Paulo Vitor Dutra de Souza 2. X Poncirus trifoliata L. Palavras-chave: endomicorrizas, citros, reguladores de crescimento. Citrus plants generaly depend on arbuscular mycorrhizal fungi AMF. There are several reports indicating interaction between hormones and AMF. It has also been proven that plant and AMF symbiosis benefits from auxin aplication to roots.
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Parasitism of Rhizoctonia solani by strains of Trichoderma spp. Parasitismo de Rhizoctonia solani por linhagens de Trichoderma spp. Directory of Open Access Journals Sweden. Full Text Available Rhizoctonia solani causes serious diseases in a wide range of plant species. The fungus Trichoderma has been shown to be particularly effective in the control of the pathogen. Thus, this research was carried out to screen fourteen Trichoderma strains against R. All strains tested inhibited the growth of R.
Three T. Electron microscopic observations revealed that all T. Th-9 grew toward and coiled around the host cells, penetrating and destroying the hyphae.
Penetration of host cells was apparently accomplished by mechanical activity. Onze linhagens de T. Todas as linhagens de Trichoderma spp. Uma linhagem de T. Dentre os derivados da lignina, oito compostos eram do tipo p-hidroxifenila, 11 compostos do tipo guaiacila e quatro compostos do tipo siringila. This study elucidated, through analytical pyrolysis coupled to gas chromatography and mass spectrometry, changes in the chemical composition of lignin on leaf sheaths of rice plants of cultivars BR-Irga and Labelle supplied or non-supplied with silicon Si and infected with Rhizoctonia solani.
The Si concentration on leaf sheaths of plants supplied with this element was significatively higher. Influence of selected Rhizoctonia solani isolates on sugar beet seedlings. Full Text Available From to the levels of sugar beet seedlings infection caused by Rhizoctonia solani were compared in laboratory tests.
Sugar beet lines with tolerance to rhizoctoniosis and cultivars without tolerance were infected artificially by R. These isolates belong to the second anastomosis group AG, which is usually highly pathogenic to beet roots. The aim of the experiment was to test whether the tolerance of sugar beet genotypes to R. Sugar beet lines tolerant to brown root rot in laboratory tests were significantly less sensitive to infection of the seedlings by R.
Rhizoctonia solani AG 2 isolates demonstrated considerable differences in pathogenicity against seedlings of sugar beet lines and cultivars. The strongest infection of sugar beet seedlings occurred with the isolate R28b. The greatest tolerance to infection by AG 2 isolates was found for the S5 and S3 breeding lines. Estudio del antagonismo de algunas especies de Trichoderma sobre Fusarium Oxysporum y Rhizoctonia Solani Antagonism studies of Trichoderma sp.
Several experiments were conducted to study the antagonism of 17 isolates of Trichoderma from Colombian soils with Fusarium oxysporum and Rhizoctonia solani. In "in vitro" tests, a high antagonism between colonies was found being greater the antagonism of Trichoderma with R. At the microscopic level it was observed a great interaction between T. The Trichoderma isolates caused reduction in the disease severity, in the incubation period and a lower number of diseased cucumber plants when they were inoeulated with F.
Variety LCSD - was found to be the most resistant. Isolates obtaind from flax and potatoes were especially pathogenic. Rhizoctonia solani was parasitic during the whole vegetation season, but particularly in the course of emergence. Parasitism of this fungus is of great economical significance.
The molecular processes that mediate sugar beet resistance to R. Compatible biological and chemical control systems for Rhizoctonia solani in potato. A series of chemical and biological control agents were tested for compatibility with the Rhizoctonia -specific biocontrol fungus Verticillium biguttatum aimed at designing novel control strategies for black scurf Rhizoctonia solani and other tuber diseases in potato.
The efficacy of chemicals,. In vitro antagonistic activity of fungi isolated from sclerotia on potato tubers against Rhizoctonia solani.
Forty-five fungal isolates were obtained from sclerotia of Rhizoctonia solani on potato tubers in Erzurum, Turkey. The interaction between fungal isolates and R. Some fungal isolates affected R. Results of the antagonism tests showed that Acremonium sp. Real-time pcr qpcr assay for rhizoctonia solani anastomoses group ag iiib. It causes crown and root rot disease which leads to yield losses world-wide.
