Karyotype analysis of six oat cultivars

To directly identify the number, size, and morphology of chromosomes in oat (Avena sativa), the chromosome karyotypes of six oat cultivars were analyzed by sectioning the root tips. The results showed that the chromosome number of six oat cultivars was 2n = 42, and all tested materials were hexaploids. Among them, the karyotype formula of ‘Yan Wang’, ‘Monica’, and ‘Qiang Shou’ was respectively 2n = 6X = 26m + 16sm (6sat), 2n = 6X = 22m + 20sm (4sat), and 2n = 6X = 22m (2sat) + 20sm (4sat), belonging to type 2B. The karyotype formula of ‘Qinghai 444’, ‘Mu Wang’, and ‘Jun Ma’ was respectively 2n = 6X = 28m (4sat) + 14sm, 2n = 6X = 22m (2sat) + 20sm (2sat), and 2n = 6X = 22m (2sat) + 20sm (4sat), and their karyotype type was 2A. All six oat cultivars contained satellites. The results of this study can provide a cytological basis for the identification of oat germplasm resources and research on genetic breeding.