Summary
We have investigated the inheritance of the mitochondrial DNA (mtDNA) restriction endonuclease digestion patterns of maize inbred line B37N in individual plants and pooled siblings in lineages derived from five separate plants in the third generation following successive self-pollinations. The restriction fragment patterns of the different mtDNA samples were compared after digestion with five endonucleases. No differences were visible in the mobilities of the 199 fragments scored per sample. Hybridization analysis with two different cloned mtDNA probes, one of which contains homologies to a portion of the S2 plasmid characteristic of cms-S maize, failed to reveal cryptic variation. The apparent rate of genomic change in maize mtDNA from inbred plants appears to be very slow, compared with the faster rates of change seen in maize tissue cultures and with the documented rapid rate of inter- and intraspecific variation for mammalian mtDNA.
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Communicated by P. L. Pfahler
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Oro, A.E., Newton, K.J. & Walbot, V. Molecular analysis of the inheritance and stability of the mitochondrial genome of an inbred line of maize. Theoret. Appl. Genetics 70, 287–293 (1985). https://doi.org/10.1007/BF00304913
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DOI: https://doi.org/10.1007/BF00304913