Biparental inheritance of chloroplast DNA and the existence of heteroplasmic cells in alfalfa [Medicago sativa]

Mapping of chloroplast DNA (ctDNA) restriction fragment patterns from a chlorophyll deficient mutant and two phenotypically normal alfalfa genotypes (Medicago sativa L.) has demonstrated the existence of a distinct ctDNA genotype from each source. These unique restriction fragment patterns were util...

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Bibliographic Details
Published in:Theoretical and applied genetics 1988-10, Vol.76 (4), p.545-549
Main Authors: LEE, D. J, BLAKE, T. K, SMITH, S. E
Format: Article
Language:English
Subjects:
adn
Biological and medical sciences
citologia
Classical genetics, quantitative genetics, hybrids
cytologie
cytology
cytoplasmic inheritance
dna
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
heredite cytoplasmique
herencia citoplasmatica
Medicago sativa
plaste
plastidios
plastids
Pteridophyta, spermatophyta
Vegetals
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Summary:Mapping of chloroplast DNA (ctDNA) restriction fragment patterns from a chlorophyll deficient mutant and two phenotypically normal alfalfa genotypes (Medicago sativa L.) has demonstrated the existence of a distinct ctDNA genotype from each source. These unique restriction fragment patterns were utilized to identify maternal or paternal origin of ctDNA in hybrid plants from crosses involving the normal alfalfa genotypes as females and the yellow-green chlorophyll deficient sectors as males. Progeny from these crosses expressing the yellow-green sectored phenotypes contained paternal ctDNA in the chlorophyll deficient sectors and maternal ctDNA in the normal sectors, confirming biparental plastid inheritance. The existence of mixed cells containing both mutant and normal plastids at various stages of sorting-out was observed by transmission electron microscopy of mesophyll cells in mosaic tissue from hybrid plants. This observation verified the biparental transmission of plastids in alfalfa.
ISSN:0040-5752
1432-2242
DOI:10.1007/BF00260905