Journal article

Comparative morphology and phylogeny of Nicotiana section Suaveolentes (Solanaceae) in Australia and the South Pacific

Claire E Marks, Ed Newbigin, Pauline Y Ladiges



Molecular phylogenies alone have failed to resolve evolutionary relationships of Nicotiana L. section Suaveolentes Goodsp. (Solanaceae), a section largely comprising Australian endemics. Comparative morphology of Suaveolentes is illustrated and characters, together with the chromosome number, coded for phylogenetic analysis. Morphological characters included discrete characters of seeds and trichomes studied by scanning electron and light microscopy, and gap-coded quantitative measurements of flowers and vegetative organs. These data were analysed using both maximum parsimony and splits network, and compared to and combined with molecular analyses based on published nuclear and chloroplast-D..

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Funding Acknowledgements

C. E. M. acknowledges the receipt of an Australian Postgraduate Award, an Hansjorg Eichler Scientific Research Award from the Australian Systematic Botany Society Inc. to support field work, a student travel bursary from the Australian Biological Resources Study, and a School of Botany Foundation Travel Award together with a Melbourne Abroad Travel Scholarship to attend the PAA Solanaceae 2006 Conference (Madison, Wisconsin, USA). The following herbaria are acknowledged for providing access to collections: AD, BM, CANB, K, MEL, NT and NY. Seed was made available from the Australian Tropical Crops and Forages Collection, Biloela, Queensland, David Symon (AD), John Hamill (Monash University) and the Experimental Garden and Genebank of the Radboud University (Nijmegen, The Netherlands). David Albrecht (NT) and rangers at Watarrka National Park (Northern Territory, Australia) assisted with locating some field populations of Nicotiana. David Symon and Sandra Knapp also provided advice.