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Differential flowering responses by young Douglas-Fir grafts and equi-sized seedlings to gibberellins and auxin


, : Differential flowering responses by young Douglas-Fir grafts and equi-sized seedlings to gibberellins and auxin. Acta Horticulturae (56): 163-168

Flowering was significantly increased on 2-year-old grafts of Pseudotsuga menziesii, but only slightly increased on 4-year-old seedlings of similar physical size, by biweekly applications during April-June of a mixture of GA4 + GA7. Application of GA9 was less effective and of GA3 was ineffective; GA5 promoted only male strobili and only on the grafts. Addition of NAA tended to stimulate male strobili in the grafts.


Accession: 000339504

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Related references

Ross, S.D.; Pharis, R.P., 1976: Promotion of flowering in the Pinaceae by gibberellins. I. Sexually mature, non-flowering grafts of Douglas-Fir. Reports results of applying gibberellin (GA) to 4-year-old grafts taken from plus-trees of a coastal Oregon provenance of Pseudotsuga menziesii. Biweekly applications of GA (as GA4 + GA7) at 400 mu g per branch, in the second and third whorls, gav...

Pharis, R.; Ross, S.; Mcmullan, E., 1980: Promotion of flowering in the Pinaceae by gibberellins. III. Seedlings of Douglas fir. Physiologia plantarum 50(2): 119-126

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