AoB PLANTS Genome downsizing and karyotype constancy in diploid and polyploid congeners: a model of genome size-variation In several genera evolutionary chromosome change involves variation in DNA amount in diploids and genome downsizing in polyploids. In a new study in AoB PLANTS, Poggio et al. analysed the genome size and karyotypical... AoBPLANTSSeptember 11, 2014