Abstract:
The present study was undertaken in Biotechnology Laboratory of the Department of
Biotechnology, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka
1207 during the period from January. 2014 to December. 2014 to evaluate the effect
of different plant growth regulators on callus induction, shoot proliferation, root
formation and to develop micropropagation protocol of pineapple. Crown tip of
pineapple fruits were used as explants and inoculated in MS media supplemented with
different cone. of Benzyl adenine (BA), Kinetine (KIN). Indolebutyric acid (IBA).
Naphthaleneaeetie acid (NAA) alone or in combination with each other. The treatment 3.0 mgIL KIN + 2.5 mg/L NAA showed the highest percentage (800/0) of
callus induction. But minimum days (21.20) to callus induction and maximum weight
of callus (2.80 gm) was observed with 2.0 mg/L KIN + 1.5 mg/L NAA treatment. The
highest 85% shoot induction was obtained with 3.0 mgfL KIN +1.0 mg/L NAA
treatment and minimum 7.60 days was recorded with the same treatment. The highest
number of shoots (18.40) after 6 weeks of subculture was recorded in 3.0 mg/L KIN
+ 1.0 mg/L IBA and the longest shoot (9.04 cm) was found with 3.0 mg/L KIN+2.0 mg/L IBA. The treatment 2.0 mg/L IBA+ 1.5 mg/L NAA showed the highest
percentage (75%) of root induction, minimum 16 days to root induction and the
longest root (7 cm). But the highest number of roots (15.60) per explants was
recorded with 3.0 mg/L IBA+ 1.0 mg/L NAA after 6 weeks of subculture to rooting
media. Regenerated plantlets showed, 85% survival in growth chamber conditions and
82% in shade house stage of hardening with Sand : Soil : Cow-dung (1:1:1) and 78 %
in open atmosphere at direct sunlight.
