Santosh Kumar Singh , Satish Kumar Verma , Md. Aslam Siddiqui , Devendra Singh , Brij Mohan Sharma

Abstract

Cyanobacteria are a group of diverse Gram-negative organisms that are one of the most primitive photosynthesizes. Attention is drawn towards the alterations in physlogical chances in cyanobacteria exposed to pesticides stress. Synechococcus cultures were exposed to various concentration of the herbicide hexazinone and the tolerant cyanobacteria were used to study the alterations in antioxidant activities, growth and lipid peroxidation levels. All parameters showed a high degree of susceptibility towards high doses of hexazinone. Recovered cyanobacteria showed lower MDA content and super oxide and peroxide radicals. The present findings suggested that high concentration of Hexazinone might modulate the antioxidative system of Synechococcus spp. A significant conclusion can be drawn from the findings that improved tolerance to herbicide stress may be accomplished by increased capacity of antioxidant system of cyanobacteria.

Keywords

Hexazinone, Ascorbate, Lipid Peroxidation, Active Oxygen Species

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Brij Mohan Sharma

Abstract

The paper describes the ecology of Calolropis procera R. Br. The plant has been observed to grow mainly in coarse sandy and alkaline soils. The amount of different cations at various depths has been mentioned.Foliar analysis reveals that the plant is poor in minerals. Root studies show that the dune plants are more branched than those growing on the sandy plains. The proportion of ischolar_main to shoot is considerable.An attempt has also been made to determine the relationship between the mineral contents of its healthy leaves and quantity of available nutrients. It has been found that foliar calcium and nitrogen increase with a corresponding increase of these elements in the soli.

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