抄録
Two models with a master circle and without the master circle for endoduplication and separation of mitochondrial(mt)DNA in higher plants are discussed. In these models, mitochondrial DNAs are actively synthesized in mitochondria in meristematic cells while during cell differentiation, mitochondria divide inabsence of DNA synthesis.Finally, in cells of differentiated tissues such as a root cap and an elongation zone, mitochondria contain a smaller amount of DNA than the genome size and their molecules in each mitochondrion are heterogeneous.
