Juvenile genetic parameter estimates for vigour,stem form,branching habit and survival in three radiata pine (<Emphasis Type="Italic">Pinus radiata</Emphasis> D.Don) progeny tests in Galicia,NW Spain |
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| Authors: | V Codesido J Fernández-López |
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| Institution: | (1) Departamento de Producción Forestal, CINAM-Lourizán, Apt. Correos 127, 36080 Pontevedra, Spain |
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| Abstract: | Individual and family heritabilities, as well as phenotypic and genetic correlations were estimated 2 and 3 years after plantation,
in progeny tests carried out in plantations of open-pollinated Pinus radiata D.Don progeny located at three different sites in Galicia (NW Spain). The following factors were considered: survival, growth
(free growth, height, diameter, volume, height/diameter ratio), form (number of branches, number of whorls, number of branches
per whorl, number of branches per tree height meter, number of ramicorn branches, diameter of the thickest branch, internode
length, branch angle, stem straightness, stem sinuosity, number of forks) and resistance (frost and insect resistance). Each
plantation contained 50 female parents that had been selected as plus trees in genetically unimproved plantations in Galicia,
as well as 6 female parents selected from the radiata pine breeding programme in the Basque Country (northern Spain) and two
commercial lots of seed from Galicia, as controls. Individual heritabilities varied from low to high levels for each trait
studied. Family heritabilities followed similar trends for individual heritabilities, but were of much greater magnitude.
The results suggested that all traits except the number of branches per whorl and insect resistance could be expected to respond
to selection based on individual performance. The less heritable traits could be improved by progeny testing. Height and diameter
were strongly and positively correlated, and both traits were also correlated with the number of branches, the number of whorls
and the branch diameter. The results are compared with previously published data and discussed in relation to the implications
for breeding activities. |
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| Keywords: | Juvenile selection traits Heritability Phenotypic and genetic correlation Breeding programme |
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