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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| Format: | Thesis |
| Language: | English English |
| Published: |
1995
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| Online Access: | http://psasir.upm.edu.my/id/eprint/10355/ http://psasir.upm.edu.my/id/eprint/10355/1/FP_1995_3_A.pdf |
| _version_ | 1848841401446432768 |
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| author | Lam, Lai Van |
| author_facet | Lam, Lai Van |
| author_sort | Lam, Lai Van |
| building | UPM Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-15T07:42:39Z |
| format | Thesis |
| id | upm-10355 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:42:39Z |
| publishDate | 1995 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-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. Agriculture - Vietnam Hevea - Vietnam English |
| spellingShingle | Agriculture - Vietnam Hevea - Vietnam Lam, Lai Van Studies on Agronomic and Genetic Potentials of the IRRDB '81 Hevea Germplasm in Vietnam |
| title | 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_short | 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 |
| topic | Agriculture - Vietnam Hevea - Vietnam |
| url | http://psasir.upm.edu.my/id/eprint/10355/ http://psasir.upm.edu.my/id/eprint/10355/1/FP_1995_3_A.pdf |