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Characterization of the adaptation response ofAnacystis nidulans to growth in the presence of sublethal doses of herbicide

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Abstract

Cells of the cyanobacterium,Anacystis nidulans, were cultured in the presence of sublethal doses of the herbicides DCMU [3-(3,4-dichlorophenyl)-1, 1-dimethylurea] and terbutryn (a triazine). The responses observed were characteristic of photosynthetic organisms grown under low light conditions. The contents of the accessory pigment phycocyanin increased in relation to chlorophyll. Moreover, each dose of herbicide was correlated with defined changes in the pigment profile. Data obtained from chlorophyll fluorescence measurements indicated that the additional phycocyanin was functionally integrated into phycobilisomes, probably into newly formed phycobilisomes. The concentration of fatty acids in the total polar lipid fraction (per milligram chlorophyll) was greater in adapted than in control cells; nevertheless, the ratio of unsaturated to saturated fatty acids remained unchanged. Measurable rates of photosynthetic electron transport were similar among herbicide-adapted cultures and controls. These data are consistent with the hypothesis that herbicide treatment impaired electron transport, but that function was restored by the adaptation response. Furthermore, this response is conserved among cyanobacteria and higher plants, indicating that this flexibility is extremely significant to photosynthetic function.

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Hatfield, P.M., Guikema, J.A., St. John, J.B. et al. Characterization of the adaptation response ofAnacystis nidulans to growth in the presence of sublethal doses of herbicide. Current Microbiology 18, 369–374 (1989). https://doi.org/10.1007/BF01571130

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