Introgression reshapes recombination distribution in grapevine interspecific hybrids.

Introgression reshapes recombination distribution in grapevine interspecific hybrids.
Theor Appl Genet. 2018 Dec 08;:
Authors: Delame M, Prado E, Blanc S, Robert-Siegwald G, Schneider C, Mestre P, Rustenholz C, Merdinoglu D
Abstract
KEY MESSAGE: In grapevine interspecific hybrids, meiotic recombination is suppressed in homeologous regions and enhanced in homologous regions of recombined chromosomes, whereas crossover rate remains unchanged when chromosome pairs are entirely homeologous. Vitis rotundifolia, an American species related to the cultivated European grapevine Vitis vinifera, has a high level of resistance to several grapevine major diseases and is consequently a valuable resource for grape breeding. However, crosses between both species most often lead to very few poorly fertile hybrids. In this context, identifying genetic and genomic features that make cross-breeding between both species difficult is essential. To this end, three mapping populations were generated by pseudo-backcrosses using V. rotundifolia as the donor parent and several V. vinifera cultivars as the recurrent parents. Genotyping-by-sequencing was used to establish high-density genetic linkage maps and to determine the genetic composition of the chromosomes of each individual. A good collinearity of the SNP positions was observed between parental maps, confirming the synteny between both species, except on lower arm of chromosome 7. Interestingly, recomb...

Source: TAG. Theoretical and Applied Genetics - December 8, 2018 Category: Genetics & Stem Cells Authors: Delame M, Prado E, Blanc S, Robert-Siegwald G, Schneider C, Mestre P, Rustenholz C, Merdinoglu D Tags: Theor Appl Genet Source Type: research