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《Acta Botanica Yunnanica》 1986-04
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A STUDY ON THE KARYOTYPES AND EVOLUTION OF DYSOSMA PLEIANTHA WITH ITS RELATIVES

Li Linchu (Department of Biology, Futan University)  
The present paper deals with the cytological investigation of Dys-osma pteiantha (Hance) Woodson, which is a Chinese medicine and endemic to China. The karyotype of the species is reported here for the first time. According to the terminology defined by Levan et al.[8] the karyotype formula is K(2n)=8m(2SAT)+2st(SAT)+2t. It belongs to "2A" of Stebbins'[12] karyo-typic symmetry and is generally regarded as a more primitive one. Measurements of the chromosome complement and the idiogram of the karyotype arc given in Table 1 and Fig. 2 respectively. Basing on the karyotype comparison of ( 1 ) Dysosma with (2) Sinopod-ophyllum and ( 3 ) Podophyllum (Table l and 2 ) , the present author suggested that the evolutionary order of them from primary to advance would be (1) , (2), (3) and there be two evolutionary lines (Fig. 3 ) likely.
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