• Effect of 7-azatryptophan on heterocyst differentiation inAnabaena doliolum Bharadwaja

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    • Keywords


      7-azatryptophan; heterocyst; differentiation; Anabaena doliolum

    • Abstract


      The effect of DL-7-azatryptophan, an analogue of tryptophan, has been studied on the heterocyst spacing pattern and the probability of proheterocyst regression inAnabaena doliolum. 7-azatryptophan suppressed growth and induced heterocyst differentiation in nitrogen-free medium. In ammonium (1 mM), nitrite (2 mM) and nitrate (2 mM) supplemented media, it caused proheterocyst regression with a frequency of 100%, 35% and 10% respectively. The role of azatryptophan in nitrogen metabolism has been discussed in relation to ammonia-uptake study.

    • Author Affiliations


      Manju Agrawal1 H D Kumar1

      1. Department of Botany, Banaras Hindu University, Varanasi - 221 005
    • Dates


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