Abstract
Seedling populations segregating for the critical photoperiod that controls tuberization may be screened by a cutting technique. Plants are grown under daily photoperiods which are at first long (e.g., 20 hours) and which are shortened at two-week intervals. Apical cuttings and single-node, sub-apical cuttings are taken at the end of each two-week period. The cuttings are maintained in a mist chamber under a 20-hour photoperiod for 10–14 days. The photoperiod that first promotes tuberization on cuttings may be considered as the critical photoperiod.
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