Effect of different growth regulators on rooting of stem cutting in Bougainvillea
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Date
2016
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Punjab Agricultural University, Ludhiana
Abstract
The present investigations entitled “Effect of different growth regulators on rooting of stem
cuttings in Bougainvillea” were undertaken at research farm of Department of Floriculture
and Landscaping, Punjab Agricultural University, Ludhiana in difficult to root Bougainvillea
varieties viz. Shubra, Lady Mary Baring and Zakiriana during 2015-16. In all the three
varieties, stem cuttings were treated with different growth regulator concentrations and
combinations for long duration (12h) and quick dip (<5 sec) and planted in the polybags
containing garden soil. In the cuttings treated for quick dip (<5sec), IBA 2000 ppm resulted in
maximum mean number of shoots (1.64), mean shoot length (7.07 cm), mean number of
leaves (24.91), mean number of branches (2.17) and mean number of roots (3.75) of cuttings
among all the growth regulator treatments. The treatment with NAA 2000 ppm resulted in
maximum mean shoot emergence (35.56%) and establishment of plants (32.22%), however,
treatment with NAA+IBA (100+500) ppm resulted in maximum mean root length (10.50 cm).
Among all the three varieties, Zakiriana was the best with maximum shoot emergence
(35.00%), number of shoots(1.30), average shoot length (5.10 cm), number of leaves (25.02),
number of branches (1.30), number of roots (2.49), average length of roots (9.04 cm) and
establishment of plants (32.33%). In the cuttings treated for long duration (12h), NAA+IBA
(100+100) ppm resulted in maximum mean shoot emergence (40.00%) among all the growth
regulator treatments. The treatment with IBA 500 ppm resulted in the maximum mean
number of shoots (1.86), mean shoot length (7.11 cm), number of branches (1.84), number of
roots (3.07). The treatment with NAA 500 ppm resulted in maximum mean number of
branches (1.84), however, treatment with NAA+IBA (50+100) ppm resulted in the maximum
mean number of leaves (28.81). The maximum mean per cent establishment (35.56%) of plants was observed in treatment with NAA+IBA (100+50) ppm. Among all the three
varieties, Zakiriana was the best with maximum shoot emergence (44.33%), number of
shoots(1.69), average shoot length (6.12 cm), number of leaves (30.80), number of branches
(1.72), number of roots (2.64), average length of roots (13.25 cm) and establishment of plants
(39.67%).