Morfofisiologia e anatomia foliar de mudas micropropagadas e aclimatizadas de abacaxizeiro cv. Smooth Cayenne em diferentes substratos

Abstract

This study aimed to determine the optimal substrate and ideal time for acclimatization in plants of the 'Smooth Cayenne' pineapple and compare anatomically plantlets cultivated in vitro with acclimatized plants. Shoots were inoculated on MS with BAP (6.66 µM). After three subcultures, the buds were transferred to MS medium for 30 days. The media were solidified with 0.7% agar, and the pH adjusted to 5.8 before autoclaving (120ºC for 20 minutes). Cultures were kept in a growth room (25±1ºC, irradiance of 35 μmol m-2 s-1 and 16 hours photoperiod). The shoots obtained in vitro were transplanted into plastic pots in a greenhouse, containing the following substrates: T1- Plantmax® + húmus (P + H), T2-Plantmax® + vermiculite (P + V) and T3-Plantmax® (P). Anatomical cuts were made on leaves of plants maintained in vitro and plants with 20, 40 and 60 days of acclimatization on different substrates. The use of Plantmax® + húmus substrate provided greater development in the acclimatization of plants. From 40 days of acclimatization, the plants showed anatomical features that may facilitate the adaptation to field conditions.