Abstract
Mutations conferring herbicide resistance in 3 mutant strains of the cyanobacterium Synechocystis 6714 have been characterized by gene cloning and sequencing. The mutants display very different phenotypes: DCMU-IIA is DCMU-resistant and atrazine-resistant, DCMU-IIB is DCMU-resistant and atrazine-sensitive, and Az-V is DCMU-sensitive, atrazine-resistant and presents particular photoinhibition properties. These mutants were originally obtained either by one-step selection (DCMU-IIA) or by two-step selection (DCMU-IIB and Az-V). psbA copies carrying herbicide resistance have been identified by transformation experiments as psbAI in all cases. Sequences of the psbAI copy of each mutant have been compared to the wild-type sequence. In the single mutant DCMU-IIA, a point mutation at codon 264 (Ser→Ala) results in resistance to both DCMU and atrazine. In the double mutants DCMU-IIB and Az-V, two point mutations were found. DCMU-IIB was derived from DCMU-IIA and had acquired a second mutation at codon 255 (Phe→Leu) resulting in a slight increase in DCMU resistance and complete abolition of atrazine resistance. Az-V contains two changes at codons 211 (Phe→Ser) and 251 (Ala→Val) resulting in high atrazine resistance but only slight DCMU resistance.
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Abbreviations
- DCMU::
-
3-(3,4-dichlorophenyl)-1,1-dimethylurea
- PSII::
-
photosystem II
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Ajlani, G., Kirilovsky, D., Picaud, M. et al. Molecular analysis of psb A mutations responsible for various herbicide resistance phenotypes in Synechocystis 6714. Plant Mol Biol 13, 469–479 (1989). https://doi.org/10.1007/BF00027307
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DOI: https://doi.org/10.1007/BF00027307