Single copy DNA homologies in Atriplex. I. cross reactivity estimates and the role of deletions in genome evolution

Summary Genome sizes and single copy complexity values have been estimated for eight Atriplex species and spinach by analysis of DNA reassociation kinetics. These values, together with measurements of interspecific hybridization carried out with purified single copy tracers, have been used to estima...

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Bibliographic Details
Published inHeredity Vol. 46; no. 1; pp. 91 - 108
Main Authors Belford, H, Thompson, W.F
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 01.02.1981
Subjects
Biomedical and Life Sciences
Biomedicine
Cytogenetics
Ecology
Evolutionary Biology
Human Genetics
original-article
Plant Genetics and Genomics
spinach
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Summary:Summary Genome sizes and single copy complexity values have been estimated for eight Atriplex species and spinach by analysis of DNA reassociation kinetics. These values, together with measurements of interspecific hybridization carried out with purified single copy tracers, have been used to estimate the absolute amount of single copy DNA which is composed of homologous sequences in various species. The data show a large variation in cross reactivity for different species pairs which is best explained by postulating that these genomes were subject to extensive deletion during evolution of different lineages. At most, only about 5 × 10 7 nucleotide pairs of single copy DNA (about 10 times the amount in an E. coli genome) appear to be necessary to specify phenotypic features common to Atriplex species.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0018-067X
1365-2540
DOI:10.1038/hdy.1981.9