[Karyotype and pollen morphology of main Fritillaria thunbergii cultivars].

Objective: To study the differences in pollen morphology and karyotype among main Fritillari thunbergii cultivars.

Method: Pollen morphologies of three F. thunbergii cultivars were examined by scanning electron microscopy (SEM), and the chromosome numbers and karyotypes were studied by applying traditional squash technique.

Result: The pollen shape of F. thunbergii (Xiaye) was ovoid, while those of the other F. thunbergii (Kuanye, Duozi) were oblong. There were significant differences in mesh ridge width, mesh size among three F. thunbergii cultivars. The karyotype formula ofthree cultivars were as follows: F. thunbergii (Xiaye) was 2n =2x =3m +1sm + 8st(2SAT) + 12t(4SAT), F. thunbergii (Kuanye) was 2n = 2x =2m + 2sm + 10st(2SAT) + 10t (2SAT), F. thunbergii (Duozi) was 2n =2x = 24 =2m +2sm +5st(2SAT) +15t(4SAT). The three cultivars of karyotype belonged to 3B; There were the heterozygosity of homologous chromosome in both F. thunbergii (Xiaye) and F. thunbergii (Duozi).

Conclusion: The genetic diversity of F. thunbergii is very rich, which could enhance the adaptability, and lay the foundations for new variety selection of F. thunbergii.