Open AccessA High‐Density, Sequence‐Enriched Genetic Map of Hordeum bulbosum and Its Collinearity to H. vulgare
Author(s) -
Wendler Neele,
Mascher Martin,
Himmelbach Axel,
Bini Federica,
Kumlehn Jochen,
Stein Nils
Publication year - 2017
Publication title -
the plant genome
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.403
H-Index - 41
ISSN - 1940-3372
DOI - 10.3835/plantgenome2017.06.0049
Subject(s) - biology , hordeum vulgare , genetics , introgression , hordeum , gene , botany , poaceae
Hordeum bulbosum L., a wild grass and close relative of cultivated barley ( Hordeum vulgare L.), gained importance in plant breeding as inducer of haploid plants in crosses with barley and also as a genetic resource for introgression of disease resistance/tolerance genes into cultivated barley. Genetic mapping of genes introgressed from H. bulbosum is a prerequisite for their efficient utilization in barley breeding, but often hindered due to repressed recombination. The mechanism underlying the reduced frequency or lack of meiotic recombination between H . bulbosum and H . vulgare chromatin in introgressed segments is not understood. It may be explained by lack of genome collinearity or other structural differences between both genomes. In the present study, two F 1 mapping populations of H. bulbosum were analyzed by genotyping‐by‐sequencing (GBS) and four dense H. bulbosum genetic maps containing 1449, 996, 720, and 943 SNP markers, respectively, revealed overall a high degree of collinearity for all seven homeologous linkage groups of H. vulgare and H. bulbosum . The patterns of distribution of recombination along chromosomes differed between barley and H. bulbosum , indicating organizational differences between both genomes.