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Trichoderma harzianum
About: Trichoderma harzianum is a research topic. Over the lifetime, 4731 publications have been published within this topic receiving 96796 citations.
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TL;DR: The biocontrol agents established in the soil and their CFU increased significantly and being greater in pathogen infested soils than non infested soil during 4 months period.
58 citations
TL;DR: T1 and T2 isolates and their combination were more effective than other treatments in controlling the disease, such that it reduced disease severity from 20 to 44% and increased the dry weight from 23 to 52%.
Abstract: The Fusarium disease, caused by Fusarium oxysporum has been observed in different areas of Iran in recent years. Current biocontrol studies have confirmed the effectiveness of the Trichoderma species against many fungal phytopathogens. In this study, biocontrol effects of Trichoderma isolates alone and in combination were evaluated against F. oxysporum pathogen. This study shows the ability of Trichoderma harzianum isolates which had been isolated from soil and as such, lentil roots were compared to the combination of the three fungal lentil Fusarium root. Three isolates ( T. harzianum ) T1, ( Trichoderma asperellum ) T2, ( Trichoderma virens ) T3, were selected base on good antagonist effect after screening tests for antifungal combination effects against Fusarium disease pathogen in greenhouse. In dual culture tests, three (T1, T2 and T3) isolates covered and colonized the colony of the pathogen. In other experiment, three (T1, T2 and T3) isolates covered and colonized the colony of the other Trichoderma isolates. Microscopic studies revealed hyphal coiling (hyperparasitism) of isolates T1 and T2 around F. oxysporum hyphae. Volatile metabolites of all isolates reduced the mycelial growth of fusarium pathogen. T1 and T2 isolates and their combination were more effective than other treatments in controlling the disease, such that it reduced disease severity from 20 to 44% and increased the dry weight from 23 to 52%. All treatments showed significant differences with control plants. Keywords: Fusarium rot, lentil, combination, Trichoderma , biocontrol
57 citations
TL;DR: The results show that the use of fungal cultures was more effective for benzo[a]pyrene degradation than theUse of bacterial cultures even when the concentration was increased three-fold, and shows that theuse of a defined fungal–bacterial co-culture can enhance benzo-a-pyrene biodegradation.
57 citations
TL;DR: Trichoderma harzianum may act as solution for the problem caused by polyethylene in nature as this organism was isolated from local dumpsites of Shivamogga District for use in the biodegradation ofpolyethylene.
Abstract: Trichoderma harzianum was isolated from local dumpsites of Shivamogga District for use in the biodegradation of polyethylene. Soil sample of that dumpsite was used for isolation of T. harzianum. Degradation was carried out using autoclaved, UV-treated, and surface-sterilized polyethylene. Degradation was monitored by observing weight loss and changes in physical structure by scanning electron microscopy, Fourier transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. T. harzianum was able to degrade treated polyethylene (40 %) more efficiently than autoclaved (23 %) and surface-sterilized polyethylene (13 %). Enzymes responsible for polyethylene degradation were screened from T. harzianum and were identified as laccase and manganese peroxidase. These enzymes were produced in large amount, and their activity was calculated using spectrophotometric method and crude extraction of enzymes was carried out. Molecular weight of laccase was determined as 88 kDa and that of manganese peroxidase was 55 kDa. The capacity of crude enzymes to degrade polyethylene was also determined. By observing these results, we can conclude that this organism may act as solution for the problem caused by polyethylene in nature.
57 citations
TL;DR: Different quality indicators such as the C:N ratio of the fungal food sources as well as other biological parameters are discussed in relation to their reproductive value and Collembola preferential feeding.
Abstract: The potential reproductive value of arbuscular mycorrhizal fungi (Glomus intraradices and Glomus invermaium), root pathogenic fungi (Rhizoctonia solani and Fusarium culmorum) and saprotrophic fungi (Penicillium hordei and Trichoderma harzianum) were examined for the collembolans Folsomia candida Willem and Folsomia fimetaria L. Dried baker's yeast (Saccharomyces cerevisiae) was used as a reference standard food in laboratory cultures. Collembolan performance was determined as final size, fecundity and population growth rate after when fed the fungal food sources for 31 days. The mycorrhizal fungi gave the least growth and fecundity compared with the other fungi, but G. intraradices gave good fecundity for F. candida. In terms of growth, Baker's yeast was a high-quality food for both adults and juveniles of both species, but it was a poorer food in terms of fecundity of F. candida. Preference of the fungi in all possible pairwise combinations showed that although F. fimetaria did not perform well on Glomus spp. and F. candida did not grow well on Glomus spp. their preference for these fungi did not reflect this. The highest fecundity was seen with the root pathogen F. culmorum. Different quality indicators such as the C:N ratio of the fungal food sources as well as other biological parameters are discussed in relation to their reproductive value and Collembola preferential feeding.
57 citations