Can molecular systematics provide insights into aspects of the reproductive biology of Trachymene Rudge (Araliaceae)?
Henwood, Murray J.; Lu-Irving, Patricia; Perkins, Andrew J.
published: Aug 1, 2010
ArtNo. ESP145012871006, Price: 29.00 €
The phylogenetic relationships of 23 Australian species of Trachymene Rudge plus Uldinia ceratocarpa (W.Fitzg.) N.T.Burb. are estimated using separate and combined analyses of nucleotide sequences derived from the trnT-trnF region of the chloroplast genome and the External Transcribed Spacer (ETS) region of the nuclear genome. Maximum parsimony and Maximum Likelihood analyses produce congruent topologies that resolve a monophyletic Trachymene (inclusive of U. ceratocarpa) comprising four subclades matching the currently recognized infrageneric classification of the genus. A formal synopsis of section Trachymene is provided. The resultant phylogeny is used to provide insights into the evolution of various aspects of the reproductive biology of Trachymene including; palynological characters, life-history attributes and breeding system data. Andromonoecy and a perennial life-history are plesiomorphic in Trachymene. From these we propose the independent origin of a number of different breeding system and life-history attributes. We describe the co-variation of several reproductive character states with each other, and we explore their possible functional significance.