Eggplant cultivation is limited by numerous diseases, including the devastating bacterial wilt (BW) caused by the species complex (RSSC). Within the RSSC, (including phylotypes I and III) causes severe damage to all solanaceous crops, including eggplant. Therefore, the creation of cultivars resistant to strains is a major goal for breeders. An intraspecific eggplant population, segregating for resistance, was created from the cross between the susceptible MM738 and the resistant EG203 lines. The population of 123 doubled haploid lines was challenged with two strains belonging to phylotypes I (PSS4) and III (R3598), which both bypass the published BW-resistance quantitative trait locus (QTL). Ten and three QTLs of resistance to PSS4 and to R3598, respectively, were detected and mapped. All were strongly influenced by environmental conditions. The most stable QTLs were found on chromosomes 3 and 6. Given their estimated physical position, these newly detected QTLs are putatively syntenic with BW-resistance QTLs in tomato. In particular, the QTLs' position on chromosome 6 overlaps with that of the major broad-spectrum tomato resistance QTL . The present study is a first step towards understanding the complex polygenic system, which underlies the high level of BW resistance of the EG203 line.
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| http://dx.doi.org/10.3390/ijms19020357 | DOI Listing |
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