Gamma-irradiated Aspergillus conidia show a growth curve with a reproductive death phase.

ABSTRACT: In this study, we evaluated the effects of gamma irradiation on the germination of Aspergillus conidia and mycelial growth using microscopy and predictive microbiological modeling methods. A dose of 0.4 kGy reduced the germination rate by 20% compared to the untreated control, indicating interphase death due to the high radiation dose. The number of colonies formed (5.5%) was lower than the germination rate (69%), suggesting that most colonies died after germination. Microscopic observations revealed that mycelial elongation ceased completely in the middle of the growth phase, indicating reproductive death. The growth curves of irradiated conidia exhibited a delayed change in the growth pattern, and a decrease in slope during the early stages of germination and growth at low densities. A m

SUBMITTER: Horikiri S 

PROVIDER: S-EPMC10803171 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature