Crescimento de mudas micropropagadas de bananeira aclimatizadas nas condi??es da Amaz?nia Sul Ocidental sob a influência de diferentes substratos e recipientes

摘要

For laboratories that produce thousands of micropropagated plants regularly, the optimization of the acclimatization phase is of fundamental importance to avoid excessive losses and to promote the development of the plants. The aim of this work was to evaluate the growth of micropropagated banana plantlets during the acclimatization under the influence of different substrates and recipients on conditions of South West Amazon. Shoots of banana, cv. Grand Naine, were rooted in MS medium, being the rooting plants transferred to a nursery, in two types of plastic dibble tubes (115 cm3 and 180 cm3) and six different substrates formulated from different portions of soil, carbonized rice hulls and bovine manure. Evaluations of plant survival, height of the aerial part and pseudostem diameter were carried out each fifteen days, and at the end of 75 days, fresh and dry mass for the roots and aerial parts of the plants were also determined. It was verified that the plant survival was not influenced by the use of the 115 cm3 or 180 cm3 plastic dibble tubes. However, acclimatization accomplished in the 180 cm3 plastic dibble tubes provided larger growth in height and pseudostem diameter of the plants and, consequently, larger accumulation of fresh and dry mass of roots and aerial parts, when compared to the 115 cm3 plastic dibble tubes. Among the substrates, it was observed that bovine manure was fundamental as substrate component to obtain the best results.