiorum and B. cinerea secretomes, identifying 432 and 499 proteins respectively. Analyses focusing on S. sclerotiorum revealed that 16% of the secretome encoding genes resided in small, sequence heterogeneous, gene clusters that were distributed over 13 of the 16 predicted chromosomes. Functional analyses highlighted the importance of plant cell hydrolysis, oxidation-reduction processes and the redox state to the S. sclerotiorum and B. cinerea secretomes and potentially host infection. Only 8% of the predicted proteins were distinct between the two secretomes. In contrast to S. sclerotiorum, the B. cinerea secretome lacked CFEM-or LysM-containing proteins. The 115 fungal and oomycete genome comparison identified 30 proteins specific to S. sclerotiorum and B. cinerea, plus 11 proteins specific to S. sclerotiorum and 32 proteins specific to B. cinerea. Expressed sequence tag (EST) and proteomic analyses showed that 246 S. sclerotiorum secretome encoding genes had EST support, including 101 which were only expressed in vitro and 49 which were only expressed in planta, whilst 42 predicted proteins were experimentally proven to be secreted. These detailed in silico analyses of two important necrotrophic pathogens will permit informed choices to be made when candidate effector proteins are selected for function analyses in planta.
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