Variation in Shoot Anatomy and Rooting Behaviour of Stem Cuttings in Relation to Age of Donor Plants in Teak (Tectona grandis Linn. f.) |
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Authors: | Azamal Husen Mohinder Pal |
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Institution: | (1) Present address: Plant Physiology, Botany Division, Forest Research Institute, P.O. New Forest, 248006 Dehra-Dun, India;(2) Department of Applied biology, Faculty of Applied Science, University of Gondar, P.O. Box 196, Gondar, Ethiopia |
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Abstract: | Shoot anatomical features viz., number of vessel elements, width and length of vessel and fibre elements were studied in relation
to juvenility/maturity of teak (Tectona grandis Linn. f.). The findings show significant differences in these features, which indicates that variation in shoot anatomy can
be used as a reliable indicator of juvenility/maturity in teak. The effect of age of donor plants and application of auxins
on adventitious root formation in single noded leafy stem cuttings of teak was also investigated. Aging of donor trees suppressed
rooting and sprouting of cuttings, but increased callus formation at the base of cuttings. Per cent rooting and per cent sprouting
in cuttings decreased as age of donor plants increased from 2-months to 15-years and up to 30-years. IBA treatment promoted
per cent rooting as well as per cent sprouting, NAA promoted only rooting and it suppressed sprouting. The effect of auxin
treatment on rooting and sprouting of teak stem cuttings varied with the age of donor plants. Auxin and its concentration,
which suppressed rooting and sprouting in cuttings of younger donor plants, actually promoted rooting when cuttings were taken
from more mature donor plants. It appears that the auxin requirement for causing and promoting rooting in teak cuttings increased
with increasing age of donor plants. The higher auxin requirement for causing and promoting rooting in cuttings of older trees
may be due to a decrease in the content on endogenous auxins or decreased sensitivity of aging tissues to rooting promoters
and /or accumulation of inhibitory substances which inhibit rooting. |
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Keywords: | Aging Cuttings IBA NAA Rooting Shoot anatomy Tectona grandis |
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