Plant Diversity ›› 2005, Vol. 27 ›› Issue (05): 539-544.

• Articles •

### Study on Karyotypes of Six Species in Angelica from Sichuan, China

ZHANG Qiao-Ying1 , HE Xing-Jin2 , ZHANG Yun-Chun1 , LUO Peng1 , WU Ning1

1. 1 Chengdu Institute of Biology , Chinese Academy of Sciences, Chengdu 610041 , China; 2 College of Life Science, Sichuan University , Chengdu 610064 , China
• Received:2004-12-07 Online:2005-10-01 Published:2005-10-01
• Contact: ZHANG Qiao-Ying

Abstract: Karyotypes of 6 species in Angelica L . from Sichuan are studied at population level and the karyotype of A. pseudoselinum is firstly reported . It is found that the number of chromosomes are invariably 2n = 2x =22 , with most of them are median and submedian centromeric chromosomes, while subterminal centromeric chromosomes exist in A. omeiensis . The majority of karyotypes belong to 2A, and Shihuiyao population of A. laxifoliata has 1A types . As for karyotypic formula , A. omeiensis is 2n =22 = 10m+ 2sm+ 10st , A. maowenensis is 2n =22= 16m+ 4sm+ 2sm (SAT) , A. sinensis is 2n = 22 = 14m+ 8sm, A. apaensis is 2n = 22 = 14m+8sm, and A. pseudoselinum is 2n =22 = 12m+ 8sm+2sm (SAT ) . However, different populations of A. laxiforliata don’t have the same karyotypic formulae, and there are some variations between the caryotypes more or less . According to Stebbins, A. omeiensis’s evolution status was showed by the highest index of asymmetry among six species studied in this paper , while A. laxiforliata is a little primitive because of its lower index of asymmetry and its 1A caryotypes . However , the morphological, anatomic , karyotypic characters and that of pollen grains are evolving asynchronously , suggesting that, Sichuan as one of the frequency centers of Angelica L . in China , is also one of the differentiation centers of Angelica L .

Key words: Angelica