Major Quantitative Trait Loci and Putative Candidate Genes for Powdery Mildew Resistance and Fruit-Related Traits Revealed by an Intraspecific Genetic Map for Watermelon (Citrullus lanatus var. lanatus)

Kwang-Hwan Kim, Ji-Hyun Hwang, Dong-Yeup Han, Minkyu Park, Seungill Kim, Doil Choi, Yongjae Kim, Gung Pyo Lee, Sun-Tae Kim, Young-Hoon Park, Yong Pyo Lim
<span title="2015-12-23">2015</span> <i title="Public Library of Science (PLoS)"> <a target="_blank" rel="noopener" href="" style="color: black;">PLoS ONE</a> </i> &nbsp;
An intraspecific genetic map for watermelon was constructed using an F 2 population derived from 'Arka Manik' × 'TS34' and transcript sequence variants and quantitative trait loci (QTL) for resistance to powdery mildew (PMR), seed size (SS), and fruit shape (FS) were analyzed. The map consists of 14 linkage groups (LGs) defined by 174 cleaved amplified polymorphic sequences (CAPS), 2 derived-cleaved amplified polymorphic sequence markers, 20 sequence-characterized amplified regions, and 8
more &raquo; ... sed sequence tagsimple sequence repeat markers spanning 1,404.3 cM, with a mean marker interval of 6.9 cM and an average of 14.6 markers per LG. Genetic inheritance and QTL analyses indicated that each of the PMR, SS, and FS traits is controlled by an incompletely dominant effect of major QTLs designated as pmr2.1, ss2.1, and fsi3.1, respectively. The pmr2.1, detected on chromosome 2 (Chr02), explained 80.0% of the phenotypic variation (LOD = 30.76). This QTL was flanked by two CAPS markers, wsb2-24 (4.00 cM) and wsb2-39 (13.97 cM). The ss2.1, located close to pmr2.1 and CAPS marker wsb2-13 (1.00 cM) on Chr02, explained 92.3% of the phenotypic variation (LOD = 68.78). The fsi3.1, detected on Chr03, explained 79.7% of the phenotypic variation (LOD = 31.37) and was flanked by two CAPS, wsb3-24 (1.91 cM) and wsb3-9 (7.00 cM). Candidate gene-based CAPS markers were developed from the disease resistance and fruit shape gene homologs located on Chr.02 and Chr03 and were mapped on the intraspecific map. Colocalization of these markers with the major QTLs indicated that watermelon orthologs of a nucleotide-binding siteleucine-rich repeat class gene containing an RPW8 domain and a member of SUN containing the IQ67 domain are candidate genes for pmr2.1 and fsi3.1, respectively. The results PLOS ONE |
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.1371/journal.pone.0145665</a> <a target="_blank" rel="external noopener" href="">pmid:26700647</a> <a target="_blank" rel="external noopener" href="">pmcid:PMC4689417</a> <a target="_blank" rel="external noopener" href="">fatcat:37mybqvghff4hk65vefonqh364</a> </span>
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