Abstract
Abstract Cuttings of young potato plants (Solanum tuberosum L.) were used as a technique for evaluating the influence of temperature and photoperiod on the degree of tuber induction. Growth chambers were used to create four combinations of two air temperature regimes (“hot”, 30C day/25C night, or “cool”, 20C day/15C night) and two photoperiods (“long photoperiod”, 16 hr of light, or “short photoperiod”, 10 hr of light). The six cultivars and clones tested exhibited varying degrees of induction. Early maturing cultivars, such as ‘Norchip’ and ‘Cl-884’, were less affected by increased temperature with short photoperiod or by longer photoperiod under cool temperatures than were other cultivars. Raising the temperature under short photoperiod caused a reduction of about 50% in tuber dry weight from cuttings of the late-maturing ‘Katahdin’. Long photoperiod intensified the effects of higher temperature in reducing induction, especially with later-maturing cultivars such as ‘Katahdin’ and ‘Désirée’.
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