dc.contributor.author |
Komakech Otim, C
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dc.date.accessioned |
2010-01-15T07:18:29Z |
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dc.date.available |
2010-01-15T07:18:29Z |
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dc.date.issued |
2008-12 |
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dc.identifier.citation |
Komakech Otim, C. 2008. Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa. Thesis dissertation, School of Biochemistry, Genetics, Microbiology and Plant Pathology, University of KwaZulu-Natal, December 2008 |
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dc.identifier.uri |
http://hdl.handle.net/10204/3889
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dc.description |
Submitted in Fulfillment of the Academic Requirements of the Degree of Master of Science in the School of Biochemistry, Genetics, Microbiology and Plant Pathology, University of KwaZulu-Natal. |
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dc.description.abstract |
A study was undertaken to compare growth potential of three Eucalyptus species of natural origin in South Eastern Australia, with commercially grown species on mid and high altitude temperate sites in the summer rainfall growing zones in South Africa. The three species were Eucalyptus globulus subsp. bicostata (E. bicostata), Eucalyptus cypellocarpa and Eucalyptus nobilis. Nine sites were selected to represent the growing areas of South Africa experiencing cold winter drought with occasional snow falls. Improved, commercially grown pure Eucalyptus species and interspecific hybrid clones were included as controls in the trials to give comparative growth performances on specific sites. Both balanced and unbalanced lattice designs were used to evaluate the growth potential of the unimproved Australian species and the improved commercial controls incorporated into the trials. Volume production and basal area growth were assessed for the three species at all sites. However, only three sub species E.globulus (E. bicostata, E. maidenii and E. globulus) showed varying levels of disease (Mychosphaerella nobilosa) infestation and this was therefore assessed in trials at 12 and 30 months respectively, and correlation analysis was used to study the relationship between the impact of disease infestation and growth performance. It was found that negative phenotypic correlations existed between the levels of infection and tree growth. ie greater infection slower growth. Evaluation of genotype x environment interaction (GXE) revealed that this did not exist in the E. bicostata nor E. nobilis populations, and therefore one population of each species can be developed for all the sites tested. E. cypellocarpa was the only species that showed some GXE interaction implying that separate populations to be developed for different sites. Contrary to what was expected, unimproved Eucalyptus species being investigated performed equally as well as the improved commercial species included as controls, thus providing potential for commercial deployment with selection and breeding. |
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dc.language.iso |
en |
en |
dc.publisher |
University of KwaZulu Natal |
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dc.subject |
Eucalyptus bicostata |
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dc.subject |
Eucalyptus cypellocarpa |
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dc.subject |
Eucalyptus nobilis |
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dc.subject |
Summer rainfall region |
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dc.subject |
Plant pathology |
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dc.subject |
Microbiology |
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dc.subject |
Genetics |
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dc.subject |
Biochemistry |
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dc.title |
Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa |
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dc.type |
Report |
en |
dc.identifier.apacitation |
Komakech Otim, C. (2008). <i>Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa</i> University of KwaZulu Natal. Retrieved from http://hdl.handle.net/10204/3889 |
en_ZA |
dc.identifier.chicagocitation |
Komakech Otim, C <i>Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa.</i> University of KwaZulu Natal, 2008. http://hdl.handle.net/10204/3889 |
en_ZA |
dc.identifier.vancouvercitation |
Komakech Otim C. Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa. 2008 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/3889 |
en_ZA |
dc.identifier.ris |
TY - Report
AU - Komakech Otim, C
AB - A study was undertaken to compare growth potential of three Eucalyptus species of natural origin in South Eastern Australia, with commercially grown species on mid and high altitude temperate sites in the summer rainfall growing zones in South Africa. The three species were Eucalyptus globulus subsp. bicostata (E. bicostata), Eucalyptus cypellocarpa and Eucalyptus nobilis. Nine sites were selected to represent the growing areas of South Africa experiencing cold winter drought with occasional snow falls. Improved, commercially grown pure Eucalyptus species and interspecific hybrid clones were included as controls in the trials to give comparative growth performances on specific sites. Both balanced and unbalanced lattice designs were used to evaluate the growth potential of the unimproved Australian species and the improved commercial controls incorporated into the trials. Volume production and basal area growth were assessed for the three species at all sites. However, only three sub species E.globulus (E. bicostata, E. maidenii and E. globulus) showed varying levels of disease (Mychosphaerella nobilosa) infestation and this was therefore assessed in trials at 12 and 30 months respectively, and correlation analysis was used to study the relationship between the impact of disease infestation and growth performance. It was found that negative phenotypic correlations existed between the levels of infection and tree growth. ie greater infection slower growth. Evaluation of genotype x environment interaction (GXE) revealed that this did not exist in the E. bicostata nor E. nobilis populations, and therefore one population of each species can be developed for all the sites tested. E. cypellocarpa was the only species that showed some GXE interaction implying that separate populations to be developed for different sites. Contrary to what was expected, unimproved Eucalyptus species being investigated performed equally as well as the improved commercial species included as controls, thus providing potential for commercial deployment with selection and breeding.
DA - 2008-12
DB - ResearchSpace
DP - CSIR
KW - Eucalyptus bicostata
KW - Eucalyptus cypellocarpa
KW - Eucalyptus nobilis
KW - Summer rainfall region
KW - Plant pathology
KW - Microbiology
KW - Genetics
KW - Biochemistry
LK - https://researchspace.csir.co.za
PY - 2008
T1 - Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa
TI - Growth potential of alternative eucalyptus species for mid and high altitude sites in the summer rainfall region in South Africa
UR - http://hdl.handle.net/10204/3889
ER -
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en_ZA |