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Negative gravitropism and growth stress in GA3-treated branches ofPrunus spachiana Kitamura f.spachiana cv.Plenarosea

Abstract

One of the roles of growth stress in branch shape formation was investigated using a weeping-type Japanese cherry,Prunus spachiana. Negative released strains, caused by longitudinal tensile growth stresses, were detected in the upper side of gibberellin A3-treated (GA3-treated) and control branches. The mean value of the released strain in the upper side of the treated branches was −0.104%, which was larger than the value (−0.067%) observed in the control branches. Both branches formed tension wood in the upper side of the xylem, and the treated branches formed tension wood near the pith as well. This suggested that the treated branches generated larger tensile growth stress from the early growth stages. The successive generation of growth stress from the early growth stages was considered to generate forces large enough to bend the branch upward.

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Correspondence to Masato Yoshida.

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Yoshida, M., Yamamoto, H., Okuyama, T. et al. Negative gravitropism and growth stress in GA3-treated branches ofPrunus spachiana Kitamura f.spachiana cv.Plenarosea . J Wood Sci 45, 368–372 (1999). https://doi.org/10.1007/BF01177907

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Key words

  • Negative gravitropism
  • Branch
  • Growth stress
  • Tension wood
  • Gibberellin A3