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- Title
Genomic in situ hybridization reveals both auto- and allopolyploid origins of different North and Central American hexaploid potato ( Solanum sect. Petota) species.
- Authors
Pendinen, Galina; Spooner, David M.; Jiang, Jiming; Gavrilenko, Tatjana; Puertas, M.
- Abstract
Wild potato ( Solanum L. sect. Petota Dumort.) species contain diploids (2 n = 2 x = 24) to hexaploids (2 n = 6 x = 72). J.G. Hawkes classified all hexaploid Mexican species in series Demissa Bukasov and, according to a classic five-genome hypothesis of M. Matsubayashi in 1991, all members of series Demissa are allopolyploids. We investigated the genome composition of members of Hawkes's series Demissa with genomic in situ hybridization (GISH), using labeled DNA of their putative progenitors having diploid AA, BB, or PP genome species or with DNA of tetraploid species having AABB or AAAaAa genomes. GISH analyses support S. hougasii Correll as an allopolyploid with one AA component genome and another BB component genome. Our results also indicate that the third genome of S. hougasii is more closely related to P or a P genome-related species. Solanum demissum Lindl., in contrast, has all three chromosome sets related to the basic A genome, similar to the GISH results of polyploid species of series Acaulia Juz. Our results support a more recent taxonomic division of the Mexican hexaploid species into two groups: the allopolyploid Iopetala group containing S. hougasii, and an autopolyploid Acaulia group containing S. demissum with South American species S. acaule Bitter and S. albicans (Ochoa) Ochoa.
- Subjects
CENTRAL America; NORTH America; IN situ hybridization; PLANT chromosome numbers; ALLOPOLYPLOIDY in plant chromosomes; POTATO genetics; PLANT species; PLANT genomes
- Publication
Genome, 2012, Vol 55, Issue 6, p407
- ISSN
0831-2796
- Publication type
Article
- DOI
10.1139/g2012-027