Productivity and quality of Formosa and Solo papaya over two harvest seasons

Abstract

-The objective of this work was to evaluate the productivity and quality of papaya fruits (Carica papaya) of the Solo (12 genotypes) and Formosa (9 genotypes) heterotic groups over two harvest seasons. The experiment was conducted under field conditions in the municipality of Pinheiros, in the state of Espírito Santo, Brazil, in a randomized complete block design. Ten morpho-agronomic and physicochemical variables of the fruits were measured in winter (210-300 days after planting) and summer (450-540 days after planting). The data were subjected to the combined analysis of variance, to the breakdown of the genotype x environment interactions, and to the grouping of means by the Scott-Knott test. Although harvest season affected the evaluated characteristics, it did not alter the classification of the genotype. In the Solo group, the H 36-45 and UC 15 hybrids stand out due to their greater productivity, fruit weight, and soluble solids contents. In the Formosa group, the Rubi Incaper 511 cultivar shows greater productivity, higher number of commercial fruits, and lower number of deformed fruits over both evaluated harvest seasons.Index terms: Carica papaya, agronomic performance, environmental effect, genotype evaluation. Produtividade e qualidade de frutos de mamão Formosa e Solo em duas épocas de colheitaResumo -O objetivo deste trabalho foi avaliar a produtividade e a qualidade de frutos de mamoeiro (Carica papaya) dos grupos heteróticos Solo (12 genótipos) e Formosa (9 genótipos), em duas épocas de colheita. O experimento foi conduzido em condições de campo em Pinheiros, ES, em delineamento de blocos ao acaso. Dez variáveis morfoagronômicas e físico-químicas dos frutos foram avaliadas no inverno (210 a 300 dias após o plantio) e no verão (450 a 540 dias após o plantio). Os dados foram submetidos à análise de variância conjunta, à decomposição da interação genótipo x ambiente e ao agrupamento das médias pelo teste de Scott-Knott. Embora a colheita em diferentes épocas tenha influenciado as características avaliadas, não alterou a classificação dos genótipos. No grupo Solo, destacam-se os híbridos H 36-45 e UC 15, por suas maiores produção e massa do fruto e por seu alto teor de sólidos solúveis. No grupo Formosa, a cultivar Rubi Incaper 511 apresenta maior produção, maior número de frutos comerciais e menor número de frutos deformados nas duas épocas de colheita avaliadas.Termos para indexação: Carica papaya, desempenho agronômico, efeito ambiental, avaliação de genótipos.

Quality of 'Tainung no. 1' papaya in function of production times and irrigation managements

“…Berilli et al (2007) monitored the growth rate of 'UENF/CALIMAN 01 (UC01)' papaya in relation to the accumulation of degree-days at three different times of the year, and observed that the fruits produced in August were shorter, assuming, therefore, that warmer periods during fruit development provide longer lengths in papaya, corroborating with what occurred in this study. In contrast, Barros et al (2017) did not observe differences in the length of Tainung no. 1 papaya from different crops (winter and summer) cultivated in Espírito Santo state, Brazil.…”

Intrapopulation recurrent selection by mixed models in papaya of the formosa group

“…In the present study, all variables evaluated had averages lower than those reported by Cattaneo et al (2010) (Table 1). However, Barros et al (2017) observed that in the summer 'Rubi Incaper 511' had FM of 1,185 g and PT of 2.84 cm and in winter FM was 1,456 g and PT of 3.21 cm, evidencing the environmental interference in the expression of these characteristics.…”

Selection index based on phenotypic and genotypic values predicted by REML/BLUP in Papaya

“…Oliveira et al (2012) observed heritability of 18% for SS. The low heritability estimates can be attributed to the narrow genetic base of the population, which reduces the available genetic variability (BARROS et al, 2017;PINTO et al, 2013), as well as the effects of climate and of the nutritional conditions of the crop on fruit development. These results indicate that to improve the heritability coefficient, it is necessary to use strategies such as increasing the number of replicates, the environments evaluated, and the genetic variability of the population.…”

“…'Rubi Incaper 511' is an open-pollinated cultivar launched by the Capixaba Institute for Research, Technical Assistance and Rural Extension (Incaper) in 2010 (CATTANEO et al, 2010). In a study by Barros et al (2017), in which this cultivar was compared with eight other genetic materials, including hybrids, and the 'Rubi Incaper 511' had higher productivity, higher number of commercial fruits and fewer deformed fruits in the two harvests evaluated. However, the low soluble solids content of its fruits prevents its use on a commercial scale, which reinforces the need to continue the papaya breeding program developed by Incaper, which seeks to improve fruit quality of 'Rubi Incaper 511'.The objective of this study was to compare different selection index based on the phenotypic and genotypic values predicted by REML/ BLUP in a segregating population of the papaya cultivar Rubi Incaper 511.…”