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Title of Journal: Theor Appl Genet

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Abbravation: Theoretical and Applied Genetics

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Springer-Verlag

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DOI

10.1007/s00404-007-0391-8

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1432-2242

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Substitutes for genome differentiation in tuberbe

Authors: E L Camadro D Carputo S J Peloquin
Publish Date: 2004/07/20
Volume: 109, Issue: 7, Pages: 1369-1376
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Abstract

The cultivated potato Solanum tuberosum L 2n=4x=48 has a very large number of related wild and cultivated tuberbearing species widely distributed in the Americas These species grouped in 16 taxonomic series range from the diploid to the hexaploid level Polyploid species are either disomic or polysomic and sexual polyploidization via genetically controlled 2n gametes has played a major role in their evolution Species are separated in nature by geographical and ecological barriers However there are several examples of sympatric species that share the same niches but do not readily cross ie the diploids S commersonii and S chacoense in certain areas of Argentina External barriers alone are therefore not sufficient to explain species integrity In addition there is no strong evidence indicating that genome differentiation is important in the group In this review we present evidence supporting the assertion that interspecific pollenpistil incompatibility nuclearcytoplasmic male sterility and the endosperm are major forces that strengthen the external hybridization barriers allowing at the same time and under specific circumstances a certain amount of gene exchange without jeopardizing the integrity of the species

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