By: J. I. Nirmal Kumar, Manmeet Kaur Amb &
Anubhuti Bora
An extensive usage of fungicides in various tropical and subtropical
countries to control various fungal infections adversely affects the growth of
microflora, including cyanobacteria. Toxic effect of
1-(4-chlorobenzyl)-1-cyclopentyl-3-phenylurea (trade name pencycuron), a
non-systemic protective fungicide recommended for controlling sheath blight of
rice on Westielliopsis prolifica, an abundant cyanobacterium found in rice
(Oryza sativa L.) fields, was studied under laboratory conditions. Photopigments
and stress metabolites like carbohydrates, proteins, amino acids and phenol
content were measured across 16 days at 4-day intervals. Nitrate reductase and
glutamine synthetase activities were also measured. The results revealed that
pencycuron exerted unfavorable effects on the selected
cyanobacterium at 100 and 200 ppm. Chlorophyll-a, carotenoids, phycoerythrin,
amino acid, and enzyme activities were more adversely affected by pencycuron
than other parameters, such as total carbohydrates, proteins, and phenols. The
results support the suggestion that the physiological mode of pencycuron
toxicity to W. prolifica is related to its interference with the metabolic and
enzymatic reactions. For this reason, use of pencycuron should be prohibited in
rice fields.Yangzhou pioneer chemical CO.,LTD |
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