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Abstract Detail


Economic Botany: Evolution of Cultivated Plants

Govindarajulu, Rajanikanth [1], Hughes, Colin E. [2], Robertson, Ashley [3], Filer, Denis L [4], Bailey, C. Donovan [5].

Divergent diploid species relationships in Leucaena inferred from multiple independent gene regions: a progress report.

Leucaena comprises five polyploid and 17 diploid species of New World mimosoid legumes that include a number of important semi-domesticated taxa in south central Mexico as well as a pantropically cultivated forage species that is widely naturalized and invasive. Recent studies have shown that hybridization, facilitated by human translocation, is likely to have played a critical role in the incipient domestication of Leucaena. As part of a long-term project to uncover evolutionary relationships among all natural and semi-domesticated taxa in Leucaena, we are developing a robust well-resolved and densely sampled phylogeny for the divergent diploids, using maternally inherited cpDNA markers and biparentally inherited nuclear markers, to provide the backbone needed to unravel reticulate histories. Using extensive sampling of natural populations of diploid taxa and data derived from nine loci (three chloroplast [two trnK introns flanking the matK gene and psbA-trnH] and six nuclear encoded loci [nrDNA ITS and five anonymous SCAR-based loci - 23L, A9, 28, PA1213, A4A5]), we present a series of separate and combined analyses of gene sequences and data partitions. Using these preliminary results we focus on congruence between loci and the impact of alternative strategies for combining data from biparentally inherited makers.


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1 - New Mexico State University, Biology, Msc 3af, Las cruces, New Mexico, 88001, USA
2 - University of Oxford, Department of Plant Sciences, South Parks Road, Oxford, Oxfordshire, OX1 3RB, United Kingdom
3 - University of Bristol, School of Biological Sciences, Woodland Road, Bristol BS8 1UG, Bristol, United Kingdom
4 - University of Oxford, Department of Plant Sciences, South Parks Road, OX1 3RB, Oxford, United Kingdom
5 - New Mexico State University, Department of Biology, Po Box 30001, Department 3Af, Las Cruces, New Mexico, 88003-8001, USA

Keywords:
hybridization
Leucaena
semi-domesticated
phylogeny
polyploidy.

Presentation Type: Oral Paper:Papers for Topics
Session: 63
Location: 157/Law
Date: Wednesday, July 30th, 2008
Time: 2:00 PM
Number: 63003
Abstract ID:668


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