Plant Diversity ›› 2002, Vol. 24 ›› Issue (04): 1-3.

• Articles •    

Studies on the Classiication of Begonia Sect.Sphenanthera Based on Nuclear Ribosomal DNA ITS Sequence Data

XIANG Jian-Ying,GUAN Kai-Yun,YANG Jun-Bo   

  1. Kunming Institute of Botany,Chinese Academy of Sciences
  • Online:2002-08-25 Published:2002-08-25

Abstract: The sequences of nrDNA internal transcribed spacers(ITS)(including 5.8S rDNA)of 9 species and 2 varieties in Sect.Sphenanthera,4 species in Sect.Begonia were examined and analyzed B.cirrosa (sect.Coelocentrum),B.henryi(Sect.Reichenheimia)as outgrorp.The length of these sequences is 648-743bp,and the aligned length of ITS region is 756 position,which provides 26.41% variable sites and 10.11%phylogenetical informative sites when gaps are treated as missing.Six most parsimonious trees,with length of 286,consistency index(CI)of 0.8287 and retention in dex(RI)of 0.7841 were obtained by PAUP 4.0b8 analysis.

Key words: Begonia L.:Sect.Sphenanthera:ITS region