dc.contributor.author |
Swain, Tammy-L.
|
|
dc.contributor.author |
Verryn, Stephen David
|
|
dc.contributor.author |
Laing, Mark D.
|
|
dc.date.accessioned |
2015-11-02T05:20:12Z |
|
dc.date.issued |
2015-01 |
|
dc.description.abstract |
It is important to have an understanding of the population genetics and validity
of the pertinent underlying assumptions of a species in order to design an effective
breeding strategy. In a South African breeding population of Eucalyptus nitens, various
scenarios investigating a range of assumptions were developed and used to predict genetic
gain in the F2. These were compared with realised gains achieved in a series of genetic
gain trials. In the two scenarios using firstly, actual flowering for family (provenance) and,
secondly, estimated flowering after 30 % roguing of poor families, a coefficient of relationship
of 0.33 resulted in predictions closest to realised gain, on average. The statistical
information suggested that outcrossing in the seed orchards was[80 %. Indications were
that the effects were additive, and that very little or no heterosis had occurred, due to the
still significant provenance effects and the lack of provenance rank changes in the F2. The
custom of assuming a degree of inbreeding (and using a coefficient of relationship of 0.33)
and of including provenance effects in the models, on average resulted in genetic gain
predictions which were very similar to the realised genetic gains in this population of
E. nitens. |
en_ZA |
dc.description.embargo |
2016-01-31 |
|
dc.description.librarian |
hb2015 |
en_ZA |
dc.description.sponsorship |
Masonite Ltd., Mondi Ltd, NCT Forestry Co-Operative Ltd., PG Bison, TWK Ltd. and
York Timbers Ltd. |
en_ZA |
dc.description.uri |
http://link.springer.com/journal/11056 |
en_ZA |
dc.identifier.citation |
Swain, TL, Verryn, SD & Laing, MD 2015, 'An investigation of assumptions made in estimating genetic parameters and predicting genetic gain in a Eucalyptus nitens breeding programme in South Africa', New Forests, vol. 46, no. 1, pp. 7-21. |
en_ZA |
dc.identifier.issn |
0169-4286 (print) |
|
dc.identifier.issn |
1573-5095 (online) |
|
dc.identifier.other |
10.1007/s11056-014-9444-6 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/50285 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Springer |
en_ZA |
dc.rights |
© Springer Science+Business Media Dordrecht 2014. The original publication is available at : http://link.springer.comjournal/11056. |
en_ZA |
dc.subject |
E. nitens |
en_ZA |
dc.subject |
Genetic parameters |
en_ZA |
dc.subject |
Coefficient of relationship |
en_ZA |
dc.subject |
Outcrossing |
en_ZA |
dc.subject |
Provenance effects |
en_ZA |
dc.title |
An investigation of assumptions made in estimating genetic parameters and predicting genetic gain in a Eucalyptus nitens breeding programme in South Africa |
en_ZA |
dc.type |
Postprint Article |
en_ZA |