Fireblight Evaluation of Advanced Italian Selections and Cultivars of Pear

Rosati, Carlo; Rivalta, L.; Dradi, M.; Lezec, M. Le; Belouin, Andre; Chartier, R.

doi:10.17660/actahortic.2002.596.43

Cited by 8 publications

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“…Heredity of resistance to fire blight differs in pome fruit species such as Pyrus communis shows polygenic inheritance (Bell et al, 2005;Durel et al, 2004;Van der Zwet et al, 1974) while monogenic resistance is observed in P. pyrifolia, P. ussuriensis and some Malus species (Bokszczanin et al, 2012;Gardner et al, 1980;Thompson et al, 1962). Resistant individuals obtained from crossing susceptible × susceptible parents confirm the hypothesis that the fire blight resistance genes in pears are recessive Rosati et al, 2002). However, there is no study relating to the inheritance of fire blight resistance in quince.…”

Section: Introductionmentioning

confidence: 60%

“…On the contrary, when two moderately susceptible parents were crossed, a maximum resistance level could be obtained (Van der Zwet et al, 1974). Resistant individuals were also obtained from moderately resistant and/or susceptible combinations (Evrenosoğlu et al, 2014;Rosati et al, 2002). At this point, it should be considered that, genotype has an effect upon resistance to the disease at the rate of 1/3 in general and inheritance of fire blight resistance is low with minor effects (Bokszczanin et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

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Application of Hybridization Breeding Technique for Fire Blight Resistance on Cydonia Oblonga: A Base Study on Susceptibility, Heterosis, and Heterobeltiosis Parameters

Şahin¹,

Mısırlı

Gökkür³

et al. 2020

International Journal of Fruit Science

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Erwinia amylovora: Burrill. is the most important disease affecting quince cultivation and breeding of resistant varieties is seen as the key solution. As a result of hybridizations, 223 hybrids were obtained from 9 different combinations and susceptibility indexes (SI) of these hybrids were determined by artificial inoculations. Among the tested seven parental cultivars, Ege 25, Altın 35, Zeybek 35, and Ayva B-35 were found fire blight resistant while others were detected as moderately susceptible. SI of hybrids were changed between 14.77 and 52.94% regardless of hybrid combinations and 77.60% of obtained hybrids took place in resistant (10.1-30%) group. Reciprocal combinations showed that using resistant cultivar as a male parent was more effective than using maternal parent for transferring resistance. Heterosis (Ht) rates between combinations were found significant (p < .0004), while heterobeltiosis (Hbt) were not (p < .0623). Ht and Hbt ranged between −2.82-13.54 and −4.20-6.72 in populations, respectively. The maximum and significant heterotic effect was observed in Quince A × Ayva B-35 and its' reciprocal combination. In moderately susceptible × resistance combination, 83.33% of F 1 were determined to be resistant. On the other hand, hybrids from resistance × resistance combination were distributed in three groups as resistant, moderately susceptible and susceptible. According to these results, it could be said that (1) fire blight resistance genes in quince are recessive, (2) use of resistant varieties as pollinators is more successful in transferring resistance to hybrids, (3) open pollination treatment is an essential and easy way in terms of obtaining resistant hybrids if the orchard has resistant pollinator, and (4) heterobeltiosis for fire blight resistance is important.

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Section: Introductionmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Application of Hybridization Breeding Technique for Fire Blight Resistance on Cydonia Oblonga: A Base Study on Susceptibility, Heterosis, and Heterobeltiosis Parameters

Şahin¹,

Mısırlı

Gökkür³

et al. 2020

International Journal of Fruit Science

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“…Previous studies have shown that many widely cultivated cultivars, recognized for their overall value and fruit quality, are highly susceptible to fire blight [ 81 , 82 , 83 ], and the need for fire-blight-resistant cultivars is considered more pressing than ever [ 84 ]. There are various sources of genes identified for resistance to E. amylovora [ 85 , 86 , 87 ], and controlled hybridization is commonly used in breeding programs due to the generally polygenic nature of fire blight resistance and the complexity of its mechanism [ 88 , 89 , 90 ]. Probably, the complexity of genotypes’ responses and their inconstancy to fire blight attack emerged in the current study from their random classification in attack classes, without the frequency of the distribution resembling a quantitative histogram.…”

