STUDIES ON TUBERIZATION IN SOLANUM ANDIGENA: I. EVIDENCE FOR THE EXISTENCE AND MOVEMENT OF A SPECIFIC TUBERIZATION STIMULUS

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Abstract
SUMMARY: Experiments were carried out with a clone of Solanum andigena, which requires short photo‐periods for tuberization, to investigate whether or not tuberization involves a specific stimulus. It was shown that a tuberization stimulus can be transmitted by grafting induced on to non‐induced shoots and that even small pieces of stem from induced plants are capable of transmitting the stimulus. The results of these and other experiments support the view that tuberization is determined by a specific stimulus, rather than by the availability of non‐specific photosynthates. It is shown that the stimulus can move both basipetally and acropetally, but tuber development occurs only at the physically lowest nodes of stem cuttings, whether these are normally orientated or inverted.

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