Germinação e estabelecimento inicial in vitro de Lavandula angustifolia

Abstract

The plant tissue culture techniques includes a set in which each explant (cell, tissue or organ) is isolated under aseptic conditions on artificial nutrient medium. This process is based on the principle of totipotentiality cells, or any plant organism cell has all the genetic information necessary for the regeneration of a whole plant. Nevertheless, some plant species have difficulty germination is the case of Lavandula angustifolia, and an unevenness in the development of seedlings and plants in the field, due to natural variability resulting from sexual propagation. In this context, the in vitro culture can solve or minimize hot spots in seedling establishment with medicinal properties and production of essential oils or by micropropagation. Thus, three experiments were carried out in order to study the germination and early development of this species. In the first experiment evaluated the efficiency of use of hydrogen peroxide in the pretreatment of seed treated with different concentrations of gibberellic acid in vitro culture: 0.0; 1.0; 2.0 and 3.5 mg L-1. Then, we assessed the influence of using conventional lamps and growlux MS and LS media at concentrations of 50 and 100% of the salts. Finally, an assay which evaluated the effect of the new class of regulators comprising polyamines putrescine, spermine and spermidine concentrations in different under conventional lamps. In all experiments biometric characteristics such as number of leaves were evaluated, shoot length and root fresh weight, percentage of abnormal seedlings, survival rate and the kind of germination parameters such as germination, emergence rate, start time, end and average germination, sync, uncertainty. Best results were found when retracted the seeds with hydrogen peroxide and inoculated in medium containing 2.5 mg L -1 of gibberellic acid. The use of growlux lamps did not differ across conventional light bulbs in the evaluated characteristics, but it was identified that the species grows best in LS means . As for the polyamines found a generally favoring the germination, shoot and leaf number of lavender seedlings at 0.5 mg L-1 spermine. except when applied spermine generating fewer sheet in this condition.