Revista Brasileira de Fruticultura

Matos Filho, Carlos Humberto Aires; Carvalho Júnior, José Eduardo Vasconcelos De; Lima, Maria Auxiliadora Coelho De; Lopes, Ângela Celis De Almeida; Gomes, Regina Lucia Ferreira; Lima Neto, Francisco Pinheiro; Abstract: The aim of this study was to estimate genetic parameters and select superior mango genotypes using the mixed-models approach. The 16 genotypes, varieties and hybrid selections, were evaluated regarding physical and physical-chemical traits of the fruit using the REML/BLUP methodology. Mango fruit weight and pulp weight can be selected indirectly based on fruit length and diameter, which are more easily evaluated. The hybrids CPAC 26394, Lita, and Rosa 46 stand out in regard to fruit size. The genotypes R12P09, CPAC 2293, Roxa, Omega, Alfa, and Lita have better quality fruit than the Tommy Atkins variety that is widely used in commercial orchards. The Roxa variety has pulp with little or no fiber, a trait that is of great importance to consumers and for industrial processing. The genotypes Alfa, CPAC 5895, Ômega, R10P08, R12P09, R13P10, Rosa 2, Rosa 36, and Rosa 46 have pulp free of internal breakdown. The varieties and hybrid selections of mango show variability regarding fruit traits, and the REML/BLUP methodology is efficient for selection of genotypes with desirable fruit traits in mango.

Navegantes, Patricia Cardoso Andrade; Lopes Filho, Wagner Romulo Lima; Rodrigues, Flávio Henrique Santos; Monteiro, Gabriel Gustavo Tavares Nunes; Chaves, Rosane Patrícia Ferreira; Oliveira Neto, Candido Ferreira; Cunha, Roberto Lisboa; Pinheiro, Hugo Alves; Abstract: Assai (Euterpe oleracea Mart.) cultivars BRS-Pará (BRS-PA) and BRS-Pai d’Égua (BRS-PDE) were selected for cultivation in upland regions of the Amazon. Given these cultivars were developed from different progenitors, we postulated that they differ regarding water-deficit tolerance. To test this hypothesis, plants of both cultivars were evaluated under well-watered (control) and water-deficit conditions (pre-dawn leaf water potential of – 2.33 MPa). Relative to control, the water-deficit decreased net CO2 assimilation rate (A) and transpiration by 82% and 86% in both cultivars, while the stomatal conductance (gs) was reduced by 93% and 87% in stressed plants of BRS-PDE and BRS-PA. The water-deficit improved instantaneous water-use efficiency by 43% in both cultivars, while intrinsic water-use efficiency (A/gs) increased by 193% and 33% in BRS-PDE and BRS-PA. The water-deficit induced 44% increase in foliar proline and 27% decrease in soluble carbohydrates in both cultivars, while foliar sucrose decreased by 53% in BRS-PA and 16% in BRS-PDE in relation to control. The relative water content in stressed plants of both cultivars was decreased by 8.5% in relation to control. In conclusion, the more efficient stomatal opening control and higher A/gs in BRS-PDE indicate this cultivar better copes with drought than BRS-PA.

Sobierajski, Graciela Da Rocha; Feldberg, Nelson Pires; Barros, Vera Lucia Nishijima Paes De; Blain, Gabriel Constantino; Bettiol Neto, José Emílio; Chagas, Edvan Alves; Abstract Traditional peach production regions provide adequate chill for satisfactorily bud’s flower break dormancy, in cultivars there developed. However, considering the expansion of the orchards in mild winter areas and the expected global trends to warmer conditions, the local development of cultivars became relevant. Based on this background, this study proposed to evaluate the performance of 33 peach and nectarine cultivars and selections in mild winter climate. Features associated to the vegetative development, phenology, productivity and fruit characteristics were measured in nine seasons, and the data analyzed by multivariate analysis of variance. Significant correlations between features were remarked. The Pillai and F tests presented significant results, highlighting significant differences among cultivars for almost all features. Peach and nectarine genotypes showed genetic diversity that may be accessed for use as cultivars, or parental for crosses. ‘IAC Aurora 1’, ‘IAC Aurora 2’, ‘IAC Centenário’, ‘IAC Douradão’, ‘IAC Jóia4’, ‘IAC Ouromel 3’, ‘IAC Régis’, ‘Diamante’, ‘Eldorado’, ‘FlordaPrince’, ‘Premier’ and ‘Tropic Beauty’ were the cultivars with the best results. A large number of selections showed promising results, emphasizing, the ‘IAC 680-177’, ‘IAC 1085-27’, ‘IAC 785-9’, ‘IAC 2982-31’, ‘IAC 4682-45’and ‘IAC 6882-84’.

