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Estimation of genetic and non-genetic parameters for rooting traits in hybrid larch


, : Estimation of genetic and non-genetic parameters for rooting traits in hybrid larch. Silvae Genetica 43(2-3): 108-114

Two experiments were established in 1992 and repeated in 1993 to study genetic and non-genetic effects on rootability of hybrid larch cuttings. Cuttings from 80 clones of 8 full-sib families were rooted in the first experiment. In the second one, 3 primary ramets from each of 24 clones were used as the source of cuttings. Rooting percentage, stem increment length and in part of the experiments, some more detailed rooting traits were assessed. Both strong clonal and less significant family effects were found on the rootability of cuttings. Importance of genetic control was proved by a high broad-sense heritability based on clone means. A non-genetic effect or 'C-effect' could be an important source of bias in genetic parameter estimation. Low genetic correlations were found between rooting percentage and shoot increment. However stem increment was well correlated with some detailed root system traits.

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