Karyotype analysis of Lactuca indica chromosome

OBJECTIVE To study systematically the evolution and fine seeds selection through Lactuca indica chromosome number, karyotype and volume METHODS Sections combined with micrograph were used to analyze chromosome karyotype etc RESULTS Normal diploid 2 n =18;karyotype formula was based on Levan's publication in 1964, K(2 n )=18=4 m+14 sm According to the method of Kou SR, the species chromosome based on the relative length was 2 n =18=8 M 2 +8 M 1 +2 S, which belonged to “3A” type according to the Stebbings karyotype classification The total length of chromosome groups was 60 03 μm, the long arms total length of chromosome groups was 40 33 μm, according to Arano’s method, the AS K% was 67 18% The total volume of chromosome was 113 05 μm 3 according to De vescovi et al CONCLUSION The chromosome number and morphological character of Lactuca indica were found clear