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Physiological Variation between the Generations and Among the Strains of Watermolds in the Subgenus Euallomyces

Leonard Machlis and Jean M. Crasemann
American Journal of Botany
Vol. 43, No. 8 (Oct., 1956), pp. 601-611
Stable URL: http://www.jstor.org/stable/2438876
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Physiological Variation between the Generations and Among the Strains of Watermolds in the Subgenus Euallomyces
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Abstract

The gametophytic and sporophytic generations of selected isolates of watermolds in the subgenus Euallomyces were found to have the same nutritional requirements, linear growth rates in liquid culture, and abilities to grow on the same amino acids as nitrogen, carbon, and nitrogen and carbon sources. The two generations differed only in that the gametophytes of 9 of the 10 strains compared had longer lag phases than the corresponding sporophytes. Seventeen strains of Euallomyces were compared with respect to the growth of the gametophytes on yeast agar slants, gamete formation and behavior, growth of the sporophyte in liquid culture, and nature and extent of rhizoidal and meiosporangial development. The strains were selected to include from A. arbuscula eight with n = 16, and one each with n = 8, 24, and 32 and from A. macrogynus three with n = 28, one each with n = 14 and 56, and one with n unknown. The variations observed are discussed in relation to the present systematic treatment of the subgenus and the available cytogenetic information.

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