: Current study looked into how well microorganisms, both those already known and newly found, from the surface of plants in gardens in southern and southeastern Kazakhstan could fight against other harmful microbes. We evaluated the effectiveness of 16 strains of lactic acid bacteria, 11 strains from the Bacillus and Pseudomonas genera, and 7 strains of Trichoderma fungi (all sourced from SPC Microbiology and Virology LLP), along with 135 epiphytic microorganisms, against four major rot-causing pathogens: Penicillium chrysogenum, Monilinia fructigena, Alternaria alternata, and Fusarium sporotrichioides. Out of 16 lactic acid bacteria strains, 11 showed antagonistic activity, primarily against M . fructigena, and to a lesser extent, other pathogens. Lactobacillus casei 32 exhibited the strongest inhibitory effect. Among the bacterial cultures screened, only the Bacillus amyloliquefaciens strain was found to suppress the growth of specific pathogens. Among the 7 fungal strains of the genus Trichoderma , 4 had significant antagonistic activity. The maximum zone of pathogen suppression was found in the strain T. asperellum 30. Screening of potential antagonist microorganisms from microbial populations isolated from the surface of apple fruits revealed that only 1 isolate of the bacterial flora had inhibitory activity against the pathogen M. fructigena . The following microorganisms with maximum antagonistic activity are promising biocontrol agents against fruit rot: Lactobacillus casei 32, B. amyloliquefaciens and T. asperellum 30 .
E. Ismailova, N. Kuldybayev, G. Baimakhanova et al.· OnLine Journal of Biological...· 0 citations
. Abstract: Root rot remains one of the most significant diseases of winter wheat ( Triticum aestivum L.) in Kazakhstan, resulting in substantial yield losses. This study aimed to isolate and identify rhizosphere microorganisms associated with winter wheat and evaluate their antagonistic activity against root rot pathogens in the Almaty region of Kazakhstan. In total, seven bacterial and fungal isolates, belonging to the genera Bacillus , Lysinibacillus, and Trichoderma, were identified. Strain K-C-24 showed 99.87% homology with Bacillus mojavensis . Trichoderma asperellum strains GL and 101 showed the highest antagonistic activity, effectively inhibiting the growth of all tested pathogens, with inhibition reaching zones up to 37 mm. Bacterial strain K-C-24 ( B. mojavensis ) was active against Bipolaris sorokiniana with an inhibition zone of 23.5±0.5 mm, and its culture filtrate showed a strong inhibitory effect on F. oxysporum (42±0.5 mm), but showed no activity against other pathogens. Other isolates showed no significant antagonistic activity. The greenhouse experiment demonstrated the lowest rates of damage to the roots of wheat seedlings infected by F. oxysporum when treated with a consortium of bacteria from the genera Bacillus and Lysinibacillus (Mix bac) and the strain T. asperellum GL. The obtained results confirm the potential of using local antagonist strains, especially T. asperellum, B. mojavensis, and a consortium of bacteria, Bacillus and Lysinibacillus (Mix bac) strains, for the development of environmentally safe biopreparations against root rot of winter wheat in the Almaty region of Kazakhstan.
N. Kuldybayev, A. Sadanov, A. Qairatova et al.· OnLine Journal of Biological...· 0 citations
Findings highlight the potential of indigenous rhizosphere microorganisms as biological control agents for the management of wheat root rot pathogens and identify the Bacillus strain showing the strongest growth-promoting effect.
N. Kuldybayev, A. Sadanov, G. Baimakhanova et al.· Brazilian Journal of Biology· 0 citations
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