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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.

Mating Type Linked Mutations Which Disrupt the Uniparental Transmission of Chloroplast Genes in Chlamydomonas