Inheritance of Turpentine Composition inPius Attenuata×RadiataHybrids

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Abstract
Samples of turpentine from 50 F1 and F2 Pinus attenuata × radiata hybrids and related trees were analysed by vapour-phase chromatography. The results suggest that the major difference between the turpentines of these two species is controlled by a single gene, but since variation in F1 hybrids and those within the range of wild P. radiata is of a continuous nature, a multifactorial system of modifiers is probably present in this species. Because many F2 and backcross hybrids were found to have turpentine resembling that of the parent species, it was concluded that this character alone cannot provide reliable evidence of hybridity.

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