Section: Discussionmentioning

confidence: 99%

Comparative Analysis of Phenotypic and Molecular Data on Response to Main Pear Diseases and Pest Attack in a Germplasm Collection

Mărcășan

Oltean

Popa

et al. 2023

IJMS

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The pear is an important fruit tree in temperate areas, but due to its sensitivity, fruit yield and quality are often affected by disease and pest attacks. Pear genotypes from a germplasm collection comprising 13 Pyrus species, 17 Romanian varieties, and 50 non-Romanian varieties from a worldwide assortment were investigated in this study. Throughout four years, response to attack of the principal pathogens and pests was investigated phenotypically under natural conditions of infection and infestation. SSR markers were used to analyze the genetic diversity of the genotypes. A standardized method for the evaluation of responses to biotic stressors was proposed, which highlighted significant differences between genotypes. The species and varieties with the lowest degrees of attack (DA%), calculated based on the frequency and intensity of attack, were identified for pear scab (Venturia pyrina), septoria (Septoria pyricola), fire blight (Erwinia amylovora), and psyllids (Psylla sp.). These accessions could provide valuable sources of genes of interest to develop resistant varieties in new pear breeding programs. By combining phenotypic and molecular analyses, significant information was obtained that can be exploited to generate high variability for selection through artificial hybridization by harnessing accessions with complementary molecular fingerprints and high genetic distances.

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“…Hybridizations were performed between cultivars that bloom in the same period as susceptible x sus ceptible, susceptible x resistant, resistant x susceptible and resistant x resistant combinations (Rosati et al, 2002).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Susceptibility of Different Pear Hybrid Populations to Fire Blight (Erwinia amylovora)

Evrenosoğlu

Mısırlı

Saygılı

et al. 2011

Not Bot Hort Agrobot Cluj

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Fire blight disease caused by pathogenic bacterium Erwinia amylovora, is the serious disease of pear, and there is not a certain chemical management against this disease except antibiotic-type compounds such as streptomycin. It is very important to improve new fire blight resistant cultivars in case of integrated disease management. With this purpose, different crosses have been made between Pyrus communis varieties that have good fruit characteristics and resistant cultigens. Besides, self and open pollination treatments have been carried out in maternal plants. The disease resistance level of the hybrids obtained from these combinations was determined by artificial inoculations by Erwinia amylovora in greenhouse conditions. A total of 3284 hybrids were inoculated, and 2631 of them survived and were distributed to different susceptibility classes. 19.88% of the inoculated hybrids was killed by Erwinia amylovora. Total distribution of the hybrids to susceptibility classes was as 6.18% in class “A- slightly susceptible”, 3.11% in class “B- less susceptible”, 8.89% in class “C- mid-susceptible”, 20.28% in class “D- susceptible”, and 61.54% in class “E- very susceptible”. Majority of class “A- slightly susceptible” hybrids were obtained from ‘Magness’ x ‘Ankara’ combination. ‘Kieffer’ x ‘Santa Maria’, ‘Kieffer’ open pollination, ‘Magness’ x ‘Akça’, ‘Magness’ x ‘Kieffer’, ‘Magness’ x ‘Santa Maria’, ‘Mustafa Bey’ x ‘Moonglow’ treatments displayed good results with respect to “A- slightly susceptible” character. It is very important to evaluate these hybrid pear populations through different fruit and tree characteristics in the future.

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Fireblight Evaluation of Advanced Italian Selections and Cultivars of Pear

Cited by 8 publications

References 0 publications

Application of Hybridization Breeding Technique for Fire Blight Resistance on Cydonia Oblonga: A Base Study on Susceptibility, Heterosis, and Heterobeltiosis Parameters

Application of Hybridization Breeding Technique for Fire Blight Resistance on Cydonia Oblonga: A Base Study on Susceptibility, Heterosis, and Heterobeltiosis Parameters

Comparative Analysis of Phenotypic and Molecular Data on Response to Main Pear Diseases and Pest Attack in a Germplasm Collection

Evaluation of Susceptibility of Different Pear Hybrid Populations to Fire Blight (Erwinia amylovora)

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