Genetics of Gracilaria sp. (Rhodophyceae, Gigartinales) III. Non-Mendelian gene transmission

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Abstract
Three mutations, one pink, one yellow and one green, arose as somatic sectors on plants of Gracilaria sp. being grown in culture. Wild-type plants are brown to reddish brown. All three mutations were transmitted in a non-Mendelian fashion in crosses, which is in contrast to other pigmentation mutants that have shown Mendelian inheritance. Tetrasporophytes obtained from reciprocal crosses between wild type and these three mutants had the phenotype of the maternal parent. Paternal transmission of either the wild or mutant phenotype was not observed among the several thousand progeny examined. These results indicate that Gracilaria sp. has cytoplasmic as well as nuclear genes that affect the plastid phenotype and that the former are transmitted maternally.

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