Effect of some fungal and bacterial antagonists on broad been pathogens

Akbaibavafagelyan, F. (2017) Effect of some fungal and bacterial antagonists on broad been pathogens. Masters thesis, university of zabol.

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One of the effective methods for controlling plant diseases is the use of fungal and bacterial antagonistic agents with pathologic properties. The effect of biological agents on the control of bean diseases has been less studied. In this study, the effects of Trichoderma virens and Trichoderma longibrachiatum and bacteria Pseudomonas fluorescens and Bacillus subtilis on Sclerotinia sclerotiorum, Macrophomina phaseolina and Botrytis fabae were studied under laboratory and greenhouse conditions. All antagonistic agents in laboratory conditions showed a favorable inhibitory effect on the growth of pathogenic agents. At the same time, Trichoderma isolates had a better effect. Laboratory investigations were carried out in two ways: intercropping of Trichoderma antagonistic agents and pathogens, and three-point cultivation of antagonistic bacteria and pathogens, as well as the effects of esophageal antagonistic agents on pathogens. The results showed that Trichoderma species had the same effect on the control of the S. sclerotiorum patient, but over time, T. virens had a more favorable effect with a mean inhibitory effect of 54.43, 73.81 and 92.13 in three time intervals. Also, P. fluorescens and B. subtilis were able to control the S. sclerotiorum patient with a mean inhibitory of 60.58% and 60% respectively. Both Trichoderma species managed to control the M. phaseolina patient 100% and cover the surface of the petri dish. Also, P. fluorescens and B. subtilis antagonistic bacteria prevented the growth of M. phaseolina with inhibitory activity of 75 and 68.5%, respectively. Trichoderma longibrachiatum could effectively control the B. fabae patient. Also, P. fluorescens and B. subtilis had a similar effect. Volatile compounds T. Virens against the M. phaseolina, T. longibrachiatum patient against S. sclerotiorum and P. fluorescens against B. fabae were more effective than any other antagonists against each patient. The antagonistic agents were able to control M. phaseolina in the greenhouse well. The S. sclerotiorum patient was also controlled by all of the antagonists, but did not show any significant difference in comparison with the control. Both Trichoderma species, especially T. longibrachiatum, were able to control the B. fabae pathogen in the greenhouse. Both P. fluorescens and B. subtilis antagonistic bacteria had a lower effect on infections of 50-36% and 35- 21%, respectively. In general, the control of the B. fetaea fungus was less successful than the two patients with M. phaseolina and S. sclerotiorum.

Item Type: Thesis (Masters)
Uncontrolled Keywords: biological control, biological control, inhibitor of growth
Subjects: Q Science > QR Microbiology
S Agriculture > SB Plant culture
Depositing User: Mrs najmeh khajeh
Date Deposited: 15 Oct 2018 09:43
Last Modified: 06 Mar 2019 07:21
URI: http://eprints.uoz.ac.ir/id/eprint/2195

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