Pear Breeding and Selection for Fire Blight Resistance

Thibault, B.; Paulin, J.P.

doi:10.17660/actahortic.1984.161.8

Cited by 5 publications

(5 citation statements)

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“…It has been proven that the selection of pear cultivars resistant to fire blight using phenotypic screening of breeding progeny is possible (Aldwinckle and van der Zwet 1979, Thibault and Paulin 1984, Hunter and Slingerland 2008). However, selection based entirely on phenotypic results is expensive, labour‐intensive and time‐consuming, because several replicates are necessary to estimate the level of fire blight resistance of genotypes and quarantine facilities are required in many countries (Khan et al.…”

Section: Discussionmentioning

confidence: 99%

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Redefinition of the map position and validation of a major quantitative trait locus for fire blight resistance of the pear cultivar ‘Harrow Sweet’ (Pyrus communis L.)

et al. 2012

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In a previous study, a QTL analysis was conducted on a pear F 1 progeny derived from a cross ÔPasse CrassaneÕ (PC) · ÔHarrow SweetÕ (HS). Four genomic regions associated with fire blight resistance were identified, including two main QTL located on linkage groups (LGs), 2A and 4 of ÔHarrow SweetÕ (HS02A and HS04). In the present study, we report the combination of LGs HS02A and HS02B into a single LG by mapping additional SSR loci from Malus or Pyrus spp. We could thereby precisely identify a single major QTL on LG HS02. We also confirm a putative QTL on LG HS04 by including new SSR markers to the pre-existing LG HS04. Based on SSR marker analysis of ÔHarrow SweetÕ pedigree, the major HS02 QTL is presumed to originate from the cultivar ÔEarly SweetÕ, while the HS04 QTL was traced from ÔHarrow SweetÕ back to ÔBartlettÕ. We also describe the validation of the major HS02 QTL for the fire blight severity trait in a second F 1 progeny derived from a cross ÔAngelysÕ · ÔHarrow SweetÕ.

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Section: Discussionmentioning

confidence: 99%

“…1968, Van der Zwet et al. 1974, Quamme and Bonn 1981, Thibault and Paulin 1984, Quamme et al. 1990).…”

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Redefinition of the map position and validation of a major quantitative trait locus for fire blight resistance of the pear cultivar ‘Harrow Sweet’ (Pyrus communis L.)

et al. 2012

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“…In this case, the MS3 fragment at 181 m/z was found to be a significant ion, which is known to be a characteristic RDA fragment for flavonoids that are methoxylated on the A ring, which is also the case with patuletin [73]. (20), 316 (11), 477(100), 478 (17), 479 (5), 519 (20), 593 (9) 283 (10), 299 (34), 314 (18), 315 (49), 316 (6), 342 (7), 462(100)…”

Section: Identification Of Pear Nectar Polyphenolicsmentioning

confidence: 78%

“…It is the major factor that significantly limits the cultivation of the European pear, especially in regions where springtime weather is warm and wet during blossoming [9]. Resistance to fire blight in the European pear was found by Hevesi et al [10] in Hungarian Sikulai and Szemes Alma cultivars, and in P. pyrifolia, P. ussuriensis or in hybrids between P. communis and these species [11].…”

Section: Introductionmentioning

confidence: 99%

The Morpho-Anatomy of Nectaries and Chemical Composition of Nectar in Pear Cultivars with Different Susceptibility to Erwinia amlylovora

et al. 2023

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The topography and morpho-anatomical characteristics of floral nectaries and the chemical analysis of nectar have been studied in seven pear cultivars with different susceptibility to Erwinia amylovora. The susceptible cultivar Williams, the moderately resistant cultivars Bella di guigno, Poire de Cure and the low susceptible cultivar Alexander Lucas originated from Pyrus communis, while highly resistant cultivars Chojuro and Nijisseiki from P. pyraster and Kieffer as interspecies hybrid P. communis × P. pyraster were included in this experiment and studied for the first time. Large differences in size and structure of the nectaries were observed in these seven pear cultivars. The epidermal cells were with cuticle being more or less striated in Alexander Lucas, Kieffer and Williams. Resistant cultivars had a narrow, elongated cell shape of epidermal cells while those susceptible had an isodiametric. Stomata were mesomorphic in all cultivars except in Poire de Cure and Williams, being slightly xeromorphic since they were situated in deep hollows. Guard cells of the modified stomata were much larger in resistant cultivars. Hypanthium cells were larger in resistant compared to susceptible cultivars. The most abundant sugars were glucose, fructose, sorbitol and sucrose in nectar of all studied pear cultivars. The resistant cultivars (Chojuro, Kieffer and Nijisseiki) had a ~2-fold higher level of sorbitol and galactose, ~2.2-fold higher isomaltose, ~2.7-fold turanose, ~3.35-fold maltose, ~4.4-fold melibiose and ~12.7-fold higher melesitose compared to susceptible cultivars. The sum of quantified phenolic acids varied from 0.049 (Williams) up to 4.074 µg CAE/mL (Kieffer), while flavonoid glycosides levels ranged from 1.224 (Williams) up to 11.686 µg RE/mL (Nijisseiki). In the nectar of the resistant cultivars, rutin, apigetrin, together with patuletin and luteolin glycosides were detected but not in susceptible cultivars, which could be considered as the markers of resistance.

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“…Several studies in the past indicated that fire blight resistance is polygenic, quantitative and controlled by multiple genes with additive effects (Quamme & Bonn, 1981; Quamme et al., 1990; Thibault & Paulin, 1984; Van Der Zwet et al., 1974). However, there is evidence that resistance is controlled by a major gene (Bell, 2019).…”

Section: Introductionmentioning

confidence: 99%

Detection of QTLs in a Mediterranean climate associated with fire blight necrosis length in Pyrus communis using a high‐resolution genetic linkage map

et al. 2021

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Fire blight caused by the bacterium Erwinia amylovora, is the most critical disease of European pear. Breeding of resistant cultivars is a possible solution for a growing demand for healthier alternative practices for disease control. In this study, we present a pear fire blight genetic study using a large F1 population. Quantitative trait loci (QTLs) were detected using a high‐resolution genetic map, allowing detection of QTLs with small intervals. A total of 162 offspring crossbred between ‘Harrow Sweet’ (HS, low susceptibility cultivar) and ‘Spadona’ (SPD, high susceptibility cultivar) were studied. We detected a significant genotype effect (p < .0001), which explained 46.4% of the variance of the necrosis length. A major QTL of the main genotype effect (AVG) was detected at 8.8 cM in linkage group (LG) 2 (LOD = 7.7). Additional QTLs were detected in LGs 7, 13 and 15. These markers can greatly contribute to pear breeding programs in a Mediterranean climate and can shed light on potential candidate genes that control fire blight resistance.

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Pear Breeding and Selection for Fire Blight Resistance

Cited by 5 publications

References 0 publications

Redefinition of the map position and validation of a major quantitative trait locus for fire blight resistance of the pear cultivar ‘Harrow Sweet’ (Pyrus communis L.)

Redefinition of the map position and validation of a major quantitative trait locus for fire blight resistance of the pear cultivar ‘Harrow Sweet’ (Pyrus communis L.)

The Morpho-Anatomy of Nectaries and Chemical Composition of Nectar in Pear Cultivars with Different Susceptibility to Erwinia amlylovora

Detection of QTLs in a Mediterranean climate associated with fire blight necrosis length in Pyrus communis using a high‐resolution genetic linkage map

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