Francisco Augusto Alves Câmara

Crescimento de cultivares de Ipomoea batatas oriundas de rebentos produzidas de forma convencional e in vitro

This work had the objective of analyzing the growth and agronomic behavior of sweet potato cultivars originated from conventionally or in vitro produced sprouts. The experimental design was a 5×2 full factorial in randomized complete blocks with four replicates. The treatments were five sweet potato cultivars (‘ESAM 1’, ‘ESAM 2’, ‘ESAM 3’, ‘Branca do Rio de Janeiro’ e ‘Califórnia’) and two propagation methods (conventional and in vitro). For the growth analysis, plant were collected at 40, 60, 80, 100 and 120 days after planting, from which was measured the plant dry mass, the tuberous root dry mass, and the leaf area. The following physiological indexes were calculated: absolute and relative growth rates, leaf area index and net assimilatory rate. A significant interaction among cultivars, propagation forms and evaluation time for all variables was observed. The highest values were obtained for the plants originated from in vitro culture. Cultivar ‘ESAM 2’ exhibited a higher plant dry mass, absolute growth rate and tuberous roots dry mass.

Desempenho agronômico de cultivares de batata-doce oriundas de ramas produzidas de forma convencional e in vitro - DOI:10.5039/agraria.v8i3a2353

Este trabalho teve como objetivo avaliar o desempenho agronomico de cultivares de batata-doce [ Ipomoea batatas L. (Lam.)] oriundas de ramas produzidas de forma convencional e in vitro, nas condicoes edafoclimaticas de Mossoro-RN. O delineamento experimental utilizado foi o de blocos ao acaso, em esquema fatorial 5 x 2, com quatro repeticoes. Os tratamentos consistiram da combinacao de cinco cultivares de batata-doce (ESAM 1, ESAM 2, ESAM 3, Branca do Rio de Janeiro e California) e duas formas de propagacao (convencional e in vitro). As caracteristicas avaliadas foram: Produtividades total, comercial e nao-comercial de raizes; massa de raizes comerciais; numero de raizes comerciais e total por planta; massa seca da parte aerea, de raizes e total. A propagacao in vitro proporcionou, em todas as cultivares de batata-doce maior numero e produtividade de raizes comerciais, sendo a cultivar ESAM 1 a que apresentou os maiores ganhos percentuais. As cultivares California e ESAM 2 foram as mais produtivas, respectivamente na propagacao convencional e in vitro.

In vitro Germination of Anthurium affine Schott at Half-MS Strength

The Anthurium affine Schott is an aroid of ornamental and medicinal potential; however, its means of propagation are poorly known. The objective of this study was to evaluate in vitro germination of A. affine Schott in two MS (Murashige and Skoog) medium concentrations (100% and 50%) and under two light intensities (light and dark). The experiment was conducted using a 2 × 2 factorial in a completely randomized arrangement. The four treatments were: T1: 100% MS + dark; T2: 50% MS + dark; T3: 50% MS + light; and T4: 100% MS + light. Each treatment consisted of 30 test tubes (replicates). Seven days after setting up of the experiment, plastic cover was removed from the test tubes, and soon thereafter germination was assessed. Twenty-three days later, the number of leaves, plant height, number of roots, and size of the biggest root were recorded. There were no significant differences among the treatments for number of leaves. Mean plant height, the number of roots, and the size of the biggest root were affected by treatments, however, with Treatments 2 and 3 (50% MS) giving bigger values than Treatments 1 and 4 (100% MS). We concluded that the light treatmentdid not affect seed germination of A. affine and that the half-strength MS medium recorded a better plant development, with taller plants and larger and more roots.