Assessment of the Susceptibility to Erwinia Amylovora of 90 Varieties or Selections of Pear

Thibault, B.; Lecomte, Pascal; Hermann, Léonce; Belouin, Andre

doi:10.17660/actahortic.1987.217.53

Cited by 15 publications

(6 citation statements)

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“…2. Evaluation of the susceptibility by artificial inoculation (Thibault et al, 1987) Susceptibility of hybrid (%) 0-10 11-20 21-40 41-60 61-100 brids were killed by disease. Inoculated hybrid number of 'Akça' cultivar was 160, and only 6 of them were in class "A".…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…2, and susceptibility classes and characters of hybrids were detected (Fig. 5A-E) (Thibault et al, 1987).…”

Section: Methodsmentioning

confidence: 96%

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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“…x 100 Toplam Sürgün Uzunluğu (cm) Değerler Thibault et al (1987)'nin uyguladığı aşağıda gösterilen tabloya göre uyarlanmış ve melez bireyler için uygun skorlama olan A dan E'ye kadar harflendirilen duyarlılık düzeylerine göre skorlama yapılarak melez bireylerin duyarlılık karakterleri ve sınıfları ortaya konulmuştur (Çizelge 1).…”

Section: Materyalunclassified

“…Suni inokulasyona göre duyarlılık değerlendirilmesi (Thibault et.al., 1987) Table 1. Evaluation of susceptibility through artificial inoculation (Thibault et al, 1987) The most susceptibility ARAŞTIRMA BULGULARI ve TARTIŞMA Farklı melezleme kombinasyonlarından elde edilen melez bitkilerin, iki kez suni inokulasyonu sonucunda, dayanıklılık gruplarına göre dağılımı incelendiğinde, %11,91'inin "çok az duyarlı" A, %3,99'unun "az duyarlı" B, %6,62'sinin "orta derecede duyarlı" C, %18,07'sinin "duyarlı" D ve %59,41'inin "çok duyarlı" E grubunda yer aldığı görülmektedir. Ayrıca melez bitkilerin %49,42'si hastalık sonucu tamamen kuruduğu için değerlendirmeye alınmamıştır (Çizelge 2).…”

Section: Materyalunclassified

F1 Melez Armut Populasyonunun Ateş Yanıklığı Hastalığı Etmeni Erwinia amylovora Karşı Reaksiyonunun Belirlenmesi

Evrenosoğlu¹,

Mısırlı²,

Aysan³

et al. 2014

Ege Üniversitesi Ziraat Fakültesi Dergisi

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ÖZET teş Yanıklığı hastalığına dayanıklı armut tiplerinin belirlenmesini amaçlayan bu çalışmada, melez armut bireylerin Ateş Yanıklığı hastalığı etmeni Erwinia amylovora'ya karşı duyarlılık durumu suni inokulasyonla ortaya konmuştur. Bireylerin testlemesinde, 75 farklı E. amylovora izolatı içinden, elma ve armut sürgünlerinde yapılan patojenite testlerine göre virulensi yüksek olan 7 izolat seçilerek kullanılmıştır. Melez bireyler bu izolatların eşit oranda karışımlarından oluşan E. amylovora süspansiyonu ile Ağustos 2010 ve Mayıs 2011 tarihlerinde sürgün injeksiyonuyla iki kez inokule edilmiştir. Sürgün yanıklığı oranına göre yapılan değerlendirmede, testlenen 7495 melez bitkiden, %11,91'u "çok az duyarlı", %3,99'u "az duyarlı", %6,62'si "orta derecede duyarlı", %18,07'si "duyarlı" ve %59,41'i "çok duyarlı" grupta yer almıştır. Dayanıklı Magness çeşidinin ana ebeveyn olarak kullanıldığı kombinasyonlarda "çok az duyarlı" grupta yer alan birey sayısının yüksek olduğu görülmüştür. ABSTRACT n this study, susceptibility levels of different hybrid pear individuals were determined against fire blight disease agent Erwinia amylovora by artificial inoculations. According to the pathogenity tests of 75 different E. amylovora strains, made on apple and pear shoots, highly virulent 7 strains were used in the testing of the hybrids. E. amylovora suspension was prepared with equal mixes of these 7 selected strains. This suspension was inoculated to hybrid plants by shoot injections that carried out twice, in August 2010 and May 2011. According to the evaluations made through necrotic shoot rate, totaly 7495 hybrid seedlings inoculated, and 11,91% of them were "the least susceptible" 3,99% were "less susceptible", 6,62% were "moderately susceptible", 18,07% were "highly susceptible", 59,41% were "the most susceptible". More "the least susceptible" pear hybrids were obtained from the combinations of resistant Magness cultivar than the other combinations.

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“…The resistance in P. communis is relatively rare with only 5% -10% being rated as at least moderately resistant [6][7][8]. In the European pear cultivars different levels of susceptibility to fire blight are observed.…”

Section: Introductionmentioning

confidence: 99%

Inheritance of fire blight resistance in Asian <i>Pyrus</i> species

Bokszczanin¹,

Przybyla²,

Schollenberger³

et al. 2012

OJGen

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Since several Asian pear species are considered to be potential source of fire blight resistance, we crossed 'Doyenné du Comice', the susceptible European cultivar, with four Asian pear species. The aim of the study was to establish the level of resistance of each genotype and the mode of transmission of fire blight resistance to each F 1 full-sib progeny. The best sources of resistance were P. ussuriensis 18 and P. ussuriensis var. ovoidea 8 ranked to resistant and highly resistant, respectively. Although pear resistance to fire blight is suggested to be polygenic, distribution of phenotypes in 'Doyenné du Comice' × P. ussuriensis var. ovoidea 8 hybrid family suggests the possibility of monogenic inheritance with the dominance of resistance derived from P. ussuriensis var. ovoidea 8. Polygenic inheritance of pear resistance to fire blight was identified in cross combinations of 'Doyenné du Comice' with P. pyrifolia 6, and contributed by the major gene, with P. ussuriensis 18 and P. calleryana 12. Transgressive segregation was observed within the progenies of susceptible, moderately susceptible and resistant parents.

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Assessment of the Susceptibility to Erwinia Amylovora of 90 Varieties or Selections of Pear

Cited by 15 publications

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

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

F1 Melez Armut Populasyonunun Ateş Yanıklığı Hastalığı Etmeni Erwinia amylovora Karşı Reaksiyonunun Belirlenmesi

Inheritance of fire blight resistance in Asian <i>Pyrus</i> species

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Assessment of the Susceptibility to Erwinia Amylovora of 90 Varieties or Selections of Pear

Cited by 15 publications

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

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

F1 Melez Armut Populasyonunun Ateş Yanıklığı Hastalığı Etmeni Erwinia amylovora Karşı Reaksiyonunun Belirlenmesi

Inheritance of fire blight resistance in Asian &lt;i&gt;Pyrus&lt;/i&gt; species

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Inheritance of fire blight resistance in Asian <i>Pyrus</i> species