Biotechnology tools based on tissue culture techniques allow mass clonal propagation of plants with
desired genetic and sanitary features. In the present work a pineapple micropropagation protocol was
establishedbasedonnodule cluster cultures (NC) associated withdifferent culture systems. Leaf segments
from in vitro-grown plantlets cultivated in culture medium supplemented with 2 M NAA and 8 M
2-iP or BAP resulted in the highest rates of NC induction. NC fresh weight increased ratio was more
efficient in a culture medium supplemented with 2 M NAA and 2 M BAP in twin-flasks temporary
immersion system (TIS-TF). This culture medium was also efficient for the microshoots development
in RITA® temporary immersion system (TIS-RITA®). Microshoots elongation in permanent immersion
system (PIS) was more efficient in a culture medium supplemented with 10 M GA3. Shoots longer than
2 cm showed 92% survival rate when acclimatized. Free polyamine endogenous levels was measured and
showed higher contents for the TIS-TF, followed by TIS-RITA®, and PIS, respectively. Putrescine levels also
followed this pattern, being absentin PIS, which, on the other hand, showed higher levels of spermine and
spermidine. The results indicate the establishment of efficient protocol for pineapple micropropagation,
with a high multiplication and regenerative rates and great potential for agriculture application. The
biochemical analysis suggests that besides culture medium composition, flask design and culture system
also drastically affects the plant’s metabolism toward multiplication and plant regeneration.
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