Abstract
The content of bounded amino acids in six entomopathogenic fungi was identified and determined. Analyzing the elements characterizing the pathogenicity of individual species of fungi based on infectivity criteria, ranges of infected hosts, and the ability to induce epizootics, these can be ranked in the following order: Isaria farinosa, Isaria tenuipes, Isaria fumosorose, Lecanicillium lecanii, Conidiobolus coronatus, Isaria coleopterorum. These fungi represent two types of Hyphomycetales-Paecilomyces Bainier and Verticillium Nees ex Fr. and one type of Entomophtorales-Conidiobolus Brefeld. Our study indicates that there are significant quantitative and qualitative differences of bounded amino acids in the entomopathogenic fungal strains contained in the mycelium between high and low pathogenicity strains. The richest composition of bounded amino acids has been shown in the mycelium of the Isaria farinosa strain, which is one of the most commonly presented pathogenic fungi in this group with a very wide range of infected hosts and is the most frequently recorded in nature as an important factor limiting the population of insects.
Highlights
Plant pathogens created by insects significantly reduce crop yields
The largest number of amino acids was isolated from the mycelium strain of Isaria farinosa (Paecilomyces farinosus), wherein the four compounds: cysteine, methionine, β-alanine and β-aminobutyric acid do not occur in any of the other tested strains. This may suggest that their presence in the composition of the fungus metabolites affects the scope of its affinity for the host pathogenic because both the number and taxonomic differentiation of arthropods infected by Isaria farinosa (Paecilomyces farinosus) are the greatest of all the tested strains
A high-resolution column packed with Ostion LGFA of Amino Acid Analyzer and the system of lithium-cytric buffers is recommended for the separation and determination of the larger number of amino acids −24 in mycelium hydrolysates
Summary
Plant pathogens created by insects significantly reduce crop yields. These pathogens strongly impact the epidemiology of a plant disease. If we want to decrease use of pesticides, we should offer alternative ways to resolve the problem of pest damage. The choice of an effective method depends on our knowledge of the pests0 biology and their behavior. Physiology to decline the damage they cause. The knowledge of insect ecology should help us identify the processes and mechanisms of insect response, which help us to propose new methods and tools that effectively decrease that response
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