ISHS Acta Horticulturae 300: In Vitro Culture, XXIII IHC
INFLUENCE OF PLANT GROWTH REGULATORS AND SEASON ON GROWTH RESPONSES OF FORCED WOODY STEMS |
| Authors: | G. Yang, Paul E. Read |
| Abstract:
Experiments were conducted to determine the feasibility of inclusion of plant growth regulating chemicals (PGR) in the forcing solution and thus influence the softwood growth of forced woody stems. GA3 in the forcing solution increased percent bud break, hastened bud break and promoted shoot elongation. However, addition of BA and thidiazuron (TDZ) in the forcing solution increased percent bud break but delayed the onset of bud break. Periodic addition of BA to the forcing solution delayed bud break, but increased percent bud break to varying degrees depending on the timing. The auxins tested in this research (IAA, NAA and IBA) inhibited bud break and shoot elongation. GA3 and the cytokinins appeared to partially substitute for the cold requirement of dormant buds. Small differences were observed among PGR treatments when stems were collected later in the winter, probably because the buds' cold requirement had been completely or partially met. | |
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