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The effect of developmental stage on direction of translocation of photosynthate in Vitis vinifera

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  • Hale, Charles R.
  • Weaver, Robert J.

Abstract

The direction of translocation of C14 following the assimilation of C14O2 by single leaves or shoot tips of the Muscat of Alexandria grapevine was determined by using radioautographic techniques. The first assimilate exported by the treated leaf was to the shoot tip. When the treated leaf was separated from the oldest importing leaf on the shoot tip by two or three other exporting leaves, the assimilate from the leaf was translocated both to the shoot tip and to the parent vine. With further shoot growth the basipetal movement predominated until translocation from a treated leaf below the shoot tip was completely reversed and was basipetal only. Translocation from leaves below the cluster was partially reversed again when fruit development started. Assimilate from these leaves was translocated both to the fruit cluster and parent vine. After the rate of shoot elongation decreased sharply, radiocarbon moved from the shoot tip in a basipetal direction.

Suggested Citation

  • Hale, Charles R. & Weaver, Robert J., 1962. "The effect of developmental stage on direction of translocation of photosynthate in Vitis vinifera," Hilgardia, California Agricultural Experiment Station, vol. 33(3).
    • Handle: RePEc:ags:hilgar:381283
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