Foliar application of GA3 during terminal long-shoot bud development stimulates shoot apical meristem activity in Pinus sylvestris seedlings.
The effect of exogenous gibberellin (GA3) on shoot apical meristem activity in conifer vegetative buds was investigated by spraying 0 or 0.1% GA3 on the foliage of first-year Scots pine (Pinus sylvestris L.) seedlings twice weekly for 9 weeks during development of the terminal long-shoot bud. Exogenous GA3 promoted mitotic activity in the apical zone, thereby increasing both the rate and duration of cataphyll formation and giving rise to a higher and wider apical meristem. The increase in number of cataphylls increased the number of axillary meristems, which developed as short-shoot buds.
MacDonald
Joanne E
JE
Natural Resources Canada, Canadian Forest Service-Atlantic Forestry Centre, Fredericton, NB E3B 5P7, Canada. jomacdon@nrcan.gc.ca
Little
C H Anthony
CH
D002454:Cell Differentiation / Q000187:drug effects; D005875:Gibberellins / Q000494:pharmacology*; D018519:Meristem / Q000166:cytology / Q000187:drug effects* / Q000254:growth & development; D008938:Mitosis / Q000187:drug effects; D041605:Pinus sylvestris / Q000166:cytology / Q000187:drug effects* / Q000254:growth & development; D010937:Plant Growth Regulators / Q000494:pharmacology*; D036226:Seedlings / Q000166:cytology / Q000187:drug effects* / Q000254:growth & development; D013997:Time Factors; D014197:Trees / Q000166:cytology / Q000187:drug effects* / Q000254:growth & development
D005875:Gibberellins; D010937:Plant Growth Regulators; C007842:gibberellic acid