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Propagation through juvenile shoot cuttings in difficult-to-root Dalbergia latifolia – examining role of endogenous IAA in adventitious rooting

Propagation through juvenile shoot cuttings in difficult-to-root Dalbergia latifolia – examining... Dalbergia latifolia Roxb. is a premium-quality high-priced timber species of poor rooting ability restricting the propagation of its superior germplasm. Non-sustainable exploitation of the species left its natural population dwindling and vulnerable (VU) status. Despite its high market value, its occurrence is sporadic in natural forests and plantations are ‘rare’ in central India. With the aim of improvement in rooting ability, the seedling progeny of 10 selected superior germplasm of D. latifolia was raised for propagation through juvenile shoot cuttings. Progeny was hedged yearly in the last week of April and juvenile shoot cuttings were used for the experiment. With the varying rooting ability of progenies, an average of 35.83% adventitious rooting was achieved in shoot cuttings from 1 to 2 year-old progenies with basal dip treatment of 2.0mM IAA which gradually decline in successive years. 4–5 years old progenies exhibited 30.33% adventitious rooting with basal dip treatment of 5.0mM IAA. Further reduction in adventitious rooting was recorded in cuttings from 8 to 9 years and 10–11 years old progenies that exhibited 26.33% and 27.00% adventitious rooting with basal dip treatment of 5.0mM IAA + 1.0mM Boric Acid. Endogenous indole-3-acetic acid (IAA) available at the base of cuttings exhibited a non-significant relationship with the rooting ability for progenies of different ages. Besides, transport and availability of exogenously applied rooting hormone regulate the lateral movement of endogenously available IAA to the target cells in the pericyclic region substantially promoting the induction of adventitious rooting. Therefore, the use of juvenile shoot cuttings from progenies of selected trees was the most efficient procedure for the production of quality planting stock of Dalbergia latifolia. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology Reports Springer Journals

Propagation through juvenile shoot cuttings in difficult-to-root Dalbergia latifolia – examining role of endogenous IAA in adventitious rooting

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References (54)

Publisher
Springer Journals
Copyright
Copyright © Indian Society for Plant Physiology 2022
ISSN
2662-253X
eISSN
2662-2548
DOI
10.1007/s40502-022-00664-x
Publisher site
See Article on Publisher Site

Abstract

Dalbergia latifolia Roxb. is a premium-quality high-priced timber species of poor rooting ability restricting the propagation of its superior germplasm. Non-sustainable exploitation of the species left its natural population dwindling and vulnerable (VU) status. Despite its high market value, its occurrence is sporadic in natural forests and plantations are ‘rare’ in central India. With the aim of improvement in rooting ability, the seedling progeny of 10 selected superior germplasm of D. latifolia was raised for propagation through juvenile shoot cuttings. Progeny was hedged yearly in the last week of April and juvenile shoot cuttings were used for the experiment. With the varying rooting ability of progenies, an average of 35.83% adventitious rooting was achieved in shoot cuttings from 1 to 2 year-old progenies with basal dip treatment of 2.0mM IAA which gradually decline in successive years. 4–5 years old progenies exhibited 30.33% adventitious rooting with basal dip treatment of 5.0mM IAA. Further reduction in adventitious rooting was recorded in cuttings from 8 to 9 years and 10–11 years old progenies that exhibited 26.33% and 27.00% adventitious rooting with basal dip treatment of 5.0mM IAA + 1.0mM Boric Acid. Endogenous indole-3-acetic acid (IAA) available at the base of cuttings exhibited a non-significant relationship with the rooting ability for progenies of different ages. Besides, transport and availability of exogenously applied rooting hormone regulate the lateral movement of endogenously available IAA to the target cells in the pericyclic region substantially promoting the induction of adventitious rooting. Therefore, the use of juvenile shoot cuttings from progenies of selected trees was the most efficient procedure for the production of quality planting stock of Dalbergia latifolia.

Journal

Plant Physiology Reports – Springer Journals

Published: Jun 1, 2022

Keywords: Germplasm; Seedling progeny; Rooting ability; Juvenile-mature gradient; Indole-3-acetic acid; Conservation

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