Tiwari, D NPandey, A KMishra, A K2015-07-202015-07-201981-03Tiwari D N, Pandey A K, Mishra A K. Action of 2,4-dichlorophenoxyacetic acid and rifampicin on heterocyst differentiation in the blue-green alga, Nostoc linckia. Journal of Biosciences. 1981 Mar; 3(1): 33-39.http://imsear.searo.who.int/handle/123456789/1600842,4-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.enBlue-green algaheterocyst differentiationN2–growthrifampicin2,4-dichlorophenoxyacetic acidArticle