Studies on the heritability of SO2 resistance in Scots pine and Douglas fir

Tzschacksch, O.

Beitrage fur die Forstwirtschaft 16(3): 103-106


Accession: 001129489

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Laboratory studies were made on detached branches of 10-yr-old pine or 9-yr-old Douglas fir progeny of controlled crossings of parents of known resistance to the development of SO2-induced needle necroses. The general combining ability for SO2 resistance was relatively high in pine and nearly statistically significant in Douglas fir. Heritability coefficients were 0.6 for pine and 0.65 (narrow-sense)/0.79 (broad-sense) for Douglas fir. The results are considered promising in relation to breeding for SO2 resistance in the two species.