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Mutations affecting sexual development in Phycomyces blakesleeanus.

R P Sutter

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1975
    PubMed
    Summary
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    Chemical messengers from one mating type of P. blakesleeanus stimulate zygophore development in the opposite mating type. This discovery clarifies the sexual reproduction signaling in this fungus.

    Area of Science:

    • Mycology
    • Fungal Genetics
    • Sexual Reproduction

    Background:

    • Zygospore formation in P. blakesleeanus is essential for sexual reproduction.
    • Previous studies indicate complex genetic regulation of sexual development.

    Purpose of the Study:

    • To investigate the role of chemical signaling in zygophore development.
    • To understand the interaction between mating types and carotene synthesis mutants.

    Main Methods:

    • Culturing P. blakesleeanus on agar medium for morphological observation.
    • Cross-mating experiments involving wild-type and carotene synthesis mutants.
    • Observing zygophore formation and development patterns.

    Main Results:

    • Zygophores develop prior to contact and undergo six stages to form zygospores.

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  • Mutants with altered carotene synthesis display abnormal sexual behavior.
  • Specific mating type interactions reveal directional zygophore development, suggesting chemical signaling.

    • Conclusions:

    • Each P. blakesleeanus mating type produces a chemical signal.
    • This signal is crucial for inducing zygophore development in the opposite mating type.
    • Carotene synthesis pathways are linked to sexual signaling in P. blakesleeanus.