A Study on Karyotypes of Eight Species and Geographical Distribution of Angelica (Umbelliferae) in Sichuan

Abstract

Abstract:

Nearly 32 species of Angelica occur in China, taking up one third of total species

number of the genus in the world, with 12 species in Sichuan. In the present paper karyotypes

of 8 species from Sichuan are first reported with x = 11. The parameters of chromosomes of 8

species are given in Table 1 and the karyotypes are shown in Plate 1, 2. The karyotype formu-

lae are as follows: A. valida Diels K(2n) =22=20m+2sm (Wulong Xian, alt. 1900m); A.

dielsii Boiss. K(2n) =22= 18m+2sm^sat+2sm (Songpan Xian, alt. 3000m); A. laxifoliata Diels

has 2 kinds of karyotypes in 3 populations: K(2n) =22= 18m+4sm (Hanyuan Xian, alt.

1900m) and K(2n) =22= 16m+6sm (Songpan Xian, alt. 2500m and Baoji in Shaanxi, alt. =

1500m); A. setchuensis Diels K (2n) = 22 = 16m+2sm^sat+4sm (Songpan Xian, alt. 2800m); A.

maowenensis Yuan et Shan K(2n) =22= 16m+ 6sm (Songpan Xian, alt. 2800); A.

chinghaiensis Shan ex K.T.Fu K (2n) = 4x= 44 = 36m+8sm (Songpan Xian, alt. 3500m); A.

Sinensis (Oliv.)Diels K(2n) =22= 14M+8sm (Songpan Xian, alt. 2900m); A. omeiensis

Yuan et Shan K (2n) = 22 = 10m+2sm+ 10st (Mt. Omei, alt. 2100m). The karyotypes of A.

valida and 2 populations of A. laxifoliata belong to “1A” and those of one population of A.

laxifoliata and the rest 6 species “2A”.

By analysing the correlation between the karyotypic symmetry and vertical distribution

of A. laxifoliata and A. chinghaiensis, it is considered that as altitude rises, the karyotypic

asymmetry and ploidy increases.

Comparing with the karyotypes of other species distributed in Northeastern China

and Japan previously reported, the karyotype of A. valida with oblong-ovoid fruits and

1-2-pinnate leaves is most primitive and that of A. omeiensis with nearly rounded fruits

and 3-ternate-pinnate leaves is most advanced in Angelica. Based on the fact that many

species including the most primitive and the most advanced species are concentrated in

Sichuan, it may be suggested that the center of origin and diversity of Angelica be in

Sichuan characterized.

Key words: Angelica, Karyotype, Geographical distribution, Sichuan

Pan Ze-Hui, Liu Xin-Tian, Sheh Meng-Lan, Xu Lang-Ran. A Study on Karyotypes of Eight Species and Geographical Distribution of Angelica (Umbelliferae) in Sichuan[J]. .

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A Study on Karyotypes of Eight Species and Geographical Distribution of Angelica (Umbelliferae) in Sichuan

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