Efeito de diferentes concentrações do Ácido 3-Indol Butirico e Ácido Naftalenoacético na formação de raízes adventícias em estacas caulinares de warbugia salutaris (Bertol f. Chiov )Chibaha

Abstract

The present work was developed with the objective of evaluating the effect of different concentrations of two synthetic hormones, Naphthalene-Acetic Acid (ANA) and 3-Indol-Butyric Acid (AIB) on the vegetative propagation by stem cuttings of Warburgia salutaris (Bertol. F.) Chiov. The experimental design used was completely randomized, in a 4x2 factorial, with four different concentrations of AIB and ANA (0; 5000; 7500 and 10000 mg / L) and two rooting substrates (soil from Rio Incomáti and mixture from soil from Rio Incomáti and soil around the propagation greenhouse of the Department of Biological Sciences). The trial consisted of two experiments. In the first, the cuttings were immersed for three to five seconds in IBA and ANA solutions in the following concentrations: 5000 mg / L (0.5%), 7500 mg / L (0.75%) and 10000 mg / L (1 %) and then were placed for rooting in pots containing soil from the Incomáti River. The second consisted of immersing the cuttings in the same solutions and placing them in pots containing a mixture of soil from the Incomáti River and around the propagation greenhouse in the proportion of 1: 1, for rooting. After 120 days of the test, the results showed that under the conditions in which it occurred, the use of ANA and AIB in the concentrations already mentioned and the rooting substrates referred to does not promote the formation of adventitious roots in Warburgia salutaris stem cuttings. Stake survival in general was low. Treatments with 1% ANA in the first experiment and 0.75 and 1% ANA and 0.5% AIB in the second experiment showed 0% survival at the end of the trial. Although there was formation of shoots, the average did not exceed 1 unit in all treatments in both experiments. in general, a greater number of shoots and a higher percentage of survival were observed in the treatments with IBA in both experiments. The low number of shoots formed, the absence of root formation and the low survival, allow to conclude that Warburgia salutaris is a species of difficult propagation by the method presented here.