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Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam

Studies were conducted to evaluate the agronomic potential and to investigate the genetic structure and variability of the new Hevea germplasm which had been collected from the three states of Acre, Mato Grosso and Rondonia in Brazil, South America, by the International Rubber Research and Deve...

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Main Author: Lam, Lai Van
Format: Thesis
Language:English
English
Published: 1995
Online Access:http://psasir.upm.edu.my/id/eprint/10355/1/FP_1995_3_A.pdf
http://psasir.upm.edu.my/id/eprint/10355/
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spelling my.upm.eprints.103552011-03-28T04:22:37Z http://psasir.upm.edu.my/id/eprint/10355/ Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam Lam, Lai Van Studies were conducted to evaluate the agronomic potential and to investigate the genetic structure and variability of the new Hevea germplasm which had been collected from the three states of Acre, Mato Grosso and Rondonia in Brazil, South America, by the International Rubber Research and Development Board (IRRDB). A total of 1309 new Hevea germplasm clones and 32 Wickham (domesticated) clones was evaluated on agronomic performance, physiological characateristics of latex, bark anatomy and properties of rubber in two field experiments at the Rubber Research Institute of Vietnam (RRIV), Vietnam. In general, the germplasm clones were far inferior to the Wickham clones in latex productivity, and to a lesser extent, in growth. The germplasm genotypes also possessed undesirable characteristics of crown structure. Studies on physiological characteristics of latex showed that the germplasm clones were poor in the activity of latex regeneration and showed difficulty in the flow of latex. They also had anatomical characteristics of the bark unfavourable towards the productivity of latex. However, properties of rubber derived from the germplasm clones were technically acceptable. Genotypic and phenotypic coefficients of variation for yield were found very high in the germplasm population. The new germplasm had moderate to very high broad sense heritabilities (h2O) for economic characters such as yield, growth, number of latex vessel rings and plugging index. Results of the study on genetic distance showed that there was a great genetic distance between the germplasm clones and the Wickham clones. Based on genetic divergence, the germplasm could be divided into three groups in agreement with their geographical origins, namely Acre, Mato Grosso and Rondonia. For any geographical group, variability due to clones accounted for most of the variabilities for yield and growth. 1995 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/10355/1/FP_1995_3_A.pdf Lam, Lai Van (1995) Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam. Masters thesis, Universiti Pertanian Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description Studies were conducted to evaluate the agronomic potential and to investigate the genetic structure and variability of the new Hevea germplasm which had been collected from the three states of Acre, Mato Grosso and Rondonia in Brazil, South America, by the International Rubber Research and Development Board (IRRDB). A total of 1309 new Hevea germplasm clones and 32 Wickham (domesticated) clones was evaluated on agronomic performance, physiological characateristics of latex, bark anatomy and properties of rubber in two field experiments at the Rubber Research Institute of Vietnam (RRIV), Vietnam. In general, the germplasm clones were far inferior to the Wickham clones in latex productivity, and to a lesser extent, in growth. The germplasm genotypes also possessed undesirable characteristics of crown structure. Studies on physiological characteristics of latex showed that the germplasm clones were poor in the activity of latex regeneration and showed difficulty in the flow of latex. They also had anatomical characteristics of the bark unfavourable towards the productivity of latex. However, properties of rubber derived from the germplasm clones were technically acceptable. Genotypic and phenotypic coefficients of variation for yield were found very high in the germplasm population. The new germplasm had moderate to very high broad sense heritabilities (h2O) for economic characters such as yield, growth, number of latex vessel rings and plugging index. Results of the study on genetic distance showed that there was a great genetic distance between the germplasm clones and the Wickham clones. Based on genetic divergence, the germplasm could be divided into three groups in agreement with their geographical origins, namely Acre, Mato Grosso and Rondonia. For any geographical group, variability due to clones accounted for most of the variabilities for yield and growth.
format Thesis
author Lam, Lai Van
spellingShingle Lam, Lai Van
Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam
author_facet Lam, Lai Van
author_sort Lam, Lai Van
title Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam
title_short Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam
title_full Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam
title_fullStr Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam
title_full_unstemmed Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam
title_sort studies on agronomic and genetic potentials of the irrdb '81 hevea germplasm in vietnam
publishDate 1995
url http://psasir.upm.edu.my/id/eprint/10355/1/FP_1995_3_A.pdf
http://psasir.upm.edu.my/id/eprint/10355/
_version_ 1643824580811292672
score 13.211869

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