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Abstract Detail

Systematics Section

Pendinen, Galina [1], Gavrilenko, Tatjana [1], Jiang, Jiming [2], Spooner, David M. [3].

Genomic In Situ Hybridization (GISH) Analysis of the Mexican Hexaploid Wild Potato Species.

There are about 120 wild and cultivated species in Solanum L. 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. Determination of the type of polyploidy and the development of the genome concept for species of the section Petota has been based on the analysis of chromosome pairing in species and their hybrids, molecular markers, DNA sequences, and most recently for Mexican tetraploid species by GISH (Genome 51: 714-720. 2009). In the taxonomic treatment of Hawkes (1990) all hexaploid Mexican species are belong to series Demissa. According to a five genome hypotheses of Matsubayashi (1991), all hexaploid Mexican species are allopolyploids with genome formulae AADDD’D’, and the diploid Mexican species S. verrucosum was suggested by most authors as the putative contributor of the A genome. We analyzed the Mexican hexaploid species (S. demissum, S. hougasii, S. iopetalum, S. schenckii) with GISH, hybridized with DNA from the diploid species S. verrucosum, S. stenotomum, S. jamesii and S. ehrenbergii. Analysis of both mitotic and meiotic chromosomes of the Mexican hexaploids support S. hougasii, S. iopetalum, and S. schenckii as allopolyploids, with one genome related to the A of S. verrucosum and another genome related to the B genome of S. jamesii and S. ehrenbergii; the nature of the 3rd component genome is still unknown. However, S. demissum is supported as an autopolyploid A genome species Our results provide support a recent division of the Mexican hexaploid species on two groups the Iopetala Group containing S. hougasii, S. schenckii, and S. iopetalum, and the Acaulia Group containing S. demissum.

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1 - N. I. Vavilov Institute of Plant Industry, Bolshaya Morskaya Street, 44-22, St Petersburg, 190000, Russia
2 - University of Wisconsin-Madison, Horticulture
3 - USDA, Agricultural Research Service, Horticuluure, 1575 Linden Drive, Madison, Wisconsin, 53706-1590, USA


Presentation Type: Oral Paper:Papers for BSA Sections
Session: 66
Location: Maybird/Cliff Lodge - Level C
Date: Wednesday, July 29th, 2009
Time: 1:45 PM
Number: 66004
Abstract ID:922