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ŠUMARSKI LIST 10-12/1991 str. 24     <-- 24 -->        PDF

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Estimate of Genetic Heterogeneity/Heritability and Genetic Gain for some


Economicaliy Important Traits in Clonal Tests of Arborescent Wilîows


S u m m a r y


Heritability estimâtes for total heights, diameters and volume stock per
ha, and for genetic gain for volume production vvere computed by sélection of
the best clones for growing in the second vegetative génération at différent
plantation âges and spacing.


A high degree of genetic control of the tested traits, with sélection of one
or five best clones, enables an increase of wood stock production by 43%, when
compared to site quality I of the Danube and lower Drava areas, depending on
the habitat, plantation age and spacings of the clone mixture.


Parameters of variability for the volume stock production hâve changée!
in the course of the ontogenetic development. Better estimâtes of heritability
for total height were obtained in older plantation âges where spacing was 3 x
3 m, while for spacing 4x4 m objective estimâtes of heritability may be made
at younger plantation âges by means of diameter and volume stock/ha. Cal dilations
of the expected estimâtes of genetic gain compared with expérimental
data express no significant statistica! déviations.


For reasons of securing stability of the ecosystem, priority was given to
five superior clones with diversified genetic constitutions in relation to one
best clone, regardless of the possibility of realizing lesser genetic gains through
multiclonal plantations.


Key w o r d s : heritability, genetic gain, clonal tests, white willow