Análise da calogênese de paricá por modelos de regressão logística

Abstract

In this study concerning the parica (Schizolobium amazonicum), it was aimed to evaluate the interaction among different explant sources and plant growth regulators concentration on callus induction, through the approach of generalized linear models. The explants were extracted from seedlings germinated in vitro. Apical, cotyledon, root and nodal segments were used for induction with 2,4-dichlorophenoxyacetic acid (2,4-D) from 0,0 to 2,1 mg L-1 and, was still tested hypocotyledonary segments for induction with indol-3-butyric acid (IBA) and 6-benzylaminopurine (BAP) combined from 0,0 to 1,0 mg L-1. It was used Woody Plant Medium (WPM) supplemented with 0,3% sucrose, 0,1% polyvinylpyrrolidone (PVP) and 0,6% agar. It was evaluated the callus percentage, the explant coverage percentage by callus and the ratio of dry mass by fresh mass. As a result, it was obtained 100% callus formation in that explants in contact with the lower concentrations applied, except for the root segments. It also reports that the higher chances of callus coverage were observed at the nodal explant, having been used 2,4-D, and the cotyledon explants, by using the IBA with BAP combination. The adjusted models selected proved itself a good inference alternative for allowing the evaluation and study of independent variables with distribution other than normal.