The soil-borne pathogen is difficult to detect and quantify by conventional methods. The limit of quantification of the assay is 1. The amplification efficiency was The assay will be helpful in the diagnoses of Rhizoctonia solani infection of sugar beet and maize roots and in the quantification of R. Biological control of Rhizoctonia solani on potato by Verticillium Jun 3, All isolates of V. After the coiling around of R.
Gliocladium spp. This fungus causes aerial or foliar blight of soybean, and cultural measures are thought as important choices for the control before the establishment of the disease. Based on evidences that potassium amendments can substantially reduce the severity of several soybean diseases such as Cercospora leaf blight Cercospora kikuchii, pod and stem blight Phomopsis phaseoli var. Despite all evidence, there is no information in the literature about the effect of potassium controlling the soybean foliar blight.
Rhizoctonia solani as a component in the bottom rot complex of glasshouse lettuce. The basal parts of maturing glasshouse lettuce can be attacked by several soil fungi, which cause bottom rot. Until recently quintozene was generally applied against this disease complex.
The study of the causal fungi - especially Rhizoctonia solani - and their control was. An improved understanding of the diversity and population structure of this pathogen could benefit management practices.
Microsatellites have become an invaluable tool Biocontrol of Rhizoctonia solani and Pythium ultimum on Capsicum by Trichoderma koningii in potting medium. Two isolates of Trichoderma koningii were evaluated for efficacy in control of damping-off diseases in seedlings of Capsicum annuum grown in pasteurized potting medium in a glasshouse.
A selected isolate of binucleate Rhizoctonia and two fungicides were also included as standards for control of Rhizoctonia solani and Pythium ultimum var. Both isolates of T. Neither isolate of T. The implications of these results for commercial disease management are discussed. Biocontrol efficacy of different isolates of Trichoderma against soil borne pathogen Rhizoctonia solani. In this study, the biocontrol abilities of water-soluble and volatile metabolites of three different isolates of Trichoderma T.
The results showed for the first time that mycelial growth inhibition of the pathogen was In vivo antagonistic activity of Trichoderma isolates against R. We observed that T. These results showed that three isolates of Trichoderma could be used as effective biocontrol agents against R. Molecular identification and characterization of Rhizoctonia solani AG-3 isolates causing black scurf of potato. Twenty-six isolates of Rhizoctonia solani AG-3 were collected from four potato growing area of Saudi Arabia.
Molecular identification of R. Twenty-six isolates of R. All isolates were inoculated on potato and observations on the percentage of disease incidence were recorded. Genomic DNA extraction of R. A single splinter of nearly bp was only amplified once genomic DNA from R.
Amplicon size of three ISSR primers ranged from 0. Using the three primers, the tested isolates were separated on the basis of genetic similarity coefficients GSC. The range of the GSC was beginning at 0. The present method provided rapid and reliable detection of R. Molecular characterization have great genetic variation in the R. Fatores envolvidos na supressividade a Rhizoctonia solani em alguns solos tropicais brasileiros. O efeito supressivo a R.
Rhizoctonia solani AG 3-PT is an important potato pathogen causing significant yield and quality losses in potato production. However, little is known about the levels of genetic diversity and structure of this pathogen in South Africa. A total of R. Microsatellite analysis found high intra-population genetic diversity, population differentiation and evidence of recombination.
A total of 78 multilocus genotypes were identified with few shared among populations. Most of the loci were in Hardy-Weinberg equilibrium and all four populations showed evidence of a mixed reproductive mode of both clonality and recombination. The PCoA clustering method revealed genetically distinct geographic populations of R. This study showed that populations of R.
This is the first study of the population genetics of R.
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View Table Favorite Table Download. Please enter User Name Password Error: Moreover, prolonged intestinal transit could increase gallstone risk by enhancing formation in the intestinal lumen of the secondary hydrophobic and pro-lithogenic bile salt deoxycholate. A number of transport proteins are vesiculzres in the process of intestinal cholesterol absorption and might provide links to increased biliary cholesterol supersaturation. Key words Gastrointestinal motility, smooth muscle, cholesterol crystals, gallbladder motility.
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Parasitism of Rhizoctonia solani by strains of Trichoderma spp. Parasitismo de Rhizoctonia solani por linhagens de Trichoderma spp. Directory of Open Access Journals Sweden. Full Text Available Rhizoctonia solani causes serious diseases in a wide range of plant species.