Induced resistance against Fusarium wilt of tomato by Penicillium oxalicum is not associated to pathogenesis-related proteins
Garcia Lepe, R.; Rodriguez, P.; Cal, A. de; Garcia Olmedo, F.; Melgarejo, P.
Bulletin OILB/SROP 21(9): 123-127
Penicillium oxalicum has been shown to induce resistance in tomato (cv. Lorena) against Fusarium oxysporum f.sp. lycopersici. Plants were either previously treated in the seedbed with a conidial suspension (107 conidia/ml) of P. oxalicum seven days before transplanting or were soaked in a P. oxalicum conidia solution 30 min before transplanting. F. oxysporum f.sp. lycopersici race 2 was inoculated just before transplanting. Disease severity and stunting caused by F. oxysporum f.sp. lycopersici were significantly reduced (P=0.05) in tomato plants treated with P. oxalicum by 45% and 25%, respectively. No changes in protein patterns and no accumulation in the pathogenesis-related proteins (PRs) in tomato plants treated with P. oxalicum were observed. The induction of mRNA of extracellular 35kDa acidic beta -1,3-glucanase and intracellular 33 kDa basic beta -1,3-glucanase by F. oxysporum f.sp. lycopersici was recorded. The association between induced resistance and PRs accumulation is discussed.