Soluções de pré-condicionamento no crescimento ex vitro de Dendrobium bigibbum Lindl. (Orchidaceae)

Abstract

Denphal is a hybrid species, adaptive to all types of climates, being used both in potted plants and in cut flowers. This study aimed to evaluate the ex vitro growth of Denphal plants under different concentrations of ascorbic, salicylic and citric acid (1mM, 2mM, 3mM). Six months after aclimatization, the plants were evaluated for percentage of increase in the number of leaves, seedling height, diameter of the largest pseubobulb, number of shoots, number of roots, length of the largest root, length of the largest leaf and fresh mass. The experimental design was completely randomized and the treatments were arranged in ten treatments with 11 replications of one plant each, being a total of 122 plants. The imbibition of Denphal roots in distilled water and cultivation in a container equipped with a lid with a hole, allowing gas exchange, remaining covered for the first 15 days of the experimental period (control) provided the best results in ex vitro growth. Ascorbic acid promoted hardening of the root system of Denphal seedlings, which may be a viable technology in the ex vitro cultivation of this plant, requiring further studies with other concentrations.