Evidence of intense chromosomal shuffling during conifer evolution
Language
en
Article de revue
This item was published in
Genome Biology and Evolution. 2015, vol. 7, n° 10, p. evv185
Society for Molecular Biology and Evolution
English Abstract
While recent advances have been gained on genome evolution in angiosperm lineages, virtually nothing is known about karyotype evolution in the other group of seed plants, the gymnosperms. Here we used high density gene-based ...Read more >
While recent advances have been gained on genome evolution in angiosperm lineages, virtually nothing is known about karyotype evolution in the other group of seed plants, the gymnosperms. Here we used high density gene-based linkage mapping to compare the karyotype structure of two families of conifers (the most abundant group of gymnosperms) separated around 290 million years ago: Pinaceae and Cupressaceae. We propose for the first time a model based on the fusion of 20 ancestral chromosomal blocks that may have shaped the modern karyotpes of Pinaceae (with n=12) and Cupressaceae (with n=11). The considerable difference in modern genome organization between these two lineages contrasts strongly with the remarkable level of synteny already reported within the Pinaceae. It also suggests a convergent evolutionary mechanism of chromosomal block shuffling that has shaped the genomes of the spermatophytes.Read less <
Keywords
Pinaceae synteny
English Keywords
chromosomal rearrangement
comparative mapping
Cuppressaceae gymnosperm
Origin
Hal imported