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Alternative fruiting pathways in phycomyces.

R M Thornton1

  • 1Department of Botany, University of California, Davis, California 95616.

Plant Physiology
|February 1, 1972
PubMed
Summary
This summary is machine-generated.

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Phycomyces blakesleeanus exhibits two distinct asexual fruiting body development patterns. Giant and dwarf forms show early developmental differences, impacting final size through varied growth regulation.

Area of Science:

  • Mycology
  • Developmental Biology
  • Genetics

Background:

  • Phycomyces blakesleeanus is a model organism for studying fungal development.
  • Asexual fruiting body development in fungi can exhibit significant morphological variation.

Purpose of the Study:

  • To investigate the developmental distinctions between giant and dwarf fruiting bodies of Phycomyces blakesleeanus.
  • To understand the underlying growth regulation differences between these two forms.

Main Methods:

  • Size measurements and growth analyses of fruiting bodies.
  • Histograms of fruiting body lengths to determine distribution.
  • Comparative analysis of early developmental stages.

Main Results:

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  • Fruiting body lengths showed a bimodal distribution, with peaks for dwarfs (0.3 mm) and giants (30 mm).
  • Early developmental differences were observed: giant apex is tapered, dwarf apex is dome-shaped.
  • Dwarfs cease elongation after sporangium expansion, unlike giants which undergo rapid elongation (stage IV).

Conclusions:

  • Phycomyces blakesleeanus maintains two distinct developmental pathways for asexual reproduction.
  • Giant and dwarf fruiting bodies differ fundamentally in their growth regulation mechanisms.