نتایج جستجو برای: trichoderma harzianum bi
تعداد نتایج: 52407 فیلتر نتایج به سال:
Trichoderma are ubiquitous soil fungi that include species widely used as biocontrol agents in agriculture. Many isolates are known to secrete several secondary metabolites with different biological activities towards plants and other microbes. Harzianic acid (HA) is a T. harzianum metabolite able to promote plant growth and strongly bind iron. In this work, we isolated from the culture filtrat...
در این مطالعه تاثیر آنتاگونیستی شش جدایه از دو گونه Trichoderma شامل Trichoderma harzianum و Trichoderma viride بر رشد گیاه ریحان و پاسخ‌های دفاعی گیاه علیه Rhizoctonia solani بررسی شده است. بذرهای گیاه ریحان پس از تیمار با دو گونه Trichoderma، در خاک آلوده به R. solani کشت گردید و پس از 40 روز ویژگی‌های رشد گیاه و شدت بیماری مرگ گیاهچه بررسی شد و میزان فعالیت آنزیم پراکسیداز، فنل کل و مالون دی...
trichoderma species are among important antagonists of plant pathogenic fungi. the main purpose of this study was to evaluate the biocontrol potential of native trichoderma spp. isolates from sugar beet fields against phytophthora drechsleri and p. cryptogea, the causal agents of phytophthora root rot of sugar beet. during 2007–08, 85 isolates of trichoderma spp. from sugar beet fields in eight...
Trichoderma sp., a well known biological control agent against several phytopathogens, was tested for its phosphate (P) solubilizing potential. Fourteen strains of Trichoderma sp. were isolated from the forest tree rhizospheres of pinus, deodar, bamboo, guava and oak on Trichoderma selective medium. The isolates were tested for their in-vitro P-solubilizing potential using National Botanical Re...
Several Trichoderma isolates were screened for their biocontrol activity against Fusarium oxysporum f.sp. pisi. Eighteen of these isolates (T1 to T18) showed considerable biocontrol potential and were taken further in the study. Initial counter inhibition was observed in all the eighteen dual culture sets where Trichoderma and Fusarium both posed varying degree of inhibition on each other. In t...
Fungi of the genus Trichoderma are used as biocontrol agents against several plant pathogenic fungi like Rhizoctonia spp., Pythium spp., Botrytis cinerea and Fusarium spp. which cause both soil-borne and leaf- or flower-borne diseases of agricultural plants. Plant disease control by Trichoderma is based on complex interactions between Trichoderma, the plant pathogen and the plant. Until now, tw...
در این بررسی تاثیر جدایه هایی از قارچ های آنتاگونیست (T1, T2) Trichoderma harzianum (T3, T4) T. viride روی بیماری پژمردگی فوزاریومی گوجه فرنگی در اثر Fusarium oxysporum f.sp.lycopersici ارتفاع و وزن تربوته ها در طرح کاملا تصادفی در 6 تیمار در گلخانه و خاک آلوده به فوزاریوم روی گوجه فرنگی رقم Mony meker مورد مطالعه قرار گرفت. نتایج نشان داد که جدایه های Trichoderma مخلوط با خاک آلوده به فوزاریوم...
Trichoderma harzianum is a ubiquitous species in the environment and is effective in the biological control of plant-pathogenic fungi. T. harzianum has not been linked unequivocally to its sexual state nor has its phylogeny been studied in detail. It has been suggested that T. harzianum is a species complex based on the phenotypic and genotypic variability encountered. On the basis of morpholog...
Sequences of the internal transcribed spacer region 1 (ITS1) of the ribosomal DNA were used to determine the phylogenetic relationships of species of Trichoderma sect. Pachybasium. To this end, 85 strains-including all the available ex-type strains-were analyzed. Parsimony analysis demonstrated that the section is nonmonophyletic, distributing the 85 strains among three main groups that were su...
کنترل بیولوژیک بیماری پوسیدگی فوزاریمی ریشه گندم با استفاده از آنتاگونیست های قارچی دراستان مازندران
عامل پوسیدگی ریشه گندم قارچ (gibberella zeae (schw.) petch (fusarium graminearum (schwabe می باشد. این بیماری در زمین های آلوده و شرایط مناسب باعث کاهش عملکرد قابل توجه محصول می گردد. هدف از این مطالعه بررسی اثر بخشی گونه های قارچ های آنتاگونیست انتخاب شده در برابر پاتوژن خاکزی f. graminearum تحت شرایط گلخانه و مزرعه بود. در این بررسی رشد قارچ f. graminearum (f3) توسط متابولیت های آزاد سلولی و ...
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