Relationship between gibberellin A4/7 concentration, time of treatment, and crown position on flowering of Piceaglauca
- 31 July 1984
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Forest Research
- Vol. 14 (4) , 547-553
- https://doi.org/10.1139/x84-101
Abstract
Treatment with the gibberellin mixture A4 and A7 (GA4/7) enhanced female flowering on mature white spruce (Piceaglauca (Moench) Voss). Time of treatment, crown position, and GA4/7 concentration influenced treatment success. GA4/7 treatment initiated before meristematic differentiation began (late June) enhanced female strobilus production, whereas those initiated after late June were ineffective. Shoots treated with 250 mg•L−1 GA4/7 bore significantly more female strobili than shoots that received 500 mg•L−1. Treatment did not affect female production on uppermost crown positions, male strobilus production, or seed yield per cone. Female strobili predominated from axillary buds centrally located on untreated shoots. GA4/7 treatments that enhanced female production shifted the distribution of strobili to more distal shoot positions.This publication has 2 references indexed in Scilit:
- Effect of growth regulators, girdling, and mulching on flowering of young European and Japanese larches under field conditionsCanadian Journal of Forest Research, 1982
- Applied gibberellin A4/7 increases ovulate strobili production in accelerated growth jack pine seedlingsCanadian Journal of Forest Research, 1981