Scab Resistance in Pyrus Germplasm

Postman, Joseph D.; Spotts, R. A.; Calabro, Jill M.

doi:10.17660/actahortic.2005.671.84

Cited by 17 publications

(25 citation statements)

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“…x bretschneideri cultivar 'Houbali'. Postman et al (2005) also found that P. pyrifolia cultivars generally were resistant to leaf scab in the field, although 'Kosui' and 'Seigyoku' did show low levels of infection.…”

Section: Discussionmentioning

confidence: 88%

“…Abe et al (2008) also reported leaf and fruit non-host resistance in European pear cultivars 'Bartlett', 'La France', and their offspring to V. nashicola in artificial inoculation tests. Postman et al (2005) found in glasshouse inoculation tests that no Asian cultivar developed leaf infection following inoculation with V. pirina. However, field results by Postman et al (2005) showed that hybrids between Asian and European pear were rated intermediate for both leaf and fruit infection, and that these hybrid pears did not differ significantly from European pears.…”

Section: Discussionmentioning

confidence: 99%

“…Postman et al (2005) found in glasshouse inoculation tests that no Asian cultivar developed leaf infection following inoculation with V. pirina. However, field results by Postman et al (2005) showed that hybrids between Asian and European pear were rated intermediate for both leaf and fruit infection, and that these hybrid pears did not differ significantly from European pears. Our results indicated that where interspecific hybrids had been backcrossed to European pear and where the average percentage of Asian parentage was 25% or less, the infection rates for some families were also more similar to those of the European family studied.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, cultivars of the Asian pears Pyrus pyrifolia Nakai and Pyrus x bretschneideri Rhed., which generally are susceptible to V. nashicola Tanaka & Yamamoto, are highly resistant or immune to infection by V. pirina (Vondracek 1982;Chevalier et al 2002;212 New Zealand Journal of Crop andHorticultural Science, 2009, Vol. 37 Villalta et al 2004;Postman et al 2005), because they are non-hosts for this species.…”

Section: Introductionmentioning

confidence: 97%

“…It is most severe in regions where regular rainfall or heavy dews occur in the spring when young leaves are expanding and are at their most susceptible (Li & Zhao 2001;Villalta et al 2004;Spotts et al 2005). The ontogenic resistance of the leaves increases as they mature to a stage where they become impervious to infection (Postman et al 2005). Gene-for-gene relationships are assumed for the V. pirina AderhJPyrus communis L. interaction, as at least five races of the scab pathogen have been described (Shabi et al 1973;Bell 1990).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Resistance to scab caused byVenturis pirinain interspecific pear (Pyrusspp.) hybrids

Brewer¹,

Alspach

Morgan

et al. 2009

New Zealand Journal of Crop and Horticultural Science

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The genetics of resistance to Venturia pirina was investigated from 2002 to 2004 on 11 families derived from interspecific crosses between European and Asian pear species. Nearly complete leaf resistance to V. pirina was identified in all progeny of families with at least 50% Asian pear (Pyrus pyrifolia and/or Pyrus × bretschneideri) ancestry, but up to 26% of these trees exhibited fruit scab incidence in any one of three years. However, between 67% and 80% of the scab leaf resistant individuals had fruit russet spotting owing to scab infection in one or more years over the duration of the trial and between 14% and 36% of the leaves were affected by russet spot. The level of affected individuals did not appear to decrease with increasing proportion of Asian parentage for leaves or fruit. In contrast, reference families derived from European pears and many of the families with 12-25% Asian parentage were almost 100% susceptible to scab on both leaves and fruit. In European families, only 2% of these individuals had leaves affected by russet spotting, whereas an average of 23% of fruit were affected. The genetics of non-host resistance is discussed.

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Section: Discussionmentioning

confidence: 88%