Evaluation of different sources of resistance for breeding powdery mildew resistant grapevine varieties

Abstract

The appearance of resistance to powdery mildew was investigated on seedling progenies of interspecific crossings. Hybrids of American and East-Asian wild species and one Vitis vinifera variety (Janjal kara) were used as source of resistance in the crossings. The resistance of foliage and of berries were tested in the field at the time of vintage. The degree of resistance was ranked into six classes.
 In American and Asian hybrid derivatives there were few highly resistant progenies, but in the hybrids of Janjal kara variety more than 90 % of the progenies proved to be highly resistant to powdery mildew. According to the distribution of classes of resistance in the populations the resistance of American and Asian sources are mostly influenced by additive gene affects. The resistance of Janjal kara seemed to be mono or digenic.
 No close correlation was found between the powdery mildew resistance of the foliage and that of the berries.

Resistance evaluation of some commercial Vitis vinifera varieties to powdery mildew Erysiphe necator Schwein. in two regions of Iran

“…In general, results of the experiments indicated that 18.18% of tested varieties were immune to the disease, 13.63% were highly resistant, 9.10% were resistant, 9.10% were tolerant, 36.36% were susceptible and 13.63% highly susceptible to powdery mildew disease (Table 1). Results of our study and the differences in the reaction of varieties to powdery mildew disease are in agreement with those of previous studies (Barker et al, 2005;Eibach et al, 2007;Korbuly, 1999;Li, 1993;Wan et al, 2007). Voytovich (1987), Wang et al (1995), Staudt (1997), Donald et al (2002), Fisher et al (2004, Kozma et al (2009), Molnar et al (2007) who studied the reaction of different grape varieties to powdery mildew disease in different countries have reported more or less the same results.…”

“…Monogenic resistance to E. necator has been studied in Muscadinia spp. and its hybrids with Vitis vinifera (Korbuly, 1999;Kozma et al, 2009;Molnar et al, 2007;Pauquet et al, 2001). In the Vitis genus, resistance appears to be due to several genes (Fisher et al, 2004).…”

“…Methods are needed to identify valuable sources of resistance and to assist breeders in production of resistant cultivars or hybrids against powdery mildew. Determination of host resistance was based on field observations (Staudt, 1997), tests on leaf disks (Korbuly, 1999;Wang et al, 1995) or in vitro experiments (Kitao and Doazan, 1990).…”

“…Powdery mildew resistance has also been explored in grapes of the genus Muscadinia. The first studied resistance locus against PM was Run1 (Donald et al, 2002;Korbuly, 1999). Run1 was introduced from M. rotundifolia by conventional breeding and was localized on linkage group 12 (Barker et al, 2005).…”

Powdery Mildew Resistance Genes in Vines: An Opportunity to Achieve a More Sustainable Viticulture

“…Unlike other resistance loci, Ren1 was found in V. vinifera and not in a wild Vitis species. It was discovered in the Asian table grape varieties 'Dhandzhal Kara' [92] and 'Kishmish vatkana' [93], which show complete resistance to powdery mildew [94]. Hoffman et al [59] and Coleman et al [95] described that the resistance conferred by Ren1 behaves as a Mendelian monogenic trait.…”