Physical Distribution of Homoeologous Recombination in Individual Chromosomes of Festuca pratensis in Lolium multiflorum

0349180 - ÚEB 2011 RIV CH eng J - Journal Article
Kopecký, David - Havránková, Miroslava - Loureiro, J. - Castro, S. - Lukaszewski, A.J. - Bartoš, Jan - Kopecká, J. - Doležel, Jaroslav
Physical Distribution of Homoeologous Recombination in Individual Chromosomes of Festuca pratensis in Lolium multiflorum.
Cytogenetic and Genome Research. Roč. 129, 1-3 (2010), s. 162-172. ISSN 1424-8581. E-ISSN 1424-859X
R&D Projects: GA MZe QH71267; GA ČR GP521/07/P479
Institutional research plan: CEZ:AV0Z50380511
Keywords : Chromosome introgression * Festuca * Flow cytometry
Subject RIV: GE - Plant Breeding
Impact factor: 1.783, year: 2010
http://arl-repository.lib.cas.cz/uloziste_av/UEB-Q/cav_un_epca-0349180_01.pdf

Crossing over-based recombination is a powerful tool for generating new allelic combinations during sexual reproduction. It usually occurs between homologous chromosomes. However, under some conditions, homoeologues may also be capable of crossing over. Whether homologous and homoeologous crossovers are equivalent and governed by the same rules has never been established. Here we report on chromosome distribution of homoeologous crossovers in a unique system of Festuca X Lolium hybrids. Unlike in most other hybrids, in these intergeneric hybrids, homoeologous chromosomes are capable of pairing and crossing over with frequencies approaching that of homologues. At the same time, genome divergence makes cytological detection of chromosome recombination feasible. We analyzed the distribution of homoeologous recombination along individual chromosomes in a complete set of intergeneric single chromosome substitutions from F. pratensis into tetraploid L. multiflorum.
Permanent Link: http://hdl.handle.net/11104/0189488