GrainGenes Reference Report: GNM-42-720
Reference
GNM-42-720
Title
The pattern of homoeologous recombination in triploid hybrid of Lolium multiflorum with Festuca pratensis
Journal
Genome
Year
2000
Volume
42
Pages
720-726
Author
Zwierzykowski Z Lukaszewski AJ Naganowska B Lesniewska A
Abstract
Summary: Homoeologous chromosomes of Lolium-Festuca hybrids are capable of frequent meiotic pairing and recombination. The frequency and distribution of recombination was studied by genomic in situ hybridization in backcross progenies of reciprocal triploid hybrids of Lolium multiflorum with Festuca pratensis. Significant differences in the male transmission of the parental and translocated chromosomes were observed depending on the cytoplasm of the F(1) hybrids and the ploidy level of the female test cross partner. The frequency of intergeneric translocations in the progeny indicated that, on average, there must have been at least 4.5 homoeologous arms paired in the F(1) hybrids; the actual frequency might have been higher because of pre- or post-zygotic selection against the F. pratensis chromatin, which probably eliminated certain gametes with Festuca-Lolium translocations. Both parental species are known for localized distal chiasmata, but the intergeneric translocation breakpoints were distributed along the entire lengths of the chromosome arms. The change in the distribution of homoeologous recombination might have been related to different pairing initiation of homologues and homoeologues. It probably resulted from allocation of additional chiasmata to chromosome arms and produced a net increase in recombination. Total number of records in report: 114
Keyword
backcross
[ Show all 21 ]
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: GNM-42-720
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
|
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||