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      QTL mapping reveals genetic determinants of fungal disease resistance in the wild lentil species Lens ervoides

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          Abstract

          Lens ervoides, a wild relative of lentil is an important source of allelic diversity for enhancing the genetic resistance of the cultivated species against economically important fungal diseases, such as anthracnose and Stemphylium blight caused by Colletotrichum lentis and Stemphylium botryosum, respectively. To unravel the genetic control underlying resistance to these fungal diseases, a recombinant inbred line (RIL) population (n = 94, F 9) originating from a cross between two L. ervoides accessions, L01-827A and IG 72815, was genotyped on the Illumina HiSeq 2500 platform. A total of 289.07 million 100 bp paired-end reads were generated, giving an average 7.53-fold genomic coverage to the RILs and identifying 2,180 high-quality SNPs that assembled in 543 unique haplotypes. Seven linkage groups were resolved among haplotypes, equal to the haploid chromosome number in L. ervoides. The genetic map spanned a cumulative distance of 740.94 cM. Composite interval mapping revealed five QTLs with a significant association with resistance to C. lentis race 0, six QTLs for C. lentis race 1 resistance, and three QTLs for S. botryosum resistance. Taken together, the data obtained in the study reveal that the expression of resistance to fungal diseases in L. ervoides is a result of rearrangement of resistant alleles contributed by both parental accessions.

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          A LysM receptor-like kinase plays a critical role in chitin signaling and fungal resistance in Arabidopsis.

          Jinrong Wan, Xue-Cheng Zhang, David Neece … (2008)
          Chitin, a polymer of N-acetyl-d-glucosamine, is found in fungal cell walls but not in plants. Plant cells can perceive chitin fragments (chitooligosaccharides) leading to gene induction and defense responses. We identified a LysM receptor-like protein (LysM RLK1) required for chitin signaling in Arabidopsis thaliana. The mutation in this gene blocked the induction of almost all chitooligosaccharide-responsive genes and led to more susceptibility to fungal pathogens but had no effect on infection by a bacterial pathogen. Additionally, exogenously applied chitooligosaccharides enhanced resistance against both fungal and bacterial pathogens in the wild-type plants but not in the mutant. Together, our data indicate that LysM RLK1 is essential for chitin signaling in plants (likely as part of the receptor complex) and is involved in chitin-mediated plant innate immunity. The LysM RLK1-mediated chitin signaling pathway is unique, but it may share a conserved downstream pathway with the FLS2/flagellin- and EFR/EF-Tu-mediated signaling pathways. Additionally, our work suggests a possible evolutionary relationship between the chitin and Nod factor perception mechanisms due to the similarities between their potential receptors and between the signal molecules perceived by them.
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            RECORD: a novel method for ordering loci on a genetic linkage map.

            P. Stam, Richard Visser, D Berg … (2005)
            A new method, REcombination Counting and ORDering (RECORD) is presented for the ordering of loci on genetic linkage maps. The method minimizes the total number of recombination events. The search algorithm is a heuristic procedure, combining elements of branch-and-bound with local reshuffling. Since the criterion we propose does not require intensive calculations, the algorithm rapidly produces an optimal ordering as well as a series of near-optimal ones. The latter provides insight into the local certainty of ordering along the map. A simulation study was performed to compare the performance of RECORD and JoinMap. RECORD is much faster and less sensitive to missing observations and scoring errors, since the optimisation criterion is less dependent on the position of the erroneous markers. In particular, RECORD performs better in regions of the map with high marker density. The implications of high marker densities on linkage map construction are discussed.
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              Pulse domestication before cultivation

              G Ladizinsky (1987)
              Article 0 comments Cited 48 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Sabine Banniza: sabine.banniza@usask.ca
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 12 June 2017
                Publication date PMC-release: 12 June 2017
                Publication date Collection: 2017
                Volume: 7
                Electronic Location Identifier: 3231
                Affiliations
                [1 ]ISNI 0000 0001 2154 235X, GRID grid.25152.31, Crop Development Centre/Department of Plant Sciences, , University of Saskatchewan, ; Saskatoon, Canada
                [2 ]Swift Current Research and Development Center, Agriculture and Agri-Food Canada, Swift Current, Canada
                Article
                Publisher ID: 3463
                DOI: 10.1038/s41598-017-03463-9
                PMC ID: 5468239
                PubMed ID: 28607439
                SO-VID: f3e4da75-115e-4eec-aaec-ee37a14640eb
                Copyright © © The Author(s) 2017
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 27 February 2017
                Date accepted : 3 May 2017
                Categories
                Subject: Article
                Custom metadata
                issue-copyright-statement © The Author(s) 2017

                ScienceOpen disciplines: Uncategorized
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