2005
DOI: 10.1007/s00122-005-2002-z
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Identification of a major QTL together with several minor additive or epistatic QTLs for resistance to fire blight in apple in two related progenies

Abstract: Although fire blight, caused by the bacterium Erwinia amylovora, is one of the most destructive diseases of apple (Malus · domestica) worldwide, no major, qualitative gene for resistance to this disease has been identified to date in apple. We conducted a quantitative trait locus (QTL) analysis in two F 1 progenies derived from crosses between the cultivars Fiesta and either Discovery or Prima. Both progenies were inoculated in the greenhouse with the same strain of E. amylovora, and the length of necrosis was… Show more

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Cited by 119 publications
(112 citation statements)
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“…The F7 QTL was identified at 13, 20 and 27 DAI, and the same QTL could also be identified with AUDPC values which might be explained by the strong correlation between PLL measurements and AUDPC. In contrast to Calenge et al (2005), we could not identify any QTL at one week after inoculation which could be due to different strains or may be due to different methods of inoculation used in both studies (cutting vs. injection). Lesion measurements and PLL at 6, 13, 20 and 27 DAI showed significant differences (p<0.05) between progenies therefore, different intervals after inoculation (6, 13, 20 and 27 DAI) can be very informative about the disease development and could be used to calculate the AUDPC (Jorge and Verdier 2002).…”
Section: Discussioncontrasting
confidence: 84%
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“…The F7 QTL was identified at 13, 20 and 27 DAI, and the same QTL could also be identified with AUDPC values which might be explained by the strong correlation between PLL measurements and AUDPC. In contrast to Calenge et al (2005), we could not identify any QTL at one week after inoculation which could be due to different strains or may be due to different methods of inoculation used in both studies (cutting vs. injection). Lesion measurements and PLL at 6, 13, 20 and 27 DAI showed significant differences (p<0.05) between progenies therefore, different intervals after inoculation (6, 13, 20 and 27 DAI) can be very informative about the disease development and could be used to calculate the AUDPC (Jorge and Verdier 2002).…”
Section: Discussioncontrasting
confidence: 84%
“…Therefore, the F7 QTL can be considered to be a stable QTL since it is consistent in different genetic backgrounds and at least for two different E. amylovora strains. Minor QTLs identified by Calenge et al (2005) on linkage group 3 of cultivar 'Fiesta' and linkage groups 12 and 13 of cultivar 'Discovery' could not be identified in our experiments. The phenotypic variation explained by F7 QTL (37.5 -38.6%) was less than the broad sense heritability, indicating that there are additional genetic elements contributing to fire blight resistance that were not identified in this study.…”
Section: Discussioncontrasting
confidence: 75%
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