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    Description

    One-year-old western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings from three open-pollination families from eight locations in the Washington and Oregon Coast Ranges were cultured under accelerated growth conditions in a glasshouse. Forty cuttings from each of five seedlings (open-pollination siblings) per family were then placed in a rooting box in a randomized block design with five replications. Percentages of cuttings rooted after 1 year in the bed were analyzed in a hierarchal design.

    Average rooting percentage was 72.4 percent. Significant effects were associated only with replication, siblings-in-families-in-provenances (S/F/P), and with the interaction, S/F/P x replication. The last two together accounted for 73 percent of the variance.

    The results indicated that additive genetic effects were not important to rooting success, but that dominance and unique clone-effects probably were.

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    Citation

    Sorensen, Frank C.; Campbell, Robert K. 1980. Genetic variation in rootability of cuttings from one-year-old western hemlock seedlings. Res. Note PNW-RN-352. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 8 p

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    Keywords

    Heritability, provenance, genetic traits, rooting ability, western hemlock, Tsuga heterophylla

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https://www.fs.usda.gov/treesearch/pubs/7618