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      Question

      What is the primary physiological cause of 'Graft

      Incompatibility' in Pyrus-Quince combinations?
      A Water stress Correct Answer Incorrect Answer
      B Accumulation of Prunasin Correct Answer Incorrect Answer
      C Lack of nutrients Correct Answer Incorrect Answer
      D Fungal infection Correct Answer Incorrect Answer

      Solution

      Prunasin from the Quince rootstock moves to the Pear scion and breaks down into toxic hydrocyanic acid. This biochemical reaction leads to the death of cells at the graft union and eventual failure.

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