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Journal of Heredity Advance Access originally published online on January 21, 2008
Journal of Heredity 2008 99(2):177-181; doi:10.1093/jhered/esm110
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communications

A Chromosome-Specific Estimate of Transmission of Heterozygosity by 2n Gametes in Potato

Stanley J. Peloquin, Leonardo S. Boiteux, Philipp W. Simon, and Shelley H. Jansky

From the Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706-1590 (Peloquin); Centro Nacional de Pesquisa de Hortaliças/Empresa Brasilera de Pesquisa Agropecuária, CP 0218, Brasília 70399-970 DF Brazil (Boiteux); and the USDA/ARS (United States Department of Agriculture/Agricultural Research Service), Vegetable Crops Research Unit, Department of Horticulture, University of Wisconsin-Madison, 1575 Linden Drive, Madison, WI 53706-1590 (Simon and Jansky)

Address correspondence to S. H. Jansky at the address above, or e-mail: shjansky{at}wisc.edu.

Polyploid plants are formed when numerically unreduced (2n) gametes participate in fertilization. Based on cytological and genetic analyses, modes of 2n gamete formation have been determined for a number of plant species. Gametes formed by a first-division restitution (FDR) mechanism contain nonsister chromatids near the centromere, whereas those formed by second-division restitution (SDR) contain sister chromatids. These mechanisms differ in the proportion of heterozygous loci they transmit intact to offspring. This paper estimates the transmission of heterozygosity on an individual chromosome basis through pachytene analysis of chromosomes of haploids (2n = 2x = 24) of Solanum tuberosum Andigena Group (2n = 4x = 48), a South American cultivated potato. Transmission of heterozygosity by FDR and SDR 2n gametes was calculated for 6 different cytogenetic assumptions. FDR was more than twice as effective as SDR in transmission of heterozygosity under all 6 scenarios. Rates of transmission of heterozygosity were similar in each situation. Transmission of heterozygosity by FDR was also compared with transmission of heterozygosity by tetrasomic inheritance and found to be approximately 50% more effective.

Corresponding Editor: John Stommel

Received March 16, 2007
Accepted October 10, 2007


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