Variation in rooting behavior of stem cuttings in relation to their origin in Taxus
wallichiana Zucc. |
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| Authors: | Kiran Kaul |
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| Institution: | (1) RRL Extension Centre, Palampur, Himachal Pradesh, India;(2) Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India |
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| Abstract: | The present study investigates optimal conditions for the vegetative propagation of Himalayan yew Taxus wallichiana Zucc., an important medicinal tree, during spring. Effect of four treatments: (a) sex of donor plant (male and female), (b)
age/type of shoot (1, 2, 3 year old, long and dwarf shoots), (c) auxin treatment (IBA and NAA at 0, 0.5, 1.25, 5.0 & 50.0 mM)
and (d) rooting environment (raised beds/polythene bags) on percentage rooting in stem cuttings was studied. Randomized complete
block (RBD) designs were used for experimentation. Rooting ability of cuttings was significantly influenced by all these treatments.
The overall rooting response was higher in long shoot cuttings taken from female tree. Age of shoot also influenced the rooting
response and was highest in 1 year old long shoot cuttings of female tree. Exogenous application of auxin, α-naphthalene acetic
acid (NAA) and indole-3 butyric acid (IBA), had significant positive effect on the percentage rooting. IBA significantly enhanced
the rooting percentage in 1 year old long and dwarf shoots at lower doses and 2 and 3 year old long shoots from female tree
at higher doses. Maximum percent rooting (90% ± 2.8) was obtained with interactive effect of 0.5 mM, NAA (22 h) × 1 year old
long shoot from female tree; followed by the interactive effect of 50 mM IBA (5 s) × 3 year old long shoot from female tree
(83% ± 4.1). Cuttings planted in soil: sand medium in polythene bags showed earlier rooting response (12 weeks) than cuttings
planted in raised nursery beds (24 weeks). Overall, the findings of this study suggest that 0.5 mM IBA treatment is suitable
for enhancing adventitious rooting in 1 year old long and dwarf shoots of male and female trees. IBA at higher doses is suitable
for enhancing the rooting percentage of 2 and 3 year old long shoots from female tree. This study provides a significant lead
towards the development of a simple and inexpensive technique for large scale propagation, aforestation of elite genotypes
and raising of bush type plantation under ex-situ conditions. |
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| Keywords: | Himalayan yew Cuttings Male tree Female tree Long shoots Dwarf shoots IBA NAA Propagation |
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