Action of 2,4-dichlorophenoxyacetic acid and rifampicin on heterocyst differentiation in the blue-green alga,Nostoc linckia |
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Authors: | D N Tiwari A K Pandey A K Mishra |
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Institution: | (1) Centre for Advanced Study in Botany, Banaras Hindu University, 221 005 Varanasi |
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Abstract: | 2,4-Dichlorophenoxyacetic acid, a commonly used herbicide, increased the growth of the filamentous blue-green alga,Nostoc linckia at doses upto 100 μg /ml. The herbicidetreated N2-cultures showed enhanced heterocyst frequency and N2-growth. Thus, the herbicide stimulated algal growth at the expense of molecular nitrogen under aerobic growth conditions.
Rifampicin caused chain formation of heterocysts. This was effectively counteracted by 2,4-dichlorophenoxyacetic acid, suggesting
a biological interaction between them at the level of the heterocyst spacing control mechanism. |
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Keywords: | Blue-green alga heterocyst differentiation N2-growth rifampicin 2 4-dichlorophenoxyacetic acid |
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