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GROWTH AND MATING OF GONIUM PECTORALE (VOLVOCALES) IN DEFINED MEDIA(1)
1Department of Botany, University of British Columbia, Vancouver, Canada.
Abstract:
Growth in defined media of 32 populations of Gonium pectorale was studied to learn more about the sexual isolation reported for this species. The 23 populations containing both mating types (+ & -) icere also studied for the ability to form zygotes in defined media. A preliminary study showed that some populations grew and reproduced sexually in a defined mineral medium, whereas others appeared to require exogenous organic materials for growth and/or zygote formation. The diverse reactions exhibited by the populations indicate physiological races which may explain, in part, the occurrence of sexual isolation.
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