Determination of herbicide resistance in aquatic cyanobacteria by probit analysis

Cyanobacteria are a group of bacteria that obtain their energy by photosynthesis and play a significant role in the breakdown of herbicides in nature. in this study,experiments were performed for a period of 15 days with 12 cyanobacteria obtained from different aquatic environments and three herbicides commonly used in agriculture {2,4-dichlorophenoxyacetic acid (2,4-d),trifluralin and linuron}. the herbicides were pipetted at certain concentrations into bg11 broth. the herbicide resistance of the 12 cyanobacteria was determined by using chlorophyll-a measurement,rate of growth assessment,the probit analysis and the results of the lethal concentration test (lc10;50). according to the lc10 values at day 15; the synechocystis sp. strain number 6 in the 2,4-d environment,the synechococcus sp. strain number 41 in the trifluralin environment,and the chroococcus sp. strain number 4 in the linuron environment,were determined to be resistant to the concentrations of herbicide. according to the day 15 values,the synechocystis sp. strain number 6 was determined to be resistant to three different herbicide concentrations in the 2,4-d,trifluralin and linuron environments. since it is a study that contributes to the protection of the environment,we intended for this study to set a new precedent for other studies.