PJB-2002-30
SEQUENCE DIVERGENCE OF RBCL GENE AND HYLOGENETIC RELATIONSHIPS IN LILIALES
ZABTA KHAN SHINWARI
Abstract
DNA sequences of the chloroplast gene encoding the large submit of ribulose-1. 5-bisphosphate-carboxylase (rbcL) of 20 taxa representing four different orders of Liliflorae was compared, Two different methods (maximum parsimony using PAUP and neighbour joining (NJ) were employed for phylogenetic reconstruction. Similar tree topologies were obtained by both methods. Both trees indicate that Liliales sensu Dahlgren et at., (1985) is not a monophyletic group. Phylogenetic analysis revealed two clades within order Liliales. Clade "A" includes Tricyrtidaceae and Liliaceae sensu stricto and corresponds to Liliales sensu stricto. Clade "B" includes Colchicaceae and Uvulariaceae. Monophyly of the taxa within groups A and B is supported in 92 and 100% respectively, of the bootstrap replications for parsimony method and 97 and 100% for neighbour joining method. The Iridaceae form a clade with Asparagales that is supported in 100% of the bootstrap replications for both parsimony and NJ methods. Smilax, which Dahlgren et at., placed in Dioscoreales, is clustered with those of clade "A" of Liliales.
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