Silício na biometria de mudas de abacaxizeiro var. erectfolius

Abstract

In vitro micropropagation is a plant tissue culture tool, which has been used for the development of seedlings with the possibility of adding more quality to plant material from the use of new compositions in culture media. Silicon is a chemical element for plants, observed in recent years, due to its effects on the development of different species, as well as its applications in a combination of culture medium in the micropapagation of plants. Therefore, in this work, the effects of using different concentrations of silicic acid as a source of silicon on the in vitro development of Ananas comosus var. erectifolius. For this, sectioned shoots of seedlings in the pineapple multiplication phase were used, which were achieved in vitro in glass flasks with 60 mL of Murashige & Skoog (MS) culture medium. The experimental design was completely randomized and the veterinary treatments by a control and four concentrations of silicic acid (H4SiO4) in the culture medium (0; 0.5; 1.0; 1.5; and 2.0 g L-1) , with 15 repetitions (2 segments/flask). At 28 and 35 days, the biometric characteristics were evaluated: shoot length (cm), number of leaves, shoots and roots. In the last evaluation, fresh mass and total dry mass (g), rosette diameter and width of the 3rd leaf were also analyzed. There was a significant effect for the variable number of shoots at 28 and 35 days. For the other variables, there was no significant difference. The addition of silicic acid promoted improvements in all biometric characteristics evaluated, when compared to the treatment in which there was no addition of silicic acid in the in vitro culture of Ananas comosus var. erectifolius.