RAPID DISAPPEARANCE OF ONE PARENTAL MITOCHONDRIAL GENOTYPE AFTER ISOGAMOUS MATING IN THE MYXOMYCETE PHYSARUM-POLYCEPHALUM

被引:43
作者
MELAND, S [1 ]
JOHANSEN, S [1 ]
JOHANSEN, T [1 ]
HAUGLI, K [1 ]
HAUGLI, F [1 ]
机构
[1] UNIV TROMSO,INST MED BIOL,DEPT CELL BIOL,POB 977,N-9001 TROMSO,NORWAY
关键词
PHYSARUM; MITOCHONDRIAL DNA; INHERITANCE;
D O I
10.1007/BF00362088
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Five haploid amoebal strains of the myxomycete Physarum polycephalum, each with a distinct mitochondrial genotype, were crossed in all pairwise combinations. The mitochondrial genotype in the diploid plasmodia resulting from these isogamous matings were found to be transmitted uniparentally. This uniparental inheritance could be arranged in a dominant hierarchical order. Time-course analysis of the presence of mitochondrial genotype is virtually completed during the first two nuclear cycles in the zygote/differentiating plasmodium. To our knowledge this is the first report indicating an active mechanism involving the degradation of mitochondrial genomes in sexual crosses.
引用
收藏
页码:55 / 60
页数:6
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