Colonization of root tissues and protection against Fusarium wilt of rye (Secale cereale) by nonpathogenic rhizosphere strains of Fusarium culmorum

Hydrolysis of fungal and plant cell walls by enzymatic complexes from cultures of Fusarium isolates with different aggressiveness to rye (Secale cereale)

“…The hydrolytic efficiency of the enzymes originating from the DEMFc37 and DEMFc5 preparations at both pH values tested was similar; however, at pH 8.8, the activity of the DEMFc5 enzymes was significantly higher. These findings strongly suggest that the earlier reported (Jaroszuk-Ś ciseł et al 2008(Jaroszuk-Ś ciseł et al , 2011 differences in plant tissue colonization and induction of disease symptoms between the pathogenic strain DEMFc37 and the rhizosphere isolates of Fusarium culmorum may be related to differences in the efficiency of plant cell degradation by the enzymes released by these strains to the PCW growth medium.…”

“…The highest effectiveness of DEMFc2 in degrading FCW can explain the protective effect of pre-inoculation of rye with this isolate against infection by the pathogenic strain DEMFc37 (Jaroszuk-Ś ciseł et al 2008). This is because one product of chitin degradation by the PGPF isolate is an oligosaccharide with elicitor activity which could induce plant resistance (Shibuya and Minami 2001).…”

“…Cytological studies of root sections 4 days after inoculation indicated the presence of wall appositions, which are symptoms of a defense reaction in plant cells, associated with a fungal infection (Jaroszuk-Ś ciseł et al 2008). This observation suggested that the 24-h interval between inoculation with a rhizosphere strain and the introduction of the pathogen may be sufficient to start a cascade of plant reactions involved in the induced systemic reaction.…”

Efficiency of indoleacetic acid, gibberellic acid and ethylene synthesized in vitro by Fusarium culmorum strains with different effects on cereal growth

“…Smith) strains with distinct effects on the growth of rye (Jaroszuk-Ścise l et al 2008), wheat, and barley: two nonpathogenic rhizospheric isolates (DEMFc2 and DEMFc5) and one pathogenic isolate (DEMFc37) provoking fusarium wilt symptoms and an 80% reduction in shoot fresh weight. The F. culmorum strains were deposited in the Fungal Collection of the Department of Environmental Microbiology (DEM) at Maria Curie-Sklodowska University, Lublin, Poland, and in the Centraalbureau voor Schimmelcultures Collections (CBS), P.O.…”

“…Three strains were studied: (i) a pathogenic isolate DEMFc37; (ii) a deleterious rhizosphere microorganism (DRMO) isolate DEMFc5; and (iii) a plant growth promoting fungal (PGPF) isolate DEMFc2. We have hypothesized that differences in the levels of phytohormone synthesis could be one of the factors leading to dissimilarities in the way these F. culmorum isolates interact with cereal plants (Jaroszuk-Ścise l et al 2008(Jaroszuk-Ścise l et al , 2009). Significant differences in the activities of cell wall degrading enzyme complexes released to the medium by these F. culmorum isolates and in the ability of these complexes to degrade plant and fungal cell walls (Jaroszuk-Ścise l et al 2011(Jaroszuk-Ścise l et al , 2012 could also be responsible for the varying effect of these strains on plant growth.…”