Colony growth, in vitro antagonism and secretion of extracellular enzymes in cold-tolerant strains of Trichoderma species

Zsuzsanna, Antal; László, Manczinger; Szakács, Gy.; Tengerdy, Robert P.; Ferenczy, L.

doi:10.1017/s0953756299001653

Cited by 65 publications

(44 citation statements)

References 12 publications

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“…Several UV-A, UV-C and protoplast fusion mutant biotypes (Figure 2, Figure 3 and Figure 4) behaved better or the same at low temperatures or at alkaline pH when compared to their parental strains, approach that was used by other groups to select Trichoderma strains that could control phytopathogens affecting different crops at temperature values of 10ºC (Antal et al 2000;Kredics et al 2000;Kredics et al 2004). Antal et al (2000) describe that the different Trichoderma strains tested at 10ºC biocontroled Rhizoctonia solani and Fusarium oxysporum f. sp.…”

Section: Discussionmentioning

confidence: 99%

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New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum: their biocontrol activity on Pyrenochaeta lycopersici

Besoaín¹,

Pérez²,

Araya³

et al. 2007

Electron. J. Biotechnol.

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Section: Discussionmentioning

confidence: 99%

“…Antal et al (2000) describe that the different Trichoderma strains tested at 10ºC biocontroled Rhizoctonia solani and Fusarium oxysporum f. sp. dianthi, while T. aureoviride and T. viride were more effective against Pythium debaryanum than T. harzianum at this same temperature.…”

Section: Discussionmentioning

confidence: 99%

New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum: their biocontrol activity on Pyrenochaeta lycopersici

Besoaín¹,

Pérez²,

Araya³

et al. 2007

Electron. J. Biotechnol.

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“…But, dressing the seeds with the spores of mutants of T. harzianum resulted in a significantly greater decrease in the wilt disease incidence under non-saline and saline soils. Colonization of either F. oxysporum or Trichoderma isolates in Natural condition is referring to PDB NaCl free medium; 2 Stress condition is referring to PDB amended with 69 mM NaCl medium; 3 Th50M6 is referring to 50 k-rad γ-induced mutant from the wild type parent T. harzianum. tomato rhizosphere was assessed throughout 90 days growth period in control and saline soils.…”

Section: Pot Trialsmentioning

confidence: 99%

Biocontrol potential of salinity tolerant mutants of Trichoderma harzianum against Fusarium oxysporum

Hassan¹,

Haggag²

2006

Braz. J. Microbiol.

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Exposing a wild-type culture of Trichoderma harzianum to gamma irradiation induced two stable salt-tolerant mutants (Th50M6 and Th50M11). Under saline conditions, both mutants greatly surpassed their wild type strain in growth rate, sporulation and biological proficiency against Fusarium oxysporum, the causal agent of tomato wilt disease. Tolerant T. harzianum mutants detained a capability to grow and convinced sporulation in growth media containing up to 69 mM NaCl. In comparison with their parent strain, characterization of both mutants confirmed that they have reinforced contents of proline and hydroxyproline, relatively higher sodium content compared to potassium, calcium or magnesium contents, higher level of total phenols. Electrophoretic analysis of total soluble proteins in the salt tolerance mutant Th50M6 showed different bands accumulated in response to 69 mM NaCl. Data also showed that mutants produce certain active metabolites, such as chitinases, cellulases, β-galactosidases, as well as, some antibiotics i.e., trichodermin, gliotoxin and gliovirin. Trichoderma mutants significantly reduced wilt disease incidence and improved yield and mineral contents of tomato plants under both saline and non-saline soil conditions, as well as, under infested and natural conditions. T. harzianum mutants were also more efficient in dropping the F. oxysporum growth in rhizosphere compared to the wild type strain. Population density of both mutants in rhizosphere far exceeded that of T. harzianum wild type strain.

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“…• C. Cold-tolerance gives the biocontrol agent an advantage of faster growth and colonization of plant roots in the early spring when the soil temperature is still suboptimal for growth of the pathogen (Antal et al, 2000;Bakshi et al, 2001). Of the ten cold-tolerant Trichoderma strains, three were selected for further testing.…”

Section: Resultsmentioning

confidence: 99%

Selection of natural isolates of Trichoderma spp. for biocontrol of Polymyxa betae as a vector of virus causing rhizomania in sugar beet

et al. 2006

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Abstract:The soil fungus Polymyxa betae, Keskin, besides being a root parasite, plays a role of a vector in dissemination of Beet necrotic yellow vein virus (BNYVV) causing rhizomania in sugar beet. An alternative to its chemical control is the application of antagonistic microorganisms suppressing proliferation of the fungal vector. In the present work, 66 Trichoderma isolates have been obtained from sugar beet plantations from diverse locations in Slovakia. The ability of the selected isolates to grow at low temperature (10 • C) and to suppress the colonization of roots with P. betae and the multiplication of BNYVV in roots under glasshouse conditions were tested. The roots of sugar beet seedlings growing in the BNYVV-infested soil were analyzed by serological ELISA test using monoclonal and polyclonal antibodies for the presence of BNYVV and checked microscopically for the occurrence of cystosori of P. betae. The efficacy of the selected strains to suppress the proliferation of BNYVV varied on the average between 21 and 68%. On the basis of these tests, candidate strains for practical application in biocontrol of sugar beet rhizomania were selected.

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Colony growth, in vitro antagonism and secretion of extracellular enzymes in cold-tolerant strains of Trichoderma species

Cited by 65 publications

References 12 publications

New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum: their biocontrol activity on Pyrenochaeta lycopersici

New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum: their biocontrol activity on Pyrenochaeta lycopersici

Biocontrol potential of salinity tolerant mutants of Trichoderma harzianum against Fusarium oxysporum

Selection of natural isolates of Trichoderma spp. for biocontrol of Polymyxa betae as a vector of virus causing rhizomania in sugar beet

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