Trichoderma harzianum

About: Trichoderma harzianum is a research topic. Over the lifetime, 4731 publications have been published within this topic receiving 96796 citations.

In Vitro Antifungal Activity of Strains of Trichoderma harzianum

Abstract: Interactions between Trichoderma harzianum strains and some soilborne plant pathogens (Gaeumannomyces graminis var. tritici, Fusarium culmorum and F. moniliforme) were studied on PDA medium. All T. harzianum strains tested produced a metabolite that inhibited growth of plant pathogenic fungi on PDA medium. When grown in liquid cultures containing laminarin, chitin or fungal cell walls as sole carbon sources, 2 strains of T. harzianum produced 1,3-β-glucanase and chitinase in the medium. Higher levels of these enzymes were induced by T. harzianum T15. Trichoderma harzianum ‹zolatlar›n›n In Vitro Antifungal Aktivitesi Ozet: PDA geliflme ortam›nda, baz› toprak kokenli bitki patojenleri (Gaeumannomyces graminis var. tritici, Fusarium culmorum ve F. moniliforme) ve Trichoderma harzianum streynleri aras›ndaki interaksiyonlar cal›fl›lm›flt›r. Test edilen tum Trichoderma harzianum streynleri, bitki patojeni funguslar›n geliflimini PDA ortam›nda inhibe eden ucucu metabolit uretmifllerdir. Karbon kayna¤› olarak laminarin, kitin veya fungal hucre duvar› iceren s›v› ortamda gelifltirildiklerinde, Trichoderma harzianum'un iki streyni ortamda 1,3- β-glukanaz ve kitinaz enzimleri uretmifllerdir. Bu enzimlerin en yuksek duzeyleri Trichoderma harzianum T15 taraf›ndan uretilmifltir.

Trichoderma-Enriched Biofertilizer Enhances Production and Nutritional Quality of Tomato (Lycopersicon esculentum Mill.) and Minimizes NPK Fertilizer Use

Abstract: Effective biofertilizer reduces not only the load of chemical fertilizers in crop production but also minimizes the pollution by excessive uses of the latter. The impact of Trichoderma-enriched biofertilizer (BioF), i.e., BioF/compost (household/kitchen wastes composted by Trichoderma harzianum T22) and BioF/liquid (T. harzianum T22 grown in liquid media, i.e., broth culture) were evaluated to recognize their roles in growth, yield and nutritional quality of tomato (Lycopersicon esculentum Mill.) in field studies. Encouraging responses were monitored in all respects. Above 200 and 336.5 % yield increase were recorded over control by BioF/compost alone (T3) and its combination with N:P:K (Nitrogen:Phosphorus:Potassium) application (T4), respectively. Application of 50 % BioF/compost and 50 % BioF/liquid with 50 % N:P:K, provided statistically similar and significant (P ≤ 0.05) performance over control but not significant with standard dose of N:P:K. Total soluble solids, sugar, ascorbic acid, β-carotene, lycopene, phosphorus and manganese content in tomato were significantly higher when fertilized with BioF/compost. In addition, protein content and some essential minerals were increased in 50 % BioF/compost + 50 % N:P:K treatment. Trichoderma composted kitchen wastes can serve as prospective biofertilizer for improvement in yield and quality of tomato cultivation.

Cellulase production by trichoderma harzianum in static and mixed solid-state fermentation reactors under nonaseptic conditions.

Abstract: Cellulase production from lignocellulosic materials was studied in solid-state cultivation by both static and mixed techniques under nonaseptic conditions. The effects of fermentation conditions, such as moisture content, pH, temperature, and aeration, on cellulase production by Trichoderma harzianum using a mixture of wheat straw (80%) and bran (20%) were investigated. With a moisture content of 74% and a pH of 5.8., 18 IU filter paper activity and 198 IU endoglucanase activity/g initial substrate content were obtained in 66 h. The extension from static column cultivation to stirred tank reactor of 65 L capacity gave similar yields of cellulase.

Chronological Events Associated with the Antagonistic Properties of Trichoderma harzianum against Botrytis cinerea: Indirect Evidence for Sequential Role of Antibiosis and Parasitism

Abstract: Chronological events associated with the degradation of Botrytis cinerea by a strain of Trichoderma harzianum selected for superior biocontrol ability were studied using ultrastructure and cytochemical investigations in an attempt to define the relative roles of antibiosis and parasitism in the antagonistic process. The first ultrastructural changes were observed 12 h before contact between the organisms, and were characterized by punctuated invaginations of the Botrytis plasmalemma. These reactions were followed by a gradual retraction of the plasmalemma, disorganization of the cytoplasm, loss of turgor pressure and cell death within 48 h of contact between hyphae of the interacting fungi. The first evidence of penetration of B. cinerea by T. harzianum was recorded 72 h after contact. This penetration was apparently mediated by either mechanical pressure or localized wall digestion at points of entry, as there was no clear evidence of chitinolytic degradation of the B. cinerea cell wall, as determined by...