Characterization of three herbicide-resistant strains of the unicellular green alga, Monoraphidium pusillum, 3: Determination of the resistance mechanism by luminescence
1992
Lundegaardh, B. (Sveriges Lantbruksuniv., Uppsala (Sweden). Inst. foer Vaextodlingslaera)
Luminescence studies were performed to investigate if there were any alterations in the electron transport chain of three mutants, one resistant to atrazine (AT-r), one to bentazone (Be-r) and one to DCMU (Di-r), of Monoraphidium pusillum (PRINTZ). The total amount of photons emitted as luminescence was lower in old cells of the three mutants and in young Di-r cells than in corresponding Wt cells. Cells of the At-r and Di-r strains emitted a larger proportion of the total photons earlier after termination of the light than Wt cells, whereas Be-r cells showed a more drawn-out emission of photons than Wt cells. Furthermore, the intermediate transient peak 40-60 s after termination of 700 nm light was absent in the mutants. The present data indicate the occurrence of an altered electron transport, a slower induction of the CO2-fixation and phosphorus deficiency in cells of the mutants of M. pusillum. Moreover, cells of the Be-r strain may have some alteration of the function of the chloroplastic ATPas.
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