Genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh and development of propagation methods
Genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh and development of propagation methods
The present study set out to assess genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh, to selects its superior germplasm, and to develop suitable methods of vegetative and in-vitro propagation.
The genetic diversity of jackfruit in Bangladesh was assessed by means of a farmers' participatory survey, a study of morpho-agronomic characteristics and an isozyme study in the laboratory.
The superior types were selected on the basis of farmers' preferences. Ten superior types were recommended on the basis of yield per plant, fruiting season, flesh colour, flesh texture and sweetness. Cultivation of superior types may increase the production of quality jackfruit and would also extend the fruiting season in Bangladesh.
An attempt was made to develop propagation methods. Air-layering gave 86% rooting success when it was done in the month of November on current year shoots in mature trees of jackfruit. The subsequent growth of the layers in the nursery was found to be good after one years of establishment. The success rate in the nursery after one year was 80%.
The methods of grafting in respect of different seasons were standardised using scions from mature trees. Among the methods, veneer grafting in April gave the highest (80%) success. The seasons of grafting could be extended to October with epicotyl grafting and to November by cleft or splice grafting. The subsequent growth and establishment of these grafts were also found satisfactory.
In the study of in-vitro methods, 2.0 mg/1 of BAP or 0.5 mg/1 of TDZ were the effective cytokinins for multiple shoot regeneration. GA3 or Kinetin did not produce multiple shoots on a large scale. The regenerated shoots were rooted using IBA at concentrations of 2.0 to 2.5 mg/1 in in vitro culture. The in-vitro plantlets were established in the nursery. The success rate of establishment was 81-88%. The protocol for hardening and establishment of in-vitro derived plantlets in the nursery was developed for a higher success rate.
University of Southampton
1999
Azad, Abul Kalam
(1999)
Genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh and development of propagation methods.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The present study set out to assess genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh, to selects its superior germplasm, and to develop suitable methods of vegetative and in-vitro propagation.
The genetic diversity of jackfruit in Bangladesh was assessed by means of a farmers' participatory survey, a study of morpho-agronomic characteristics and an isozyme study in the laboratory.
The superior types were selected on the basis of farmers' preferences. Ten superior types were recommended on the basis of yield per plant, fruiting season, flesh colour, flesh texture and sweetness. Cultivation of superior types may increase the production of quality jackfruit and would also extend the fruiting season in Bangladesh.
An attempt was made to develop propagation methods. Air-layering gave 86% rooting success when it was done in the month of November on current year shoots in mature trees of jackfruit. The subsequent growth of the layers in the nursery was found to be good after one years of establishment. The success rate in the nursery after one year was 80%.
The methods of grafting in respect of different seasons were standardised using scions from mature trees. Among the methods, veneer grafting in April gave the highest (80%) success. The seasons of grafting could be extended to October with epicotyl grafting and to November by cleft or splice grafting. The subsequent growth and establishment of these grafts were also found satisfactory.
In the study of in-vitro methods, 2.0 mg/1 of BAP or 0.5 mg/1 of TDZ were the effective cytokinins for multiple shoot regeneration. GA3 or Kinetin did not produce multiple shoots on a large scale. The regenerated shoots were rooted using IBA at concentrations of 2.0 to 2.5 mg/1 in in vitro culture. The in-vitro plantlets were established in the nursery. The success rate of establishment was 81-88%. The protocol for hardening and establishment of in-vitro derived plantlets in the nursery was developed for a higher success rate.
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Published date: 1999
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Local EPrints ID: 463785
URI: http://eprints.soton.ac.uk/id/eprint/463785
PURE UUID: 244264ed-014d-4142-90c3-b7dc779001b4
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Date deposited: 04 Jul 2022 20:57
Last modified: 04 Jul 2022 20:57
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Author:
Abul Kalam Azad
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