Profundidade de plantio e dominância apical na estaquia de pitaia vermelha

Abstract

ResumoO trabalho foi conduzido com o objetivo de avaliar os efeitos da profundidade de plantio e da quebra de dominância apical na estaquia de pitaia vermelha Hylocereus undatus (Haw.) Britton & Rose. O experimento foi instalado no delineamento em blocos casualizados, com quatro repetições no esquema fatorial 2x3, sendo dois tipos de estacas (com e sem dominância apical), estacas não seccionadas e seccionadas a 5 cm da porção superior, e três profundidades de plantio (1,0; 5,0; 10,0 cm) e cada parcela foi constituída de dez estacas com 20 cm de comprimento. Após 60 dias do plantio, foram iniciadas as avaliações semanais do número de brotações e aos 90 dias após o plantio foram avaliados sobrevivência, enraizamento, número e comprimento de brotações, massa seca das brotações, e massa seca das raízes. Os dados foram submetidos à análise de variância e à regressão polinomial a 5% de significância. O percentual de enraizamento e a sobrevivência das estacas usadas no experimento foi 100% em todos os tratamentos. Com o aumento da profundidade de plantio foi observado redução linear em: número de brotações, massa seca da parte aérea e a massa seca da raiz. Os cladódios com dominância apical obtiveram comprimento de brotações superior. O plantio de estacas de pitaia vermelha na profundidade de 1 cm e com dominância apical é mais satisfatório para a produção de mudas. Palavras-chave: Hylocereus undatus, produção de mudas, propagação vegetativa AbstractThis study was conducted to evaluate the effects of planting depth and breaking apical dominance on cutting of red pitaya Hylocereus undatus (Haw.) Britton & Rose. The experiment was conducted in a randomized block design with four replications in a 2x3 factorial, with two kinds of cuttings (with or without apical dominance), cutting not sectioned and sectioned at 5 cm from the upper portion, and three planting depths (1.0, 5.0, and 10.0 cm) and each plot consisted of ten 20 cm long cuttings. After 60 days of planting, counts of the number of shoots were began weekly and 90 days after planting survival rooting, number and length of shoots, dry weight of shoots and root dry mass were evaluated. Data were subjected to analysis of variance and polynomial regression at 5% significance level. The percentage of rooting and the survival were 100% in all treatments. With increasing depth of planting it was observed linear reduction in numbers of shoots, dry weight of shoot and root dry mass. The cladodes with apical dominance had longer shoots. The planting of red pitaya cuttings at 1 cm of planting depth with apical dominance is more suited to the production of nursery plants.

Shading of Stock Plants and the Use of Auxin in Cutting Red Pitaya

“…Rooting and survival for all treatments was 100%, similar to the results obtained by Bastos et al (2006), Marques et al (2011Marques et al ( , 2012 and Pontes Filho et al 2014, for H. undatus cuttings grown in polyethylene bags under lath and greenhouse.…”

Shading of stock plants and the use of auxin in red pitaya cuttings

“…These observations corroborate those of Hartmann and Kester (1990), who noted that blanching may favor the action of auxin, and therefore, enhance rooting. Rooting and survival for all treatments was 100%, similar to the results obtained by Bastos et al (2006), Marques et al (2011Marques et al ( , 2012 and Pontes Filho et al 2014, for H. undatus cuttings grown in polyethylene bags under lath and greenhouse.…”

Effects of gibberellic acid concentration and fruit maturation stage on seed germination and vigor of pitahaya seedlings

“…Experiments were conducted at the Laboratório de Sementes do Departamento de Fitotecnia, Tecnologia de Alimentos e Sócio-Economia da Faculdade de Engenharia de Ilha Solteira-FEIS/UNESP and were divided into two stages based on the maturation stage of fruits from which seeds were extracted for the performance of tests. Ripe pitahaya fruits were purchased from a local market, standardized visually according to their color and consistency, and senescent fruits maintained at 10 °C in Biochemical Oxygen Demand incubators for three months after the previous stage, when they exhibited visible signs of deterioration (Marques et al, 2011).…”

“…Hunt) is a species belonging to the Cactaceae family and is native to tropical and subtropical America. The species is considered a promising fruit crop for cultivation owing to the increased consumption of exotic fruits, commercial value, rusticity, and medicinal properties (Marques et al, 2011).…”