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In vitro Polyploidisation of Neolamarckia cadamba using Colchicine

Polyploidisation has become a valuable breeding strategy of Neolamarckia cadamba to produce improved clones for planted forest development. It is a multipurpose fast-growing plantation tree species that produce high-value wood and non-wood forest products. The present study aimed to induce polyploid...

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Main Author: Eng, Wee Hiang
Format: Thesis
Language:English
English
Published: Universiti Malaysia Sarawak 2021
Subjects:
QK Botany
S Agriculture (General)
SD Forestry
Online Access:http://ir.unimas.my/id/eprint/36624/3/24pages.pdf
http://ir.unimas.my/id/eprint/36624/10/Eng%20Wee%20Hiang%20ft.pdf
http://ir.unimas.my/id/eprint/36624/
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spelling my.unimas.ir.366242024-09-13T02:10:43Z http://ir.unimas.my/id/eprint/36624/ In vitro Polyploidisation of Neolamarckia cadamba using Colchicine Eng, Wee Hiang QK Botany S Agriculture (General) SD Forestry Polyploidisation has become a valuable breeding strategy of Neolamarckia cadamba to produce improved clones for planted forest development. It is a multipurpose fast-growing plantation tree species that produce high-value wood and non-wood forest products. The present study aimed to induce polyploid plants using colchicine under in vitro system and to determine the effects of in vitro polyploidisation on colchicine-induced polyploid plants of N. cadamba derived from nodal explants. The results showed that 0.3% colchicine for 48 h treatment of N. cadamba nodal segments produced the highest percentage of polyploidisation, where 20.0% were octoploids and 6.7% were mixoploids. In the flow cytometry procedure, LB01 buffer and in vitro leaf usage was crucial in obtaining reliable results, where the tetraploid DNA content was 2.59 ± 0.09 pg, while the octoploid was 5.35 ± 0.24 pg. The chromosome count procedure was optimised, namely using juvenile roots, using a combination of Feulgen and aceto-orcein 1% stains and employing double squashing. The chromosome count confirmed that the tetraploid cell of N. cadamba has 44 chromosomes while the octoploid cell has 88 chromosomes. The N. cadamba octoploid and mixoploid plants grow slower than the tetraploid under in vitro and ex vitro conditions. The leaf characteristics of N. cadamba mixoploid and octoploid plants were thicker leaf blades, thicker midrib, bigger stomata size, lower stomata density, and higher SPAD value than their progenitor. Genetic variation was detected among the mixoploid and octoploid plants using RAPD, and this result suggests that in vitro polyploidisation could be used to broaden the genetic base of N. cadamba. Collectively, this study has established an efficient protocol for in vitro induction and identification of polyploid plants of N. cadamba by colchicine treatment. The newly identified polyploid plants in the present study can potentially benefit the future breeding programme and genomics research of N. cadamba. Universiti Malaysia Sarawak 2021-11-08 Thesis NonPeerReviewed text en http://ir.unimas.my/id/eprint/36624/3/24pages.pdf text en http://ir.unimas.my/id/eprint/36624/10/Eng%20Wee%20Hiang%20ft.pdf Eng, Wee Hiang (2021) In vitro Polyploidisation of Neolamarckia cadamba using Colchicine. PhD thesis, Universiti Malaysia Sarawak.
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
English
topic QK Botany
S Agriculture (General)
SD Forestry
spellingShingle QK Botany
S Agriculture (General)
SD Forestry
Eng, Wee Hiang
In vitro Polyploidisation of Neolamarckia cadamba using Colchicine
description Polyploidisation has become a valuable breeding strategy of Neolamarckia cadamba to produce improved clones for planted forest development. It is a multipurpose fast-growing plantation tree species that produce high-value wood and non-wood forest products. The present study aimed to induce polyploid plants using colchicine under in vitro system and to determine the effects of in vitro polyploidisation on colchicine-induced polyploid plants of N. cadamba derived from nodal explants. The results showed that 0.3% colchicine for 48 h treatment of N. cadamba nodal segments produced the highest percentage of polyploidisation, where 20.0% were octoploids and 6.7% were mixoploids. In the flow cytometry procedure, LB01 buffer and in vitro leaf usage was crucial in obtaining reliable results, where the tetraploid DNA content was 2.59 ± 0.09 pg, while the octoploid was 5.35 ± 0.24 pg. The chromosome count procedure was optimised, namely using juvenile roots, using a combination of Feulgen and aceto-orcein 1% stains and employing double squashing. The chromosome count confirmed that the tetraploid cell of N. cadamba has 44 chromosomes while the octoploid cell has 88 chromosomes. The N. cadamba octoploid and mixoploid plants grow slower than the tetraploid under in vitro and ex vitro conditions. The leaf characteristics of N. cadamba mixoploid and octoploid plants were thicker leaf blades, thicker midrib, bigger stomata size, lower stomata density, and higher SPAD value than their progenitor. Genetic variation was detected among the mixoploid and octoploid plants using RAPD, and this result suggests that in vitro polyploidisation could be used to broaden the genetic base of N. cadamba. Collectively, this study has established an efficient protocol for in vitro induction and identification of polyploid plants of N. cadamba by colchicine treatment. The newly identified polyploid plants in the present study can potentially benefit the future breeding programme and genomics research of N. cadamba.
format Thesis
author Eng, Wee Hiang
author_facet Eng, Wee Hiang
author_sort Eng, Wee Hiang
title In vitro Polyploidisation of Neolamarckia cadamba using Colchicine
title_short In vitro Polyploidisation of Neolamarckia cadamba using Colchicine
title_full In vitro Polyploidisation of Neolamarckia cadamba using Colchicine
title_fullStr In vitro Polyploidisation of Neolamarckia cadamba using Colchicine
title_full_unstemmed In vitro Polyploidisation of Neolamarckia cadamba using Colchicine
title_sort in vitro polyploidisation of neolamarckia cadamba using colchicine
publisher Universiti Malaysia Sarawak
publishDate 2021
url http://ir.unimas.my/id/eprint/36624/3/24pages.pdf
http://ir.unimas.my/id/eprint/36624/10/Eng%20Wee%20Hiang%20ft.pdf
http://ir.unimas.my/id/eprint/36624/
_version_ 1811600355868278784
score 13.211869

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