Plant cutting is a widely used propagation method for olive trees. Its viability depends on the capacity for the adventitious root formation of each species. Nevertheless, it is necessary to study the different characteristics of this process. The purpose of this study was to evaluate the influence of substrates on the rooting of semi hardwood stem cuttings of ten olive tree cultivars. Middle sized branches were collected from mother plants located in the Germplasm Bank of EPAMIG in Maria da Fé, MG, Brazil, and cuttings were prepared of approximately 12 cm in length, with 4-6 internodes, maintaining four leaves in the apical region. A completely randomized experimental design was used, with tree replications and 20 cuttings per plot. The experiment was conducted in greenhouses, in rooting plant beds containing a perlite and sand substrate with controlled intermittent water mist. After installation of the experiment, treatment was carried out with copper oxychloride solution at 3% to prevent possible fungus attacks. Evaluations were performed 70 days after cutting of the varieties. There was variation in rooting of olive tree cultivar cuttings. Better performance of sand was observed in the production of cuttings of olive tree cultivars Alto D'Ouro, JB1 and Galega which were also the cultivars that stood out among the genotypes studied.
Acerola fruit is one of the richest natural sources of ascorbic acid ever known. As a consequence, acerola fruit and its products are demanded worldwide for the production of health supplements and for the development of functional products. Acerola phenotypes (103) were selected from Western Paraná State and evaluated to obtain information on fruit quality characteristics with the aim of using them in genetic breeding programs for improving acerola in the subtropical region of Brazil. Multivariate analysis of the dissimilarity among the phenotypes was performed using the heat map clustering method and principal component analysis. Results obtained using the two methods were comparable, and the methods were effective in discriminating between samples and variables. This indicates variability among phenotypes with potential for its use in breeding programs. Based on the mean values of the chemical and physical characteristics of fruits and considering the differences among the phenotypes, nine crosses are suggested to generate a future improved population, namely between phenotype numbers 37, 4, 14, 29 and phenotype numbers 99, 60 and 66, belonging to the two different clusters and characterized by high vitamin C content and yield or higher values of fruit size and color parameters.
Girdling consists of elimination of a small part of the cortex around a pre-selected branch, this technique being successfully applied in fruit trees. The aim of this study was to assess the effect of girdling period and types on branches of olive cultivars on their vegetative development and fructification. The study was conducted at the Epamig Experimental Farm, located in the municipality of Maria da Fé, MG, Brazil. Activities began in March 2012, with use of 7-year-old plants of the Ascolano 315, Grappolo 541 and Maria da Fé cultivars. Three periods were assessed (March, April and May/12) and two types of girdling (10 and 15 mm), plus the control (without girdling). A randomized block experimental design was used with a split plot, three replications and one plant per plot. After girdling, the branches of the plants were assessed, with mean branch length (m), branch diameter near the girdle (mm), diameter of the branch base (mm) and fruit harvest (kg) as variables. It was concluded that the girdling technique did not affect the length and diameter of the branches of the three cultivars. Superior results were found in olive tree branches girdling in March and May. The fruits collected were positively affected by girdling of the branches.
O Genótipo CCR5Δ32 em pacientes infectados pelo HIV candidatos à transplante de medula The CCR5Δ32 Genotype in HIV-infected patients who are candidates for bone marrow transplantation
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