• Effects of some amino acid analogues on growth and heterocyst formation in the blue-green algaNostoc linckia

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    • Keywords


      L-methionine-DL-sulphoximine; L-methyl-DL-methionine; heterocyst; Nostoc linckia

    • Abstract


      The effects of two amino acid analogues, viz., L-methionine-DL-sulphoximine and L-methyl-DL-methionine on growth, heterocyst differentiation and nitrogen fixation in the blue-green algaNostoc linckia have been studied with special reference to heterocyst spacing pattern. L-methionine-DL-sulphoximine strongly inhibited growth but produced an unusual number of heterocysts with changed heterocyst spacing pattern in both nitrogen-free and ammonium-containing media. L-methyl-DL-methionine was less effective than L-methionine-DL-sulphoximine. An attempt was also made to counteract the toxic effects of these analogues by supplying amino acids. Glutamine and methionine reversed the inhibitory effect of L-methionine-DL-sulphoximine while only methionine reversed the inhibitory effect of L-methyl-DL-methionine. Production of changed heterocyst spacing pattern in nitrogen-free and ammonium-containing media when supplemented with L-methionine-DL-sulphioximine suggests that ammonia may not be the inhibitor of heterocyst spacing pattern.

    • Author Affiliations


      J K Ladha1 2 H D Kumar1

      1. Department of Botany, Banaras Hindu University, Varanasi - 221 005
      2. Department of Biological Sciences, University of Dundee, Dundee - DDI HN, (UK)
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