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Optimising deployment of Pinus radiata : an evaluation of methods for the propagation of cuttings and the estimation of genetic parameters to quantify gains from deploying with stecklings


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McGranahan, Michelle Frances 2001 , 'Optimising deployment of Pinus radiata : an evaluation of methods for the propagation of cuttings and the estimation of genetic parameters to quantify gains from deploying with stecklings', PhD thesis, University of Tasmania.

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This thesis investigates current and potential deployment strategies using stecldings
of Pinus radiata.
The investigations showed that the growth of stecldings at 9 months of age was
influenced by the age of the stock plant from which they were propagated, the
genotype, an interaction between these two effects, and stock plant source. Stock
plants raised from seed showed the fastest growth rates and produced cuttings that
also showed the fastest growth rates. Growth of stecldings declined with increasing
stock plant age (2 to 5 years). It was also shown for most traits that estimates of genetic variance and
heritabilities were similar for seedlings and stecldings propagated from 2 year-old
stock plants, with very high genetic correlations between these propagule types.
However inflated estimates of genetic variance and heritability were found for two
out of three traits measured in stecklings propagated from 6 year-old stock plants. This
was attributed to either dominance effects or propagation effects common to a fullsib
family, C-effects. Also poor correspondence between the performances of
seedlings and stecklings propagated from 6 year-old stock plants was found for one
trait.Deployment of families as stecklings based on the performances of seedlings is
viable for cuttings that come from young stock plants (up to 2 years of age). By
comparison, the use of stecklings from older stock plants may bias the estimates of genetic merit in P. radiata and result in yields which differ from those expected from
breeding programs.
Age-age correlations were highest when comparing traits measured at later ages,
between 6 and 11 years of age, rather than between 9 months and 6 years of age and
9 months and 11 years of age. It could not be shown whether selection of superior
families can be carried out at an earlier age than is currently employed.
The study also indicates that the deployment strategy for P. radiata which will
provide the grower the highest potential economic benefit is clonal forestry. Two
modelled scenarios predicted genetic gains of a clonal forestry deployment strategy to
be at least 50 % greater than a family forestry deployment strategy.

Item Type: Thesis - PhD
Authors/Creators:McGranahan, Michelle Frances
Keywords: Pinus radiata, Pinus radiata
Copyright Holders: The Author
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Copyright 2001 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
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Additional Information:

Thesis (Ph.D.)--University of Tasmania, 2001. Includes bibliographical references

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