Radiation hybrid map of barley chromosome 3H

Mona Mazaheri, Penny M Kianian, Ajay Kumar, Mohamed Mergoum, Raed Seetan, Ali Soltani, Lucy I. Lund, Seyed M. Pirseyedi, Anne M. Denton, Shahryar Kianian

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Assembly of the barley (Hordeum vulgare L.) genome is complicated by its large size (5.1 Gb) and proportion of repetitive elements (84%). This process is facilitated by high resolution maps for aligning bacterial artificial chromosome (BAC) contigs along chromosomes. Available genetic maps, however, do not provide accurate information on the physical position of a large portion of the genome located in recombination-poor regions. Radiation hybrid (RH) mapping is an alternative approach, which is based on radiation-induced deletions along the length of chromosomes. In this study, the first RH map for barley chromosome 3H was developed. In total, 373 in vivo RH lines were generated by irradiating wheat (Triticum aestivum L.)–barley chromosome 3H addition lines and crossing them to a normal wheat cultivar. Each RH informative line (containing deletions) had, on average, three deletions. The induced deletion size varied from 36.58 Kb to 576.00 Mb, with an average length of 52.42 Mb. This initial chromosome 3H radiation hybrid (3H-RH) map had a 9.53´ higher resolution than an analogous genetic map, reaching a maximum of >262.40´ resolution in regions around the centromere. The final RH map was 3066.1 cR in length, with a 0.76 Mb resolution. It was estimated that the map resolution can be improved to an average of 30.34 Kb by saturating the 3H-RH map with molecular markers. The generated RH panel enabled alignment of BAC and sequenced contigs as small as 1.50 Kb in size. The high resolution and the coverage of poor-recombination regions make RH maps an ideal resource for barley genome assembly, as well as other genetic studies

Original languageEnglish (US)
JournalPlant Genome
Volume8
Issue number2
DOIs
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© Crop Science Society of America

Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.

Fingerprint Dive into the research topics of 'Radiation hybrid map of barley chromosome 3H'. Together they form a unique fingerprint.

Cite this