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Effects of gibberellic acid (GA) on laboratory cultures ofTrichodesmium erythraeum (Ehr.) andMelosira sulcata (Ehr.)

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Proceedings / Indian Academy of Sciences

Abstract

Effects of GA onT. erythraeum andM. sulcata have been studied in laboratory cultures maintained in light and in total darkness.

Normally, the interval between successive cell divisions was about 12–17 hours in the case ofT. erythraeum and 15–23 hours in the case ofM. sulcata. Addition of GA to the cultures accelerated the rate of division and the interval between successive divisions was reduced to 4–8 hours in the case ofT. erythraeum and 7–14 hours in the case ofM. sulcata.

In the case ofT. erythraeum the optimum dose of 2·0 mg./l. increased the initial population of 66 cells/10 ml. to 672 cells in seven days, and forM. sulcata the optimum dose was 1·0 mg./l. which increased the initial population of 55 cells/10 ml. to 364 cells in six days.

The cultures grown in total darkness did not show any significant difference from the control cultures.

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Authors and Affiliations

  1. U.G.C. Centre for Advanced Study and Research in Marine Biology, Porto Novo

    V. D. Ramamurthy & R. Seshadri

Authors
  1. V. D. Ramamurthy
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  2. R. Seshadri
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Communicated by Prof. R. V. Seshaiya,f.a.sc.

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Ramamurthy, V.D., Seshadri, R. Effects of gibberellic acid (GA) on laboratory cultures ofTrichodesmium erythraeum (Ehr.) andMelosira sulcata (Ehr.). Proc. Indian Acad. Sci. 64, 146–151 (1966). https://doi.org/10.1007/BF03052128

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  • DOI: https://doi.org/10.1007/BF03052128

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