Análise dialélica em mamoeiro para resistência a mancha-de-phoma

Vivas, Marcelo; Silveira, Silvaldo Felipe da; Pereira, Messias Gonzaga; Cardoso, Deisy Lúcia; Ferreguetti, Geraldo Antônio

doi:10.1590/s0103-84782013005000054

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…This trend for heterosis estimates considering disease characters was also observed for specific combining ability estimates (28,27,31). On the other hand, for fruit quality attributes, a larger number of hybrids with the highest heterosis estimates were derived from crosses between the 'Solo' and 'Formosa' heterotic groups and within the 'Formosa' group (Table 1).…”

Section: Resultssupporting

confidence: 56%

Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits

et al. 2018

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This study aimed to verify if the genetic divergence between papaya lines, obtained by means of molecular markers, is correlated with heterosis in the hybrids for characteristics related to production, fruit quality and disease resistance. Eight parents and 56 hybrids obtained from diallel crosses were evaluated in randomized blocks, with four replicates. The number of commercial fruits (NCF), the average fruit weight (AFW), the productivity (PROD), the fruit firmness (FIRM) and the total soluble solids (TSS) were evaluated, as well as the severity of black spot on leaves (BSS) and fruits (BSSFr), phoma spot (PSS) and powdery mildew on leaves (PMS). Correlations were estimated between genetic divergence, obtained based on Vivas, M.; Cardoso, D.L.; Ramos, H.C.C.; Santos, P.H.D.; Silveira, S.F.; Moraes, R.; Pereira, M.G. Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits. Summa Phytopathologica, v.44, n.1, p.110-115, 2018. SSR, and heterosis, estimated for each characteristic in four possibilities of crossings within the diallel: i) all crossings; ii) between parents of the 'Solo' group; iii) between parents of the 'Formosa' group; and iv) between parents of 'Solo' with 'Formosa' group and 'Formosa' with 'Solo' group. Results indicate the possibility of exploring heterosis both in crossings between groups and in crossings within groups. The low magnitude of the estimates of correlation between heterosis and morphological characteristics of the hybrids with genetic distance obtained by SSR in the parents indicates that the behavior of hybrids cannot be inferred based on the genetic divergence between parents.Keywords: Carica papaya, diallel, hybridization, plant breeding.Papaya (Carica papaya L.), one of the tropical plants with major importance for the national and world's fruit production, is cultivated in several Brazilian states. One of the bottlenecks of this crop is the lack of commercial varieties and hybrids that meet the requirements of the domestic and external market; thus, breeding programs with this attempt should be intensified. Breeding programs in papaya aim to obtain lineages and use them in hybridization programs with the focus on hybrid vigor or heterosis, a phenomenon that provides great productivity to hybrids from the crossing of highly divergent parents.In papaya, the possibility of exploring heterosis is already reported for morpho-agronomic characteristics (5, 17), physiological seed quality (19) and disease resistance (13,27,29,26). Falconer (9) suggests that, at any degree of dominance above zero, heterosis is a function of allele frequency between the parents; therefore, there is a positive correlation between genetic divergence and heterosis. For this reason, lineage diversity estimates can be used as a predicting tool of superior crosses in plant breeding programs (14). Studies with lineages obtained from the populations BR-105 and BR-106, correlating productivity and genetic divergence es...

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Section: Resultssupporting

confidence: 56%

Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits

et al. 2018

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“…Similarly, as observed for morpho-agronomic characters (Marin et al 2006) and physiological quality of seeds (Martins et al 2009) in papaya, heterosis is a common effect for traits associated with resistance to papaya fungal diseases. Recently, Vivas et al (2012bVivas et al ( , 2013 pointed out that heterosis in papaya for resistance to black spot and to phoma spot may provide significant genetic gains, thereby contributing to the reduction of chemical control in the crop. It was possible to identify papaya hybrids with potential for reducing the incidence and severity of black spot and of phoma spot, especially the hybrids 'Americano' x 'São Mateus' and 'Americano' x 'Waimanalo'.…”

Section: Resistance To Phoma Spotmentioning

confidence: 99%

Heterosis and genetic diversity for selection of papaya hybrids for resistance to black spot and phoma spot

Vivas

Ramos

Santos

et al. 2016

Trop. plant pathol.

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In this work, two experiments were set up in order to select papaya hybrids and verify heterosis expression for black spot (Asperisporium caricae) and phoma spot (Stagonoparopsis caricae) resistance. Experiments were set up in randomized blocks with two replications. Black spot and phoma spot incidence and severity on leaves were evaluated, and fruit damaged area by black spot was estimated. These characteristics were used to estimate genetic distance with complement of Jaccard's Index. For black spot resistance, 77 % of hybrids showed heterosis for at least one of three evaluated characteristics and 58 % of hybrids showed heterobeltiosis effect. For phoma spot severity, there was heterosis manifestation in 56 % of hybrids, and 30 % of them showed heterobeltiosis effect. Therefore, heterosis was found in most of the hybrids, emphasizing the possibility of using hybridization to develop resistant genotypes. We observed that the best estimates of heterotic effects were obtained by crossing genetically distant individuals, indicating the existence of a positive relationship between genetic distance and hybrid performance. Together, the results highlight the hybrid 'Americano' x 'Waimanalo' as having a strong potential to reduce the intensity of these two diseases.

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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%

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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Análise dialélica em mamoeiro para resistência a mancha-de-phoma

Cited by 17 publications

References 10 publications

Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits

Genetic diversity between papaya lines and their correlation with heterosis in hybrids for disease resistance and morpho-agronomic traits

Heterosis and genetic diversity for selection of papaya hybrids for resistance to black spot and phoma spot

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

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