Mating type linked mutations which disrupt the uniparental transmission of chloroplast genes in chlamydomonas.
In Chlamydomonas reinhardtii, chloroplast genomes are normally transmitted by the mating type plus (mt+) parent and mitochondrial genomes by the mating type minus (mt-) parent. In this paper we describe three new nuclear mutations, designated mat-3-1 to -3, which are tightly linked to the mt+ allele and permit high transmission of chloroplast genomes from the mt- parent, but have no effect on transmission of mitochondrial genomes. We also show that mat-1, reported by others to be a nuclear mutation linked to mt- which promotes transmission of chloroplast genomes by the mt- parent, is probably a vegetative diploid since it contains both mt+ and mt- alleles. Vegetative diploids behave as if they are mt- with respect to mating, but possess a level of chloroplast gene transmission intermediate between that of haploid mt- and mt+ stocks.
D002696:Chlamydomonas / Q000235:genetics* / Q000502:physiology; D002736:Chloroplasts / Q000502:physiology*; D003433:Crosses, Genetic; D005796:Genes; D005838:Genotype; D009154:Mutation; D010641:Phenotype