Vidal-Lezama, Eloísa; Villegas-Monter, Ángel; Vaquera-Huerta, Humberto; Robledo-Paz, Alejandrina; Martínez-Palacios, Alejandro; Ferreira, Gisela; Abstract: Germination is influenced by several factors, among them pH. Two experiments were conducted to determine the effect of imbibition-water pH on the water absorption curve of chincuya seeds and germination. The results were contrasted to the known effect of gibberellic acid imbibition. In the first year of fruit collection and evaluation, imbibition curves were constructed per treatment. The seeds of this evaluation were divided into two lots: the first at the initial moisture content (39.9 %) and the second at the moisture content of 34.1 % after three days of drying in the laboratory. The seeds were imbibed for 84 h in distilled water at three pH levels (5, 7, and 9) and kept in a water bath at 30 °C. In the second year of collection and evaluation, the pH treatments were repeated, and an imbibition treatment with gibberellic acid at 350 mg L-1 (pH 3.9) was added. A control treatment contained distilled water at pH 6.1. For both years, treated seeds were incubated on paper towels and placed under controlled conditions at a 12-hour photoperiod and alternating day and night temperatures (30 °C:25 °C). The three imbibition curves showed similar behavior and no statistical significance. Seeds with a higher moisture content did not gain weight after imbibition. The imbibition curves increased constantly in the seeds at 34.1 % moisture, and weight gain reached almost 46 % with the pH 9 treatment. However, there were no statistical differences among treatments. The highest rate of water absorption occurred in the first six hours in the open-air, dehydrated seeds, and after 72 hours, the weight of the seeds did not increase. Average daily germination kinetics indicated a slow and poor germination process. Gibberellic acid significantly promoted germination, causing 43 % germination. The absolute control reached 5.7 %, while the rest of the treatments did not promote germination.

Nunes, Thaís Paula Martins; Matias, Sammy Sidney Rocha; Pereira, Gustavo Alves; Matos, Alex Pinto De; Silva Júnior, Gabriel Barbosa Da; Barroso, Priscila Alves; Abstract: Plant and fruit quality is a reflection of several factors, one of which is the way the seedlings were produced. The aim of this study was to analyse the phytotechnical and nutritional characteristics of fig tree seedlings (Ficus carica L.) produced in a substrate comprising decomposed stems of the buriti palm (Mauritia flexuosa L.). A randomised block design was used, with treatments distributed in a 5x6 factorial scheme with one additional treatment, arranged in five blocks. The substrates included the following levels of decomposed buriti stems: 20%, 40%, 60%, 80% and 100%, with a different decomposition time (0; 15; 30; 45; 60 and 75 days) for each treatment. There was one additional treatment comprising 100% soil. The following variables were evaluated to determine the effects of the treatments: number of leaves (NL), number of branches (NB), leaf chlorophyll index, diameter of the largest shoot (DLS), length of the largest shoot (LLS), leaf area (LA), root length (RL), root volume (RV), shoot fresh matter (SFM), root fresh matter (RFM), shoot dry matter (SDM) and root dry matter (RDM), with a chemical analysis of the shoots and soil before and after setting up the experiment. The proportion of decomposed buriti palm stem in the substrate yielded significant results for the morphological variables, including the number of leaves, shoot fresh matter, root fresh matter and root volume. For the nutritional variables relating to the aerial part of the seedlings, the proportion of substrate yielded significant results for the levels of calcium, magnesium, iron and zinc. There were no significant results from the decomposition time; however, multivariate analysis showed that by the end of the experiment the nutrient concentration in the soil was higher than before the experiment.