A genome-wide survey of reproductive barriers in an intraspecific hybrid.

Genetics
Y HarushimaN Kurata

Abstract

Genetic study of the reproductive barriers between related species plays an essential role in understanding the process of speciation. We developed a new method for mapping all possible factors causing deviations from expected Mendelian segregation ratios in F(2) progeny, which substantially contribute to reproductive isolation. A multiresponse nonlinear regression analysis of the allele frequencies of the markers covering an entire genome in the F(2) population was performed to estimate the map position and intensity of the reproductive barriers on each chromosome. In F(2) plants from a cross between a Japonica variety of rice, Nipponbare, and an Indica variety, Kasalath, the deviations of allele frequencies were well explained by 33 reproductive barriers. Of these, 15 reproductive barriers affected the allele transmission rate through the gametophyte and in 9 of these 15 cases, an Indica allele was transmitted at a higher frequency than a Japonica allele. The other 18 reproductive barriers altered the viability of the zygote via its genotype. Two zygotic reproductive barriers showed overdominance and 5 showed underdominance. The most pronounced reproductive barrier, mapped at 62.3 +/- 0.4 cM on chromosome 3, transmitted the I...Continue Reading

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Citations

Jan 24, 2002·Genetics·Yoshiaki HarushimaNori Kurata
Jan 18, 2006·Genetics·Andrea L SweigartJohn H Willis
Mar 21, 2006·Zoological Science·Shungo KanoPaolo Sordino
Dec 13, 2007·PloS One·Hernán López-Fernández, Daniel I Bolnick
Mar 22, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Katsuyuki IchitaniTsutomu Kuboyama
Dec 28, 2002·Genome Génome / Conseil National De Recherches Canada·Ricardo A PertuzéRoger T Chetelat
Nov 27, 2008·Proceedings of the National Academy of Sciences of the United States of America·Yunming LongYao-Guang Liu
Apr 23, 2010·Genes & Genetic Systems·Soichi YamanoShuhei Nasuda
May 1, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Kenta ShirasawaSachiko Isobe
Sep 24, 2010·Journal of Genetics·Masumi YamagishiMasahiro Yano
Nov 5, 2010·Proceedings of the National Academy of Sciences of the United States of America·Yoko MizutaNori Kurata
Jun 8, 2011·Proceedings of the National Academy of Sciences of the United States of America·Kenji AsanoMakoto Matsuoka

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