Mitochondrial DNA sequence divergence among Lycopersicon and related Solanum species

• Published in: Genetics (Austin) Vol. 112; no. 3; pp. 649 - 667
• Main Authors: McClean, P.E, Hanson, M.R
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Genetics Soc America 01.03.1986; Genetics Society of America
• Subjects: ADN; Agronomy. Soil science and plant productions; Biological and medical sciences; Biological evolution; DNA; EVOLUCION; EVOLUTION; Fundamental and applied biological sciences. Psychology; Generalities; Generalities. Genetics. Plant material; Genetics and breeding of economic plants; Genetics of eukaryotes. Biological and molecular evolution; Investigations; Lycopersicon; LYCOPERSICON ESCULENTUM; MITOCHONDRIA; MITOCHONDRIE; MITOCONDRIA; Plant material; SOLANUM; Vegetals; Dicotyledones; Interspecific comparison; Angiospermae; Lycopersicon; Spermatophyta; Mitochondrial DNA; Solanaceae; Phylogeny; Solanum; Polymorphism
• ISSN: 0016-6731; 1943-2631; 1943-2631
• DOI: 10.1093/genetics/112.3.649

Sequence divergence among the mitochondrial (mt) DNA of nine Lycopersicon and two closely related Solanum species was estimated using the shared fragment method. A portion of each mt genome was highlighted by probing total DNA with a series of plasmid clones containing mt-specific DNA fragments from Lycopersicon pennellii. A total of 660 fragments were compared. As calculated by the shared fragment method, sequence divergence among the mtDNAs ranged from 0.4% for the L. esculentum-L. esculentum var. cerasiforme pair to 2.7% for the Solanum rickii-L. pimpinellifolium and L. cheesmanii-L. chilense pairs. The mtDNA divergence is higher than that reported for Lycopersicon chloroplast (cp) DNA, which indicates that the DNAs of the two plant organelles are evolving at different rates. The percentages of shared fragments were used to construct a phenogram that illustrates the present-day relationships of the mtDNAs. The mtDNA-derived phenogram places L. hirsutum closer to L. esculentum than taxonomic and cpDNA comparisons. Further, the recent assignment of L. pennellii to the genus Lycopersicon is supported by the mtDNA analysis.