Toxicity of β-(1→3,1→6)-ᴅ-glucans produced by diaporthe sp. endophytes on metarhizium anisopliae (metschnikoff) sorokin assessed by conidia germination speed parameter

Made available in DSpace on 2020-12-12T01:35:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-09-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) We have previously reported that β-(1→3,1→6)-ᴅ-glucans produced by endophytes Diaporthe sp. G27-60 and G65-65 (GenBank accession codes JF766998 and JF767007, respectively) are promising anti-proliferation agents against human breast carcinoma (MCF-7) and hepatocellular carcinoma (HepG2-C3A) cells. However, the literature fails to describe the effects of Diaporthe exopolysaccharides (EPS) on eukaryotic healthy cells. The fungus Metarhizium anisopliae has been employed as model-system to evaluate the toxicity of pharmaceutical and agricultural-interest substances, taking into account, among other parameters, the speed of conidia germination. Current study verified the effect of different concentrations of Diaporthe β-glucans on the germination speed of M. anisopliae. Conidia were incubated with β-glucans treatments (50, 200 and 400 μg/mL) at 28ºC, sampled during 24 h and analyzed by light microscopy. At the end of a 24-h incubation, the amount of germinated conidia reached ≈99% for controls and ranged between 97.7 and 98.6% for treatments. Bayesian analysis indicated that Diaporthe glucans had no toxicity on M. anisopliae and the curve of germination occurred as expected for this fungal strain. Considering the validity of filamentous fungi as model-systems, results are important data on the toxicity of endophytic EPS on healthy cells and may be associated with our previous results obtained for these polymers against tumor cells. Universidade Estadual de Maringá (UEM) Universidade Católica Dom Bosco (UCDB) University of Georgia (UGA) Faculdade de Ciências e Tecnologia Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP) Escola Superior de Agricultura Luiz de Queiroz (ESALQ/USP) Núcleo Permanente Docente do Programa de Pós-graduação em Biotecnologia Ambiental da Universidade Estadual de Maringá (UEM) Faculdade de Ciências e Tecnologia Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP) CNPq: 311534/2014-7 CNPq: 447265/2014-8