Reação de germoplasma e híbridos de mamoeiro à mancha-de-phoma (Phoma caricae-papayae) em condições de campo

Vivas, Marcelo; Silveira, Silvaldo Felipe da; Eduardo, Carlos; Terra, Pessanha da Silva; Gonzaga, Messias Pereira

doi:10.1590/s1982-56762010000500009

Cited by 20 publications

(29 citation statements)

References 3 publications

(2 reference statements)

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“…Santos et al (2009) pointed out genotype 'Tailandia' as resistant to powdery mildew, as it showed the lowest incidence of papaya leaves with this disease symptoms, in a greenhouse. Vivas et al (2010) highlighted the genotypes 'Americano', 'JS 12', 'Baixinho de Santa Amália', 'Waimanalo', 'Sekati', 'Maradol' and 'Tailandia' as resistant to phoma spot. Thus, there is possibility of obtaining hybrids that have lower levels of black spot, powdery mildew and phoma spot, considering that nearly 90% of the selected hybrids had at least one parent of the genotypes mentioned above.…”

Section: Smith and Hazel Esek And Bakermentioning

confidence: 99%

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Prediction of genetic gain from selection indices for disease resistance in papaya hybrids

2012

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RESUMO Predição de ganhos genéticos para resistência a doenças por índices de seleção em híbridos de mamoeiroCom a finalidade de selecionar híbridos superiores para concentração de alelos favoráveis à resistência de mamoeiro à pinta-preta, oídio e mancha de phoma, foram avaliados, em duas épocas, em 2007, 67 híbridos simples, em delineamento de blocos casualizados com duas repetições. Os ganhos genéticos foram estimados a partir dos índices de seleção de Smith & Hazel, Pesek & Baker, Williams e Mulamba & Mock, com intensidade de seleção de 22,39%, correspondendo a 15 híbridos. O índice de Mulamba & Mock evidenciou ganhos mais adequados para as cinco características avaliadas, quando utilizado o critério de peso econômico atribuído por tentativas. Em conjunto, as severidades da pinta-preta em folhas e em frutos, características consideradas de maior interesse para a seleção de materiais resistentes, expressaram ganho percentual de -44,15%. Além disso, registraram-se ganhos para as demais características, com ganho percentual seletivo predito negativo. Conclui-se, portanto, que o uso do índice de Mulamba & Mock é o procedimento mais eficiente para seleção simultânea de híbridos de mamoeiro resistentes à pinta-preta, oídio e mancha de phoma.

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Section: Smith and Hazel Esek And Bakermentioning

confidence: 99%

“…However, the complete resistance has not been observed in commercial genotypes of the species that have already gone through cycles of selection (Vivas et al, 2010(Vivas et al, , 2012. There is, however, the possibility of crosses generate hybrids that provide higher levels of resistance to fungal diseases.…”

Section: Introductionmentioning

confidence: 99%

Prediction of genetic gain from selection indices for disease resistance in papaya hybrids

2012

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“…Although there are breeding work aimed at achieving phoma-spot-resistant cultivars (Vivas et al, 2010;2013a), there are no commercial varieties with complete or costeffective resistance (Vivas et al, 2010). In this way, there is a need to broaden the genetic basis of this crop as well as to intensify researches that focus on the genetic resistance of papaya to diseases in general.…”

Section: Introductionmentioning

confidence: 99%

“…Incidence (%) of leaves with symptoms of phoma-spot was calculated as the ratio of number of leaves with symptoms by the total number of leaves per plant multiplied by one hundred. The severity of phoma-spot was visually estimated at the 5 th fully expanded leaf with a diagrammatic scale adopted by Vivas et al (2010).…”

Section: Introductionmentioning

confidence: 99%

Seleção de progênies femininas de mamoeiro para resistência a mancha-de-phoma via modelos mistos

et al. 2014

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Landrace genotypes present sources of genes for adaptation, rusticity and resistance to diseases and environmental stress. This study evaluated the potential of landrace papaya genotypes in contributing to phoma-spot resistance genes. The experiment was a randomized block design with six replications consisted of 24 half-sib progenies of dioecious papaya -which segregated for sex. Only plants with female flowers were evaluated. We used mixed models to estimate variance components and the genetic value of landraces to incidence and severity of phoma-spot. Heritability estimates and selective accuracy demonstrated a favorable situation to the selection of resistant progenies ,especially 'STA-02', 'STA-04', 'STA-05', 'STA-06', 'STA-07', 'STA-11', 'STA-12', 'STA-16', 'STA-21' and 'STA-22', which showed negative values of additive genetic effects for both incidence and severity of phoma-spot.

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“…Barreto). Because no genotype is resistant to these diseases (Dianese et al, 2007;Vivas et al, 2010Vivas et al, , 2012c, spraying with fungicides has become the primary control measure. However, pesticide residues create an obstacle for papaya export from Brazil.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of circulant diallels via mixed models in the selection of papaya genotypes resistant to foliar fungal diseases

et al. 2014

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ABSTRACT. Diallel crossing methods provide information regarding the performance of genitors between themselves and their hybrid combinations. However, with a large number of parents, the number of hybrid combinations that can be obtained and evaluated become limited. One option regarding the number of parents involved is the adoption of circulant diallels. However, information is lacking regarding diallel analysis using mixed models. This study aimed to evaluate the efficacy of the method of linear mixed models to estimate, for variable resistance to foliar fungal diseases, components of general and specific combining ability in a circulant table with different s values. Subsequently, 50 diallels were simulated for each s value, and the correlations and estimates of the combining abilities of the different diallel combinations were analyzed. The circulant diallel method using mixed modeling was effective in the classification of genitors regarding their combining abilities relative to the complete diallels. The numbers of crosses in which each genitor(s) will compose the circulant diallel and the estimated heritability affect the combining ability estimates. With three crosses per parent, it is possible to obtain good concordance (correlation above 0.8) between the combining ability estimates.

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Reação de germoplasma e híbridos de mamoeiro à mancha-de-phoma (Phoma caricae-papayae) em condições de campo

Cited by 20 publications

References 3 publications

Prediction of genetic gain from selection indices for disease resistance in papaya hybrids

Prediction of genetic gain from selection indices for disease resistance in papaya hybrids

Seleção de progênies femininas de mamoeiro para resistência a mancha-de-phoma via modelos mistos

Efficiency of circulant diallels via mixed models in the selection of papaya genotypes resistant to foliar fungal diseases

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