Substratos e concentrações de AIB na estaquia foliar de Rosa-de-Pedra (Echeveria elegans Rose)

Abstract

The objective of this work was to evaluate the morphophysiological responses of the root system of leaf cuttings Echeveria elegans Rose propagated under different substrates and concentrations of indolbutyric acid (AIB). The work was developed in the experimental area of Jardinocultura of the Faculty of Agricultural Sciences (FCA), of the Federal University of Grande Dourados (UFGD), in Dourados-MS, from November 2019 to January 2020. As material propagated by the cutting method Echeveria elegans spaths were used. The experimental design was completely randomized and the treatments were arranged in a 3 x 3 factorial scheme (three substrates and three concentrations of IBA), with ten repetitions of one spat each. These were immersed in distilled water (0) or in IBA (1,000 or 2,000 mg L-1), for five minutes. Then, planting was carried out on the following substrates: coarse-grained sand; commercial substrate (Carolina®) and sand + vermiculite + coconut powder. At 60 days after planting, the plants were evaluated for variables: percentage of survival, length of the largest root (CMR), diameter of the root system (DR), fresh root mass (MFR), fresh leaf mass (MFF), sheet width (LF), leaf thickness (EF) and leaf length (CF). The auxin x substrate interaction was significant for the parameters MFR, MFF, LF and CF. The substrate factor alone influenced the CMR and the DR, while the auxin factor when isolated, did not show significant effect for any evaluated characteristic. The commercial substrate influenced the CMR and while the sand substrate provided greater DR, and both substrates provided higher MFR values, with no significant effect from the use of AIB. It is concluded that the commercial substrate can be recommended for cutting Echeveria elegans Rose and treatment with indolbutyric acid did not provide the development of the root system of Echeveria elegans Rose.