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Systemic protection against pearl millet downy mildew disease induced by cell wall glucan elicitors from Trichoderma hamatum UOM 13

100%

Lavanya S. N., Niranjan-Raj S., Nayaka S. C., Amruthesh K. N.

Journal of Plant Protection Research

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2017

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tom 57

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nr 3

The obligate oomycete Sclerospora graminicola (Sacc.) Schroet, is the incitant of downy mildew disease, which is the main constraint in pearl millet production worldwide. Different elicitors from Trichoderma hamatum UOM 13, e.g. mycelial extract and cell wall glucans, were assessed for their resistance elicitation efficiency and the possible underlying mechanisms. Both mycelial extract and cell wall glucans of T. hamatum UOM 13 positively influenced seed quality parameters of pearl millet, significantly enhanced seed germination and seedling vigor in comparison to the untreated control. Seed priming with cell wall glucan elicitors of T. hamatum UOM 13 suppressed downy mildew on susceptible pearl millet seedlings under greenhouse conditions by induction of systemic host resistance. Of the different elicitor delivery methods tested, transplant root dip was more effective than seed treatment and foliar spray. A combination of transplant root dip + seed treatment + foliar spray was significantly more effective than the single delivery methods. The induced resistance corresponded to up regulation of genes of important defense proteins upon pathogen inoculation. Transcripts of genes of defense enzymes glucanase, phenylalanine ammonia lyase, peroxidase and polyphenoloxidase were significantly increased due to the T. hamatum UOM elicitor effect. Expression of hydroxyproline-rich glycoprotein genes, known to play an important role in cell wall cross-linking, were also up regulated in response to T. hamatum UOM cell wall glucan treatment. This study emphasizes the role of T. hamatum UOM as a potential elicitor of downy mildew resistance in pearl millet and presents novel insights into the involvement of important defense proteins mediating such as resistance trigger.

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Uzdolnienia lityczne grzybów z rodzaju Trichoderma w obecności biomasy fitopatogenów

99%

Witkowska D., Stolas J., Kancelista A., Piegza M.

Acta Scientiarum Polonorum. Biotechnologia

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2009

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tom 08

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nr 2

W prezentowanej pracy przebadano uzdolnienia trzech szczepów grzybów strzępkowych z rodzaju Trichoderma w kierunku produkcji enzymów litycznych efektywnych w degradacji ścian komórkowych mikroorganizmów patogenicznych, a istotnych w procesie zwanym mykoparazytyzmem. We wgłębnych hodowlach wstrząsanych stosowano dwa podłoża o zmiennym składzie, nie tylko ze względu na proste składniki mineralne, ale także odmienne pod kątem złożonych źródeł węgla, będących równocześnie induktorami ocenianych hydrolaz. Stwierdzono zróżnicowanie w produkcji badanych enzymów, a najwyższymi uzdolnieniami do biosyntezy chitynaz i P-1,3-glukanaz charakteryzował się szczep Trichoderma hamatum C1 (odpowiednio 1,17 nKat-ml-1, 27 nKat-ml-1). Aktywne w produkcji chitynaz i laminarynaz szczepy grzybów strzępkowych mogą być przydatne jako szczepionki w ochronie roślin przed patogennymi grzybami.

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Biosynthesis and properties of beta-1,3-glucanases of Trichoderma hamatum

80%

Maj A., Witkowska D., Robak M.

Electronic Journal of Polish Agricultural Universities. Series: Biotechnology

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2002

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tom 05

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nr 2

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Effect of glyphosate on the growth and sporulation of several fungi species grown in vitro

80%

Wachowska U.

Acta Mycologica

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1998

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tom 33

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nr 1

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Influence of Buranit 74 EC and Expander 400 SC on the protective activity of Trichoderma hamatum, Gliocladium catenulatum and G.roseum against sugar-beet damping-off

80%

Moliszewska E. B.

Bulletin of the Polish Academy of Sciences. Biological Sciences

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2001

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tom 49

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nr 3

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The occurrence of antagonistic microorganisms in the soil after the cultivation of spring rye and common vetch

80%

Pieta D., Kesik T.

Acta Scientiarum Polonorum. Hortorum Cultus

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2005

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tom 04

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nr 1

The object of the studies were saprophytic bacteria and fungi isolated from the soil after the cultivation of spring rye and common vetch. The studies were conducted in laboratory conditions. The antagonistic effect of the isolates of Bacillus spp., Pseudomonas spp., Trichoderma hamatum and Trichoderma koningii was determined towards such pathogenic fungi as Alternaria alternata., Botrytis cinerea, Fusarium culmorum, Fusarium oxysporum, Fusarium solani, Phoma exigua var exigua, Pythium irregulare, Rhizoctonia solani and Sclerotinia sclerotiorum. It turned out on the basis of the obtained results that the highest antagonistic effect was characteristic of the isolates of Trichoderma koningii, while the smallest of Trichoderma hamatum. Among the examined bacteria isolates Pseudomonas spp. appeared to be a poorer antagonist than Bacillus spp.

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Ocena przydatności drożdży i fungicydów do ograniczenia rozwoju grzybów zasiedlających siewki sosny zwyczajnej

71%

Wachowska U., Popielarczyk C., Duba A., Goriewa K., Kucharska K.

Sylwan

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2016

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tom 160

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nr 07

In the nurseries, Scots pine seedlings that show symptoms of the damping−off usually die. Rhizoctonia solani, a rapidly growing fungus, is one of the pathogens that infect the roots of plants. The aims of this study were: (1) to evaluate the susceptibility of R. solani and saprotrophic fungi Mortierella elongata, Trichoderma hamatum and T. rossicum to fungicides, (2) to determine whether yeast isolates can be used as effective inhibitors of the pathogen's growth, and (3) to analyze phylogenetic relationships between filamentous fungi. The Switch 62.5 WG fungicide, containing cyprodinil and fludioxonil, most effectively suppressed the growth of the tested R. solani isolates, but also exerted ecotoxic effects on the analyzed saprotrophs. The R. solani RS 1 isolate did not respond to the presence of azoxystrobin in PDA. Most of the 13 yeast isolates tested in the study inhibited the growth of pathogen colonies, but only one isolate was characterized by inhibitory activity of 59.03% and exerted a strong antagonistic influence on the pathogen. A phylogenetic analysis revealed that the tested isolates represented three clades: 1) T. hamatum, 2) T. rossicum, and 3) R. solani. The phylogenetic tree of M. hamatum and T. rossicum showing their divergence due to mutations did not reflect their speciation.