Karyotypic Characteristics and Genetic Relationships of Apricot Accessions from Different Ecological Groups

The present study aims to reveal the karyotypic characteristics and genetic relationships of apricot (Prunus armeniaca L.) accessions from different ecological groups. Fourteen, 9, and 30 accessions from the Central Asian ecological group, North China ecological group, and Dzhungar-Ili ecological group, respectively, were analyzed according to the conventional pressing plate method. The results showed that all the apricot accessions from the different ecological groups were diploid (2n = 2x = 16). The total haploid length of the chromosome set of the selected accessions ranged from 8.11 to 12.75 mm, which was a small chromosome, and no satellite chromosomes were detected. All accessions had different numbers of median-centromere chromosomes or sub-median-centromere chromosomes. The karyotypes of the selected accessions were classified as 1A or 2A. Principal component analysis revealed that the long-arm/short-arm ratio (0.968) and the karyotype symmetry index (-0.979) were the most valuable parameters, and cluster analysis revealed that the accessions from the Central Asian ecological group and Dzhungar-Ili ecological group clustered together. In terms of karyotypic characteristics, the accessions from the Dzhungar-Ili ecological group and Central Asian ecological group were closely related.

Automated summary

The present study analyzed the karyotypic characteristics and genetic relationships of apricot accessions from different ecological groups, finding that all accessions were diploid with specific chromosome characteristics. The most valuable parameters for karyotype analysis were the long-arm/short-arm ratio and the karyotype symmetry index. Additionally, cluster analysis revealed a close relationship between the accessions from the Central Asian ecological group and Dzhungar-Ili ecological group in terms of karyotypic characteristics.