Native oak chloroplasts reveal an ancient divide across Europe

C Ferris, RP Oliver, AJ Davy, GM Hewitt

Research output: Contribution to journalArticlepeer-review

155 Citations (Scopus)


Glacial refugia and postglacial migration are major factors responsible for the present patterns of genetic variation we see in natural populations. Traditionally postglacial history has been inferred from fossil data, but new molecular techniques permit historical information to be gleaned from present populations. The chloroplast tRNALeu1 intron contains regions which have been highly conserved over a billion years of chloroplast evolution. Surprisingly, in one of these regions which has remained invariant for all photosynthetic organisms so far studied, we have found intraspecific site polymorphism. This polymorphism occurs in two European oaks, Quercus robur and Q. petraea, indicating hybridisation and introgression between them. Two distinct chloroplast types occur and are distributed geographically as eastern and western forms suggesting that these oaks are each derived from at least two separate glacial refugia.
Original languageEnglish
Pages (from-to)337-343
Number of pages7
JournalMolecular Ecology
Issue number6
Publication statusPublished - Dec 1993

Cite this