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de Aragao F.A.S.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais | de Sousa Nunes G.H.,UFERSA | de Queiroz M.A.,UNEB
Crop Breeding and Applied Biotechnology | Year: 2015

Significant genotype vs. environment interaction (G x E) is expected as a result of geographical diversity and differences in management techniques in melon growing. Ninety-six F3 families from the cross between inodorus and conomon melons were evaluated in three environments for studying interaction. The G x E interaction, genetic parameters, and direct and indirect gains were estimated. Average weight of the fruit, pulp thickness, cavity thickness, pulp firmness, and soluble solids were evaluated. The simple part of the G x E interaction was always greater than 99%, except for pulp firmness, where there was predominance of the complex part. The coefficient of genetic variation and genetic variance were overestimated by the G x E interaction. The direct gains from selection were higher than the indirect, except when selection was made by the mean of the three environments. Genotype assessments in more than one location are necessary, but selection should be made by the mean values of families in the environments. © 2015, Brazilian Society of Plant Breeding. All rights reserved. Source

Albuquerque A.C.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais | De Castro A.C.R.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais | Aragao F.A.S.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais | Loges V.,University of Pernambuco | Morais E.B.,Federal University of Rio de Janeiro
Acta Horticulturae | Year: 2013

Anthurium plowmanii is a tropical plant that stands out due the beauty of its foliage and high postharvest durability. Despite being a native species with great aesthetic value, its cultivation is restricted and little is known about its potential of use and optimum harvest stage. The objective of this study was to evaluate the longevity of cut A. plowmanii leaves at three different maturity stages. The experimental design was completely randomized with 10 replicates. Three fully expanded leaves were harvested counting from the apex: first leaf (T1), second leaf (T2) and third leaf, the oldest one (T3). The following parameters were evaluated: leaf blade length and width and petiole diameter, leaf thickness and leaf weight. The leaves were kept in distilled water and their longevity in days after cutting (DAC) was observed weekly according to a score criteria. The T1 leaves had the longest postharvest life (21.2 DAC) until the first symptoms of senescence appeared, followed by T2 (9.6 DAC) and T3 (5.6 DAC), which lost their commercial value quickly. The symptoms of senescence in order of appearance was leaf yellowing at the margins followed by spots along or near the primary vein, internerval leaf yellowing and finally dryness and wrinkling of margins. Positive correlation was observed between T1 leaves longevity and both thickness and length of the limb. Therefore, younger leaves with greater thickness and length of the blade will have the longest postharvest life after cutting. Source

de Castro A.C.R.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais | Willadino L.G.,University of Pernambuco | Loges V.,University of Pernambuco | de Castro M.F.A.,University of Pernambuco | de Aragao F.A.S.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais
Revista Ciencia Agronomica | Year: 2015

The objective of this study was to characterize nutritional deficiencies in Heliconia psittacorum x Heliconia spathocircinata 'Golden Torch', through growth indicators, symptomatology and macronutrients contents in leaves and underground plant part. The experiment was carried out in a greenhouse, with eight treatments comprising complete nutrition solution (N, P, K, Ca, Mg, S), solution with individual nutrient omission of N, P, K, Ca, Mg or S and solution lacking all nutrients. The symptoms of nutrients deficiency appeared in the following occurrence order: N, K, P, Mg and S. Deficiency symptoms were: general chlorosis to - N omission; slight chlorosis to - P and - S; dark green leaves and necrosis to - K; marginal chlorosis and necrosis to - Mg. Calcium omission did not cause any visual symptom. Deficiencies in N and P affected more intensely shoot number, leaf dry mass production, total leaf number and leaf area. Among the evaluated leaves, there was a tendency of a highest decrease in the contents in the third leaf. Source

Aragao F.A.S.,Laboratorio Of Melhoramento E Recursos Geneticos Vegetais | Torres Filho J.,Rural University | Nunes G.H.S.,Rural University | Queiroz M.A.,Bahia State University | And 5 more authors.
Genetics and Molecular Research | Year: 2013

The genetic divergence of 38 melon accessions from traditional agriculture of the Brazilian Northeast and three commercial hybrids were evaluated using fruit descriptors and microsatellite markers. The melon germplasm belongs to the botanic varieties cantalupensis (19), momordica (7), conomon (4), and inodorus (3), and to eight genotypes that were identified only at the species level. The fruit descriptors evaluated were: number of fruits per plant (NPF), fruit mass (FM; kg), fruit longitudinal diameter (LD; cm), fruit transversal diameter (TD; cm), shape index based on the LD/TD ratio, flesh pulp thickness, cavity thickness (CT; cm), firmness fruit pulp (N), and soluble solids (SS; °Brix). The results showed high variability for all descriptors, especially for NPF, LD, and FM. The grouping analysis based on fruit descriptors produced eight groups without taxonomic criteria. The LD (22.52%), NPF (19.70%), CT (16.13%), and SS (9.57%) characteristics were the descriptors that contributed the most to genotype dissimilarity. The 17 simple sequence repeat polymorphic markers amplified 41 alleles with an average of 2.41 alleles and three genotypes per locus. Some markers presented a high frequency for the main allele. The genetic diversity ranged from 0.07 to 0.60, the observed heterozygosity had very low values, and the mean polymorphism information content was 0.32. Molecular genetic similarity analyses clustered the accessions in 13 groups, also not following taxonomic ranks. There was no association between morphoagronomic and molecular groupings. In conclusion, there was great variability among the accessions and among and within botanic groups. © FUNPEC-RP. Source

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