Heterosis in papaya: inter and intragroup analysis

Cardoso, Deisy Lúcia; Luz, Lucas Nunes da; Macedo, Célia Maria Peixoto de; Gonçalves, Leandro Simões Azeredo; Pereira, Messias Gonzaga

doi:10.1590/0100-2945-279/13

Cited by 16 publications

(14 citation statements)

References 5 publications

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“…The results of the present study are useful to guide researchers in papaya field experiments, since there is not a standard number of plants by plot and number of replications, as can be observed in the following studies: five plants by plot (OLIVEIRA et al, 2014), six plants by plot (REIS et al, 2015), eight plants by plot (DIAS et al, 2011), ten plants by plot (CARDOSO et al, 2014), twelve plants by plot (FERREIRA et al, 2012), and fifteen plants by plot (MESQUITA et al, 2007).…”

Section: Resultsmentioning

confidence: 88%

Optimum Plot Size and Number of Replications in Papaya Field Experiment

Schmildt

Cruz

et al. 2016

Rev. Bras. Frutic.

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ABSTRACT-The aim of this study was to estimate the optimum plot size and number of replications in papaya field experiments. Eleven variables were evaluated in four cultivars of papaya with planting in different seasons between 2011 and 2013 in the north of the Espírito Santo state. Analysis were made from blank test applied to 240 selected for planting season and cultivate plants in commercial fields. The determination of optimum plot size was performed by applying the methodologies of modified maximum curvature and maximum curvature of coefficient of variation. The determination of the number of repetitions was taken from the least significant difference in average 20% and 30%. The optimum plot size proved the same by the two methods studied for most evaluations. The optimum size required differs among cultivars, between variables and between planting seasons, with the largest number of plants was required for the variables number of fruits per plant and yield per plant. We conclude that the optimal number of papaya plants planted in the field is six plants per plot using three replications. Index terms: Carica papaya L., experimental precision, experimental planning. TAMANHO ÓTIMO DE PARCELAS E NÚMERO DE REPETIÇÕES EM EXPERIMENTOS DE CAMPO COM MAMOEIRORESUMO-Objetivou-se neste estudo estimar o tamanho ótimo de parcelas e o número de repetições em mamoeiro cultivado a campo. Avaliaram-se onze variáveis em quatro cultivares de mamoeiro com plantio em diferentes estações do ano entre 2011 e 2013 no norte do Espírito Santo. As análises foram feitas a partir de ensaio em branco aplicado em 240 plantas selecionadas, por época de plantio e por cultivar, em lavouras comerciais. A determinação do tamanho ótimo de parcela foi feita aplicando-se as metodologias de máxima curvatura modificado e máxima curvatura do coeficiente de variação. A determinação do número de repetições foi feita a partir da diferença mínima significativa da média de 20% e 30%. O tamanho ótimo da parcela se mostrou o mesmo pelas duas metodologias estudadas para a maioria das avaliações. O tamanho ótimo requerido difere entre as cultivares, entre as variáveis e entre as épocas de plantio, sendo que o maior número de plantas foi requerido para as variáveis número de frutos por planta e produção por planta. Concluiu-se que o número ótimo de plantas em experimentos de mamoeiro plantados a campo é de seis plantas por parcela com uso de três repetições. Termos para indexação: Carica papaya L., precisão experimental, planejamento experimental.

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Section: Resultsmentioning

confidence: 88%

Optimum Plot Size and Number of Replications in Papaya Field Experiment

Schmildt

Cruz

et al. 2016

Rev. Bras. Frutic.

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“…Our team of plant breeding studied the combination Sekati × JS12 in studies of combining ability and testers for development of hybrids (Ide et al 2009), diallel trials and heterosis studies (Cardoso et al 2014) and resistance to fungal diseases (Vivas et al 2013), since we are trying to obtain cultivars with characteristics of the Formosa group to reduce dependence on the import of hybrid seeds from Taiwan. Therefore, we propose optimizing methods to generate advanced breeding lines to evaluate and select superior homozygous genotypes (recombinant inbred lines) for traits related to yield and fruit quality.…”

Section: Discussionmentioning

confidence: 99%

Development of superior lines of papaya from the Formosa group using the pedigree method and REML/Blup procedure

et al. 2019

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Developing superior lines based on a simultaneous response from many traits of agronomic importance is a fundamental strategy to expand papaya cultivar supply, mainly the much-needed cultivars belonging to group Formosa. Our goal was to associate the pedigree method with REML/Blup procedure to select plants of progenies F 2:3 with superior agronomic performance. The variance components and genetic parameters were estimated using REML approach, and the genetic values were predicted using Blup methodology. The combined selection was performed using the IG2 selection index based on weights associated with agronomic values to indicate the best progenies and lines. The heritability estimates of progeny mean were high in most traits and evidenced significant genetic variability between progenies. The narrow-sense individual heritability was moderate in traits such as commercial fruits and soluble solid contents, which indicates a PLANT BREEDING -Article favorable condition for selections within progenies. The index was consistent in the selection of six superior progenies according to the assessed traits. This index also enabled promising genetic gains in traits of great interest such as yield and pulp thickness.Although the progenies are derived from self generations, they proved to be superior in traits of significant importance such as yield, commercial fruits, and pulp thickness when compared to the Tainung-01 hybrid, which is a worldwide-planted cultivar used as a reference to Formosa representatives. Six lines were selected within the superior progenies to continue the Formosa group-lines development program. The association of the pedigree method with REML/Blup procedure can be useful to assist breeders in an autogamous breeding program.

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“…Cultivar UC10 was obtained from a biparental cross between the genotypes UCJS-12 (originally from CNPMFT) and UCSekati (originally from Malaysia) of the Formosa group (Cardoso et al 2014). The genotypes used as parents were selected by the pedigree method ( Figure 1) and belong to the germplasm bank of the papaya breeding program UENF/ Caliman (Pereira et al 2015).…”

Section: Pedigree and Breeding Methodologymentioning

confidence: 99%