Qualidade de luz na micropropagação de mirtileiro ‘Woodard’

Abstract

The objective of this study was to verify the influence of the 2-Isopentenyladenine (2ip) and indolbutyric acid (IBA) phytorregulators, allied to the light quality, in the in vitro multiplication and rooting of the Woodard myrtle. The experiments were carried out from May to November of 2016. In the Laboratory of Micropropagation of Fruit Plants, from the Department of Phytotechnology of the Faculty of Agronomy Eliseu Maciel (FAEM), and some evaluations were carried out in the Laboratory of Plant Metabolism, botanical department of the Institute of Biology, Federal University of Pelotas (UFPel), in Capão do Leão, RS. Variables related to survival percentage, shoot number, shoot length (cm), shoot length (cm), number of leaves (gems), multiplication rate (absolute numbers), leaf area of roots, rooting percentage (%) and length of the largest root (cm). The results obtained demonstrate that the presence of 2ip associated with white fluorescent light gives better results to shoot length of the explants, besides providing a greater number of leaves and shoots. With regard to chlorophyll and carotenoids, it is observed that the highest values occurred in the absence of the phytoregulator. The highest indexes of leaf area could be verified in the presence of white fluorescent light. In the presence of IBA a greater number of shoots were observed when using the blue light filter and the fluorescent lamp. However, for the number of leaves and roots, percentage of rooting and leaf area were obtained higher averages in the condition of white fluorescent light. Carotenoids had superior results on the blue and red filters. The variables length of the highest sprouting (cm), length of the largest root (cm), number of roots and growth rate (%) presented higher averages in the presence of IBA. The presence of 2-Isopentenyladenine (2ip) as well as the presence of Indolbutyric Acid (IBA) associated with fluorescent white light results in better multiplication and in vitro rooting of Woody Goldfish, respectively.