Genetics of Gracilaria sp. (Rhodophyceae, Gigartinales). V. Isolation and characterization of mutant strains

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Abstract
Mutant strains of Gracilaria sp. were isolated as part of a programme evaluating the potential of this red alga for genetic studies. Some mutants with morphological or pigmentation changes were obtained spontaneously but hundreds more were Isolated after mutagenesis with ethyl methanesulphonate. Many variants were crossed reciprocally with wild type and showed Mendelian, single-gene transmission patterns. Most were recessive, but incomplete and complete dominance were also encountered. Preliminary characterization of some of the mutant pigmentation phenotypes revealed dramatic changes in pigment composition, suggesting that these mutants would be valuable for further studies on red algal chloroplast organization and function.

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