Existence d'un stimulus photopériodique non spécifique capable de provoquer la tubérisation chezHelianthus tuberosusL.

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Abstract
SummaryGrafting experiments between a, tuber-forming species, Helianthus tuberosus, and a species incapable of forming tubers, H. annuus, have shown that: (1) the tuber-forming species is capable of producing tubers even when it. is grafted on roots of the non-tuber-forming one; (2) the tuber-forming stimulus is truly photoperiodic because it. is not produced if the long night is interrupted by 1 hr of low-intensity, red light; (3) the stimulus can pass through the stem of the species incapable of forming tubers without being destroyed; (4) the stimulus is unspecific, because it can be generated even in a species incapable of forming tubers and generally thought to be non photoperiodic, namely Helianthus annuus.