Probit Analysis of Carbamate-Pesticide-Toxicity at Soil-Water Interface to N2-Fixing Cyanobacterium Cylindrospermum sp
Received date: 2014-03-31
Accepted date: 2014-09-30
Online published: 2015-01-27
Toxicity-data of two carbamate insecticides, carbaryl and carbofuran, and three fungicides, ziram, zineb and mancozeb with rice-field N2-fixing cyanobacterium Cylindrospermum sp., obtained by in vitro growth and at soil-water interface, were analyzed by the probit method. Growth enhancing concentration, no-observed effective concentration, minimum inhibitory concentration, the highest permissive concentration and lethal concentration100 (LC100) were determined experimentally. The LC50 values of carbaryl, carbofuran, ziram, zineb and mancozeb in N2-fixing liquid medium were 56.2, 588.8, 0.07, 4.2 and 3.4 µg/mL, respectively, whereas the corresponding LC100 values were 100.0, 1500.0, 0.17, 25.0 and 9.0 µg/mL, respectively. The LC50 values of these pesticides in succession in N2-fixing agar medium were 44.7, 239.9, 0.07, 1.8 and 2.3 µg/mL, respectively, whereas the corresponding LC100 values were 100.0, 600.0, 0.17, 10.0 and 7.0 µg/mL, respectively. Similar results with nitrate supplemented liquid and agar media indicated that nitrate supplementation had toxicity reducing effect. The LC50 and LC100 values of toxicity in the N2-fixing liquid medium at soil-water interface were 91.2 and 200.0 µg/mL for carbaryl, 2 317 and 6 000 µg/mL for carbofuran, 0.15 and 0.50 µg/mL for ziram, 16.4 and 50.0 µg/mL for zineb, and 7.2 and 25.0 µg/mL for mancozeb, respectively. Each LC100 value at soil-water interface with a pesticide was significantly higher than its corresponding LC100 value at liquid/agar media. It can be concluded that, under the N2-fixing conditions, the cyanobacterium tolerated higher levels of each pesticide at soil-water interface.
N. Padhy Rabindra, Rath Shakti . Probit Analysis of Carbamate-Pesticide-Toxicity at Soil-Water Interface to N2-Fixing Cyanobacterium Cylindrospermum sp[J]. Rice Science, 2015 , 22(2) : 89 -98 . DOI: 10.1016/S1672-6308(14)60281-X
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