Condition for Bread Molds to Grow
Bread molds grow from spores when under high temperature and humidity. Spores can also reproduce under the cold condition of a refrigerator, but they become dormant at their freezing point. Though they might be dormant for some time, they start to grow and reproduce again when exposed to heat.
To investigate the effect of temperature and humidity on the growth of bread molds, we had done experiments and wrote laboratory reports to show our findings.
Spread and Reproduction of Bread Molds
Bread molds spread by asexual or sexual reproduction. In asexual reproduction, sporangia which form at the tip of sporangiophores are filled with haploid nucleus and cytoplasm. When columnella forms, sporangia are separated from the sporangiophores. Each nucleus, originally inside the sporangia, forms a haploid spore with cytoplasm. Wind disperses these spores, which then germinate and form new mycelia.
In sexual reproduction, if mycelia of opposite strains of bread mold are close, their hyphae grow towards each other. When the tips of the hyphae touch, the nuclei of the opposite strains fuse in pairs (fertilization), forming a diploid zygospore. These spores are then dispersed by wind, and then germinate, forming a new mycelium.
Process of Asexual and Sexual Reproduction