For a successful graft, the adhesion between stock and scion is a must. Which one of the following is the earliest event towards a good graft

  • [AIPMT 1990]
  • A

    Production of plasmodesmata in the cells at the interface of stock and scion

  • B

    Coordinated differentiation of vascular tissue between the stock and scion

  • C

    Regeneration of cortex and epidermis over the union of stock and scion

  • D

    Production of callus tissue between the cells of stock and scion

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