Effects of gibberellin A4/7 stem injection on seed cone production in mature black spruce
1997
Brockerhoff, E.G. | Ho, R.H.
Two injections of 50 mg of gibberellin A4/7 (GA4/7) into the trunk base of 27-year-old black spruce, Picea mariana (Mill.) BSP, during rapid vegetative shoot elongation gave a fourfold significant increase of seed cone production in the following year compared with controls. Treated trees produced a mean number of 309 +/- 28 SE cones versus 57 +/- 7 and 83 +/- 10 produced by untreated trees and by control trees injected with 95% ethanol (the solvent used), respectively. A similar increase was reflected in the mean total weight per tree of nearly mature cones. It is shown that GA4/7 was able to induce additional cone buds during a very heavy cone crop. Potential effects of gibberellin treatments on phytophagous insects are discussed.
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