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Two controlled-environment experiments were conducted to determine the effects of temperature fluctuations under continuous irradiation on growth and tuberization of two potato (Solanum tuberosum L.) cultivars, Kennebec and Superior.  These cultivars had exhibited chlorotic and stunted growth under continuous irradiation and constant temperatures.  The plants were grown for 4 weeks in the first experiment and for 6 weeks in the second experiment.  Each experiment was conducted under continuous irradiation of 400 micromoles per square meter per second of photosynthetic photon flux and included two temperature treatments:  constant 18 degrees C and fluctuating 22 degrees C/14 degrees C on a 12-hour cycle.  A common vapor pressure deficit of 0.62 kilopascal was maintained at all temperatures.  Plants under constant 18 degrees C were stunted and had chlorotic and abscised leaves and essentially no tuber formation.  Plants grown under the fluctuating temperature treatment developed normally, were developing tubers, and had a fivefold or greater total dry weight as compared with those under the constant temperature.  These results suggest that a thermoperiod can allow normal plant growth and tuberization in potato cultivars that are unable to develop effectively under continuous irradiation.

Control of Continuous Irradiation Injury on Potatoes with Daily Temperature Cycling