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Geostatistical analyses have been used to describe/model patterns of gene frequencies at eight allozyme loci in 93 sessile oak populations distributed over the natural range. Geostatistics appears to be useful for description of such complex patterns in genetic variation and this for management of natural genetic resources in forest trees.

Hundred and Fourteen genotypes belonging to tetraploid and diploid cherry species were analyzed using 75 AFLP markers. There were specific alleles in P.cerasus, which were not present in the A genome of P. avium and which probably came from the F genome of P.cerasus.

PRUNUS AVIUM: L. (diploid, AA, 2n=2x=16), Prunus cerasus L. (allotetraploïd, AAFF, 2n=4x=32) species, and their hybrid Prunus×gondouinii Rehd., constitute the most widely cultivated cherry tree species. P. cerasus is supposed to be an hybrid species produced by the union of unreduced P. avium gametes and normal P. fruticosa gametes. A continuum of morphological traits between these three species makes their assignation difficult. The aim of this paper is to study the genetic relationships between tetraploid and diploid cherry species. In all, 114 genotypes belonging to these species were analyzed using 75 AFLP markers. The coordinates of these genotypes on the first axis of a correspondence analysis allowed us to clearly distinguish each species, to identify misclassifications and to assign unknown genotypes to one species. We showed that there are specific alleles in P. cerasus, which are not present in the A genome of P. avium and which probably come from the F genome of P. cerasus. The frequencies of each marker in the A and the F genomes were estimated in order to identify A and F specific markers. We discuss the utility of these specific markers for finding the origin of the A and F genomes in the allopolyploid species.Heredity (2004) 93, 631-638. doi:10.1038/sj.hdy.6800589 Published online 8 September 2004 [ABSTRACT FROM AUTHOR]