Cai, Danying , Rodriguez, F. , Spooner, David M. .
New insights from a multilocus analysis into the evolutionary history of polyploidy in Solanum section Petota.
There are about 120 wild and cultivated species in Solanum section Petota Dumort. About 70% of these are diploid (2n = 2x = 24), with the rest tetraploid (2n = 4x = 48), hexaploid (2n = 6x = 72), and a few rare triploid and pentaploid populations. The polyploids range from clear allopolyploids to apparent autopolyploids. Recent phylogenetic analyses using the single-copy nuclear genes GBSSI (The Plant Genome, a suppl. to Crop Sci. 48(S1): S27–S36. 2008) and nitrate reductase, NIA (Syst. Bot. 34: 207-219. 2009) have shed new light on the origin of the polyploids. Our research is extending these studies using additional species, additional accessions, and a new nuclear orthologous marker type, conserved orthologous set sequences (COSII markers) to provide additional insights into polyploid origins, including possible multiple origins of the polyploids. Preliminary COSII data (4 COSII, 2664 characters concatenated length) are concordant in documenting allopolyploid origins of the Mexican members of series Longipedicellata (4x) and the Iopetala Group (6x) shown with GBSSI and NIA, but differ regarding possible allopolyploid origins of other polyploid groups. We are sequencing additional COSII and additional diploid species to address allopolyploid origins with better statistical support.
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1 - Zhejiang University, Department of Horticulture, Institution of Fruit Science, 268 Kaixuan Road, Hangzhou, Zhejiang, 310029, China
2 - University of Wisconsin Madison, Horticulture Department, 1575 Linden Dr., Madison, Wisconsin, 53706-1590, USA
3 - USDA, Agricultural Research Service, Horticulture, 1575 Linden Dr., Madison, Wisconsin, 53706-1590, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 4:45 PM