Bragantia (2012) 71, 455-459

Marcelo Vivas, Silvaldo Felipe da Silveira, Deisy Lúcia Cardoso, Messias Gonzaga Pereira, Janieli Maganha Silva Vivas and Geraldo Antônio Ferreguetti (2012)
Capacidade combinatória em mamoeiro para resistência a oídio
[Combining ability for resistance to powdery-mildew in papaya]
Bragantia 71 (4), 455-459
Abstract: Genetic resistance represents a sustainable alternative to control powdery-mildew in papaya crop. Diallelic crosses were performed among eight papaya genotypes, belonging to 'Solo' and 'Formosa' heterotic groups, four from each one with aiming to indicate possible hybrid combinations that contribute to reducing the severity of powdery-mildew on leaf. The 56 hybrid combinations (F1's and reciprocals) along with their parents were evaluated in a randomized complete block design with four replications. Powdery-mildew severity on leaves was measured in March and May 2010, respectively, at 11 and 13 months after planting. The general and specific combining ability were estimated from the severity data. Thus, considering the estimates of combining ability, the hybrids 'Maradol x Waimanalo', 'Maradol x Sunrise Solo 72/12', 'JS 12-4 x São Mateus', 'Sekati x Waimanalo', 'Sekati x Golden', 'Sekati x Sunrise Solo 72/12', 'Sekati x São Mateus', 'Waimanalo x São Mateus' e 'Golden x São Mateus' are the best combinations for the parents assessed to the severity of powdery-mildew. The results also show the possibility of obtaining hybrids with potential for reducing the severity of powdery-mildew, from crosses between genotypes of the groups 'Solo' and 'Formosa' and at crossings within the 'Solo' group.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Silvaldo Felipe da Silveira

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phyllactinia caricicola	Papaya (Carica papaya)	Brazil (south)