Role of Apophysis and Outer Scale Tissue in Pine Cone Opening
Removing the apophysis and outer part of the cone scale of seven species of southern pines reduced the time for the cone scales to begin opening, to complete opening, and shed seed. The amount of oleoresin and the resin acid: turpentine ratios were greater in the apophysis + outer part of the cone scales than in the inner part of cone scales + cone axis of most samples. The increased oleoresin content in the outer part of the scales may contribute to keeping cones closed before they dehydrate and open in the autumn, and contribute to case hardening from improper harvesting and drying. Soaking cones in acetone for 4 hours to dissolve resin in the apophysis and outer part of the scales only slightly hastened cone opening. Acetone treatment reduced seed germination below control seeds and seeds from peeled cones. The major monoterpenes in cone scales were α and pinene. Forest Sci. 27:828-836.
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Document Type: Journal Article
Affiliations: Professor (Biochemist) Fruit Crops Department, University of Florida, Gainesville, FL 32611
Publication date: 1981-12-01
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