Extrato da macroalga parda Ascophyllum nodosum no cultivo e conservação in vitro de plantas ornamentais da Chapada Diamantina- Ba

Abstract

The biostimulants based on seaweed are widely used in plant cultivation and the brown seaweed extract Ascophyllum nodosum (ANE) and is most used in the international agricultural trade because it has several benefits for plants. ANE is indicated as an optimizer of in vitro cultivation, this being the first report of its application in ornamental plants from Chapada Diamantina-BA, which need studies to promote their propagation and conservation. In this way, this study it has as objective to evaluate the efficiency of the extract of A. nodosum in the multiplication and conservation in vitro of Cattleya elongata and in the propagation in vitro of Comanthera mucugensis and Vellozia harleyi, species present in the Chapada Diamantina, with importance for the ornamental market and in the vegetation profiles composition of the region. For the analysis of the conservation and multiplication of C. elongata had been used five concentrations of the extract during 320 days of cultivation, being evidenced a significant increase of 12x in the number of responsive explantes shoots and 100% responsive explants for budding. For the cultivation of C. mucugensis and V. harleyi had been used four concentrations of the extract per 120 days, getting itself increase of 27% survival of C. mucugensis and promotion of the minimum growth, as well as significant increase of the number of roots and length to root of V. harleyi. Therefore, the extract of A. nodosum is indicated for conservation of C. elongata and has potential use in the conservation of C. mucugensis and in rooting in vitro of V. harleyi.