In all the Fragaria species and subspecies examined
here, the 5S rDNA signals were displayed in proximal
regions of chromosome short arms, while the 25S rDNA
signals were on terminal chromosomal regions, indicating
that the chromosomal positions of rDNA sites are
highly conserved across Fragaria. Yet, as detailed below,
marked variations in signal intensity were observed
among diploid taxa, and intriguing instances and patterns
of signal loss were observed, both within and
between ploidy levels.