EFFECTS OF SELECTED PHYSICOCHEMICAL FACTORS ON GROWTH AND ZOOSPOROGENESIS OF CLADOPHORA GLOMERATA (CHLOROPHYTA)1

Authors


  • 1

    Accepted: 29 July 1983.

  • This research was supported by the Davis Fund and the Graduate School, University of Wisconsin-Madison. We thank Dr. S. E. Leurgans for providing assistance with the statistical analyses and Drs. M. S. Adams, G. C. Gerloff, E. H. Newcomb and Mr. L. W. Wilcox for their critical reviews of the manuscript. Mr. C. A. Baum and other members of the Biotron staff were most helpful during the month long experiment. The authors thank Ms. P. A. Klitzke for typing the manuscript.

ABSTRACT

The effects of vitamin B1 and B12, temperature, light intensity and photoperiod on dry weight production and zoosporogenesis of Cladophora glomerata (L.)Kütz. were investigated by factorial experiments. Statistical analysis showed all of the above factors to be significantly (P < 0.01) influenced by these two parameters. Zoosporogenesis appeared to be more sensitive to vitamin limitation than dry weight production. Dry weight production and zoosporogenesis exhibited significantly different maxima. Dry weight production was most strongly influenced by temperature whereas photoperiod exerted the strongest influence on zoosporogenesis. It was possible to experimentally separate the light intensity and photoperiod factors; analysis showed photoperiod to be the primary factor influencing zoosporogenesis. Among the conditions tested, an 8:16 h LD short day photoperiod elicited the greatest number of zoosporangia.

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