J Syst Evol ›› 2002, Vol. 40 ›› Issue (2): 125-132.

• Research Articles •

### The utility of trnK intron 5′ region in phylogenetic analysis of Ulmaceae s. l.

SONG Bao-Hua, LI Fa-Zeng

• Published:2002-03-18

Abstract: The sequences of chloroplast trn K intron 5' region were determined for seven genera of Ulmaceae s.l. ( 12 species), two genera of Cannabaceae, two of Moraceae and one genus from each of the three families, i.e. , Urticaceae, Eucommiaceae and Malvaceae. The aligned sequences used in PAUP analyses were 805 bp, and the maximum parsimony analysis resulted in a single most parsimonious tree with tree length = 665, CI = 0.7714 and RI = 0.7965. The topology of the tree is relatively strongly supported by the bootstrap test and congruent with those generated from rbc L sequence analysis and cpDNA restriction site analysis. The phylogenetic tree indicated that Ulmaceae s. l. is polyphyletic, and that the monophyletic Ulmaceae s. str. is sister to the other Urticales taxa. Cannabaceae, represented by Humulus and Cannabis, is nested within Celtidaceae, revealing that Celtidaceae is a paraphyletic group. Gironniera and Aphananthe are both clades of Celtidaceae. The study also suggested that the trn K intron should be suitable for phylogenetic analyses at intergenericor interspecific levels.