| Congresso Brasileiro de Microbiologia 2023 | Resumo: 1316-1 | ||||
Resumo:Endophytic microorganisms are characterized by living inside plant tissues without causing apparent symptoms in their hosts. Endophytic microorganisms can produce secondary compounds due to their metabolic activities, which have potential benefits to plants such as better host development and defense against herbivore and pathogen attack. An example of microorganisms known for their endophytic habit are fungi belonging to the genus Nemania, reported in several hosts and with potential production of secondary compounds with
biotechnological interests. Some fungi also have economic importance due to their pathogenicity on cultivars. An example is Penicillium digitatum, responsible for the green mold, which leads to important losses in the production of citrus fruits. Another phytopathogen is Monilinia fructicola, responsible for the brown rot in stone fruits, such as peach and plum. White mold, caused by Sclerotinia sclerotiorum, is responsible for affecting several crops and its control is difficult due to the formation of resistant structures that remain in the soil for long periods. Fungus of the genus Fusarium, such as Fusarium graminearum and Fusarium
verticillioides, are responsible for causing rot (fusariosis) in structures, as rootlets and stems of different crops. This work aimed to analyze the antagonistic potential of isolates 28F1 and 38F4 of Nemania sp. against these phytopathogens with in vitro antagonism test, where inhibitions were observed through deadlock and replacement in isolate 28F1, and deadlock
type in isolate 38F4. The highest inhibition rates observed were against the phytopathogens M. fructicola and P. digitatum, with values of 76% and 61%, in the test with isolate 28F1, and 88% and 68%, in the test with isolate 38F4, respectively. No signals of inhibition by volatile
compounds were observed, which suggests that the antagonism is due to the production of secondary compounds released into the culture medium or competition for resources. The isolates were promising in terms of inhibiting the development of phytopathogens, however more tests are needed to understand how this occurs and what is its potential for use in biological control. Palavras-chave: biological control, inhibition tests, Monilinia fructicola, Penicillium digitatum Agência de fomento:CNPq (National Council for Scientific and Technological Development) | |||||