Abstract
DURING an investigation of the part played by gibberellins in the induction of nucleic acid synthesis in resting potato buds, the question arose as to whether wounding of the tuber can cause any changes in the activity of endogenous gibberellin-like substances. Histoautoradio-graphic techniques have shown that tritiated thymidine incorporates into DNA of potato plugs (0.5 × 0.5 cm) containing buds, but not into buds of intact resting tubers. Other unpublished results suggest that labelling is localized chiefly at the periphery of the plug, the vascular system and the bud apex and leaf bases. Gibberellin A3 markedly promotes the incorporation of tritiated precursors into RNA and DNA within the same regions. Possibly wounding associated with excision of potato plugs enhances gibberellin activity which may in turn be responsible for other consequences of wounding.
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References
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RAPPAPORT, L., SACHS, M. Wound-induced Gibberellins. Nature 214, 1149–1150 (1967). https://doi.org/10.1038/2141149a0
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DOI: https://doi.org/10.1038/2141149a0
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