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TEMPERATURE AND LIGHT INTENSITY EFFECTS ON GROWTH OF DICTYOSPHAERIUM PULCHELLUM
Author(s) -
Ragsdale Harvey L.,
Clebsch Edward E. C.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09812.x
Subject(s) - biology , light intensity , population , botany , growth rate , chlorophyll , zoology , chlorophyll a , optics , physics , demography , geometry , mathematics , sociology
Growth rate and morphological characteristics of Dictyosphaerium pulchcllum were observed from populations maintained at 20 and 25 C under light intensities varying from 100 to 1200 ft‐c. Growth rates, expressed as the number of times the population doubled in chlorophyll content per day, were 0.57 (100 ft‐c) and 1.71 (1200 ft‐c) at 20 C and 0.80 (100 ft‐c) and 2.S7 (1200 ft‐c) at 25 C. Cell size varied between 3.0 and 7.0 μ among all treatments at 20 C and mean cell size increased with an increase in light intensity. Agitation of asexually reproducing populations resulted in up to 95% of a population occurring in a unicellular form. The percentage of uni‐cells was highest in vigorously agitated test tube cultures.