Regulation by Uniconazole-P and Gibberellins of Morphological and Anatomical Responses of Fraxinus Mandshurica Seedlings to Gravity
1998
Jiang, Sha | Honma, Tamaki | Nakamura, Teruko | Furukawa, Ikuo | Yamamoto, Fukuju
The present study deals with roles of gibberellins (GAₛ) in gravitropic responses of woody sterns of horizontally-positioned, 2-year-old seedling of Fraxinus mandshurica Rupr. var.japonica Maxim. The application of uniconazole-P, an inhibitor of GAₛ biosynthesis, to stern nodes at various concentrations significantly inhibited not only righting the sterns but also wood formation. The application of GAₛ (GA₃ and GA₄) in combination with uniconazole-P negated the inhibitory effect of the treatment of uniconazole-P alone. The GAₛ alone did not affect wood formation, however, both GAs increased wood formation on both the upper and lower sides of horizontal sterns with an increase in the concentration of combined uniconazole-P. In all of the seedlings, tension wood was formed on the upper side of sterns. The application of uniconazole-P alone at various concentrations did not inhibit the formation of tension wood fibres.
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