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    Repeatability and correlations among peach physical traits
    (Crop Breeding and Applied Biotechnology, 2004) Albuquerque, Alejandra Semiramis; Bruckner, Claudio Horst; Cruz, Cosme Damião; Salomão, Luiz Carlos Chamhum; Neves, Júlio César Lima
    Selection fields of fruit crops are commonly installed without statistical design. This impairs the acquisition of trustworthy information and genetic parameters such as heritability. The coefficient of repeatability can be used to guide the selection since it defines the superior limit of heritability and can be estimated without much experimental sophistication. The coefficient of repeatability of fruit characters of peaches was estimated. It was verified that the selection based on samples of nine fruits leads to the accuracy of 0.90 in the evaluations of the permanent phenotypic values, indicating the efficiency of mass selection for length, diameter, and weight of the fruit, weight of the pit, firmness of the pulp and the pulp/pit and length/diameter ratios of the fruit. The coefficients of correlation indicate that the fruit physical traits can be improved by selecting for fruit diameter (highly correlated with fruit weight), low ratio L/D, and high ratio pulp/pit.
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    Production and quality of sweet grape tomato in response to foliar calcium fertilization
    (Revista Ceres, 2022) Melo, Raphael Oliveira de; Prieto Martinez, Herminia Emilia; Rocha, Brunno César Pereira; Garcia Júnior, Edimaldo
    In tomato, foliar application of calcium-based nutrient solutions is used to complement soil fertilization. However, knowledge regarding the factors that influence the effectiveness of foliar fertilizer applications remains incomplete. The objective of this study was to evaluate the efficiency of foliar fertilization with calcium for improving production and quality of hydroponic Sweet Grape tomatoes. An experiment was conducted in a commercial hydroponic system in a split-split-plot scheme, with two calcium doses: 1,5 and 3 mmol L-1 of Ca. The solutions were sprayed on the leaves at intervals of 7 and 14 days, using commercial foliar fertilizers containing 0.3 g L-1 of calcium chloride or calcium acetate. The results indicate that the foliar application of calcium fertilizers, regardless of the amount of calcium provided in the nutrient solution and the frequency of applications, positively affects fruit production and quality. No difference was found between the effects of application of the two calcium sources, as well as the frequency of application.
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    Allometric models for estimating the leaf area of lisianthus (Eustoma grandiflorum) using a non-destructive method
    (Revista Ceres, 2022) Dias, Marlon Gomes; Silva, Toshik Iarley da; Ribeiro, João Everthon da Silva; Grossi, José Antônio Saraiva; Barbosa, José Geraldo
    Lisianthus (Eustoma grandiflorum) is a cut flower grown due to the wide diversity of colors and longevity in the post-harvest. The leaf area measurement is fundamental in plants because the leaves are directly related to several processes such as transpiration, radiation interception and CO2 fixation that enable the plant to grow. The objective of the work was to determine an allometric equation for estimating the leaf area of lisianthus from linear dimensions. 200 leaves were collected and the leaf length (L), leaf width (W), product between length and width (LW) and real leaf area (LA) were measured. The criteria for determining the best model were the highest determination coefficient (R2), Willmott’s concordance index (d), lowest Akaike information criterion (AIC), root mean square error (RMSE) and BIAS index closest to zero. The most suitable model for estimating the leaf area of lisianthus is the linear w = 1.387*LW.
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    Use of methyl jasmonate in bird of paradise
    (Revista Ceres, 2021) Pereira, Ariana Mota; Gomes, Mateus de Paula; Gonçalves, Dreice Nascimento; Guimarães, Maria Eduarda da Silva; Freire, Ana Izabella; Finger, Fernando Luiz
    The MeJA has been shown to be promising in reducing the damages caused by cold and maintaining the quality in several products. Nevertheless, few studies are conducted with flowers and there are no studies of its use in bird of paradise. The objective of this study was to determine whether the pulsing application with MeJA submitted to cold storage promotes physiological changes of the bird of paradise. Flowers were placed in solutions of 200 g L-1 sucrose added with 100, 250 and 400 µmol L-1 MeJA and control without MeJA for 24 h. The stems were transferred to containers with water at 5 ºC for 28 days. During storage, the water uptake rate, transpiration and fresh mass were reduced, while the electrolyte leakage and phenolic compounds increased. The application of MeJA did not reduce the loss of fresh mass and electrolyte leakage. The application of 400 µmol L-1 MeJA has increased peroxidase activity since day 14 of storage. It is concluded that the application of MeJA with pulsing under refrigeration does not promote positive physiological changes for the maintenance of the quality in bird of paradise flowers.
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    Mathematical modeling of whey foam mat drying
    (Revista Ceres, 2021) Baptestini, Fernanda Machado; Corrêa, Paulo Cesar; Zeymer, Juliana Soares; Leite, Rildo Araújo Leite; Bustos-Vanegas, Jaime Daniel; Baptestini, Gheila Corrêa Ferres
    This study aimed to fit mathematical models to whey foam drying processes in different air temperature conditions, to determine the effective diffusion coefficient and to obtain the activation energy. For foam formation, 5.0% Emustab® was added to the serum in mass and subjected to stirring in a domestic shaker for 15 min. After, it was spread onto trays to form a thin layer of about 1 cm in which the drying conditions were: 40, 45, 50, 55 and 60 °C, 5.6 m s-1 and 60%. The Logarithm and Midilli models describe the kinetics of serum foam drying; the effective diffusion coefficient increased with the elevation of drying temperature and activation energy of 50.84 kJ mol-1.