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The induction and differentiation of 8-year-old Alphonse Lavallee and Sultana grape vines were studied.
Defoliation methods enabled us to determine the induction time in grape vines as in other fruit species.

  1. Induction and differentiation in the tested varieties were not connected with temporary growth cessation; on the contrary, process took place during the most intensive growth.
  2. A correlation was found between the number of leaves and induction period. 18-21 leaves above the examined buds were needed in bot-h varieties to complete the induction.
  3. The leaf area needed for induction in a bud of Sultana was lYe times larger than that needed for Alphonse. The efficiency of the leaves of Alphonse to induce differentiation was thus greater.
  4. The primordia ,development from induction to detection under the microscope (differentiation) was connected with a constant vegetative development. The time needed for this development was determined by the growth rate of the variety (18 
       days in Sultana, 14 days in Alphonse).
  5. The translocation of materials inducing differentiation from the base of the shoot upwar,ds has not been proved in our work.
  6. In Alphonse a lag period of two days was found for the differentiation of each bud along the cane.
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The Determination of induction and differentiation in grape vines
6
The Determination of induction and differentiation in grape vines

The induction and differentiation of 8-year-old Alphonse Lavallee and Sultana grape vines were studied.
Defoliation methods enabled us to determine the induction time in grape vines as in other fruit species.

  1. Induction and differentiation in the tested varieties were not connected with temporary growth cessation; on the contrary, process took place during the most intensive growth.
  2. A correlation was found between the number of leaves and induction period. 18-21 leaves above the examined buds were needed in bot-h varieties to complete the induction.
  3. The leaf area needed for induction in a bud of Sultana was lYe times larger than that needed for Alphonse. The efficiency of the leaves of Alphonse to induce differentiation was thus greater.
  4. The primordia ,development from induction to detection under the microscope (differentiation) was connected with a constant vegetative development. The time needed for this development was determined by the growth rate of the variety (18 
       days in Sultana, 14 days in Alphonse).
  5. The translocation of materials inducing differentiation from the base of the shoot upwar,ds has not been proved in our work.
  6. In Alphonse a lag period of two days was found for the differentiation of each bud along the cane.
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