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        Development of a high-resolution melting marker for selecting Fusarium crown and root rot resistance in tomato

        Kim, Bichseam,Kim, Nahui,Kim, Jun Young,Kim, Byung Sup,Jung, Hee-Jeong,Hwang, Indoek,Noua, Ill-Sup,Sim, Sung-Chur,Park, Younghoon,Belzile, F. Canadian Science Publishing 2016 Genome Vol.59 No.3

        <P> Fusarium crown and root rot is a severe fungal disease of tomato caused by Fusarium oxysporum f. sp. radicis-lycopersici (FORL). In this study, the genomic location of the FORL-resistance locus was determined using a set of molecular markers on chromosome 9 and an F2 population derived from FORL-resistant inbred ‘AV107-4’ (Solanum lycopersicum) × susceptible ‘L3708’ (Solanum pimpinellifolium). Bioassay performed using Korean FORL strain KACC 40031 showed single dominant inheritance of FORL resistance in the F2 population. In all, 13 polymerase chain reaction-based markers encompassing approximately 3.6-72.0 Mb of chromosome 9 were developed based on the Tomato-EXPEN 2000 map and SolCAP Tomato single nucleotide polymorphism array analysis. These markers were genotyped on 345 F2 plants, and the FORL-resistance locus was found to be present on a pericentromeric region of suppressed chromosomal recombination in chromosome 9. The location of the FORL-resistance locus was further confirmed by testing these markers against diverse commercial tomato and stock cultivars resistant to FORL. A restriction fragment length polymorphism marker, PNU-D4, located at approximately 6.1 Mb of chromosome 9 showed the highest match with the resistance locus and was used for conducting high-resolution melting analysis for marker-assisted selection of FORL resistance. </P>

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