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- W1562549379 abstract "A new method has been developed for screening algal photosynthetic mutants. This method uses autoradiography to assess gross photosynthetic 14C fixation by green algal colonies on agar plates and allows the identification of clones that differ in photosynthetic characteristics from wild-type cells. Three wild-type cells, high-CO2-grown Chlorella ellipsoidea, air-grown C. ellipsoidea, and air-grown Chlorella saccharophila, had K0.5 values for dissolved inorganic carbon (DIC) of 1083, 250, and 50 [mu]M, respectively, and as plaques on agar plates at Chl densities greater than 25 [mu]g cm-2 exhibited relative amounts of 14C fixation of 15, 55, and 100%, respectively. Cells of C. ellipsoidea were mutagenized with x-rays and screened by this method. Growth of C. ellipsoidea in high CO2 represses DIC transport and thus lowers its affinity for DIC. Five of the mutants detected by this method showed high-affinity photosynthesis similar to air-grown wild-type cells even when grown in high CO2. Seven other mutants when grown in high CO2 showed affinities for DIC intermediate between air-grown and high-CO2-grown wild-type cells. The affinities of high-CO2-grown mutants were reflected precisely in their capacities to accumulate DIC intracellularly. These results indicate that the mutants are fully or partially insensitive to the repressive effect of ambient CO2 concentration on DIC transport." @default.
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- W1562549379 date "1996-04-01" @default.
- W1562549379 modified "2023-10-16" @default.
- W1562549379 title "A New Screening Method for Algal Photosynthetic Mutants (CO2-Insensitive Mutants of the Green Alga Chlorella ellipsoidea)" @default.
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- W1562549379 doi "https://doi.org/10.1104/pp.110.4.1283" @default.
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