Effect of Exogenous Growth Substances on Cone Development in Scots pine (Pinussylvestris L.)

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Abstract
A number of growth substances were applied to unpollinated strobili of Scots pine to test their effect on cone development. Unpollinated strobili are normally shed early in the growing season; the application of anti-auxins stimulated cone loss but indolebutyric acid and cytokinin reduced cone loss in comparison with unpollinated controls. The development of treated cones was associated with various morphological abnormalities. Mixtures of growth substances and pollen were found to be no more effective than pollen alone in terms of yield of seed.

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