Journal
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
Volume 150, Issue 1, Pages 101-113Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1095-8339.2006.00488.x
Keywords
character evolution; chromosome number; dysploidy; flower symmetry; haustorium; merosity; mistletoe; parasitic angiosperms; seedlings
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The Loranthaceae is the largest plant family with aerial branch parasites termed mistletoes. Three genera of Loranthaceae are terrestrial root parasites and the remaining 72 genera are aerial parasites. Several characters, including habit, haustorial type, germination pattern, pollen morphology, chromosome number, inflorescence morphology and flower merosity, fusion, symmetry and size, are considered to reflect evolutionary relationships within the family. Convergence is a common evolutionary pattern and can confound interpretations of evolution. We investigated character evolution by mapping character states onto a phylogenetic tree based on the nuclear ITS and chloroplast trnL trnF regions. Convergences in form were found in several characters, including habit, haustorial type, flower symmetry and merosity. These convergences typically correspond to ecological parameters such as pollination syndrome or stresses associated with the canopy habit. Other characters such as chromosome number and germination pattern illustrate divergent evolution among clades. (c) 2006 The Linnean Society of London, Botanical Journal of the Linnean Society, 2006, 150, 101-113.
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