[Karyotype analysis of Picris davurica chromosome]

To systematically study Picris davurica Fisch chromosome karyotype.

Sections combined with micrograph were used to analyse chromosome.

Chromosome number of normal diploid was 2n = 10, karyotype formula was K (2n) = 10 = 2 m + 8 sm, the relative length was 2n = 10 = 2 L + 2 M2 + 4 M1 + 2 S, which belonged to "3 A" type. The total length of chromosome groups was 12.51 microns, the total length of long arms was 8.36 microns, the AS. K% was 66.83%. The total volume of chromosome was 11.71 microns3.

Picris davurica chromosome number and morphological character were clear.