Journal
NEW PHYTOLOGIST
Volume 145, Issue 3, Pages 501-509Publisher
WILEY
DOI: 10.1046/j.1469-8137.2000.00594.x
Keywords
ozone resistance; Plantago; RAPD; evolution; population genetics; selection
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Patterns of molecular genetic variation were examined in seed collections of Plantago major and Plantago intermedia, used previously to investigate the variations in ozone (O-3) resistance of these species across Europe. Total genomic DNA was amplified with random primers (random amplied polymorphic DNA (RAPD) and inter-single sequence repeats (SSR)) to produce 73 genetic markers. In addition, allozyme and chloroplast variations were surveyed. Genetic markers were examined for association with O-3 resistance in 18 British populations of P. major as well as 27 continental European populations of P. major and P. intermedia. Two populations that exhibited increased resistance to O-3 following several years' exposure ro high O-3 concentrations in the field showed decreased genetic variation over time. In addition, their genetic composition showed no drastic change, which suggests that the change in resistance to O-3 was probably the result of selection on genotypes already present in local populations (selection in situ). It appears that selection for O-3 resistance may occur in independent populations, and also may involve a number of genetically determined traits. Consequently the finding that plants with similar degrees of O-3 resistance are not closely related was not unexpected. However, the finding of an association of several genetic markers with O-3 resistance merits further investigation.
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