Growth analyses of eleven potato cultivars grown in the greenhouse under long photoperiods with and without heat stress |
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| Authors: | Mohamed Ben Khedher Elmer E Ewing |
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| Institution: | 1. Ecole Supérieure d’Horticulture, 4042, Chott-Mariem, Sousse, Tunisia
2. Department of Vegetable Crops, Cornell University, 14853, Ithaca, New York
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| Abstract: | Six potato cultivars from North America were grown in two greenhouses under 18-h photoperiods. All plants were started in a greenhouse that was well ventilated and maintained as close as possible to summer ambient temperatures. One month after planting, half the plants of each cultivar were moved to a greenhouse that was kept at 30 C during the night and was allowed to reach 40 C or higher during the day. Plants from each treatment were harvested at monthly intervals for growth analyses. Concurrently, five clones considered to be heat tolerant were subjected to a similar test in a second experiment. In response to high temperatures, plants in both experiments were taller with smaller leaves, lower tuber yields, higher ratios of stem to leaf dry matter, and lower ratios of tuber to leaf and to stem dry matter. Tubers were lower in percent dry matter, maturity was delayed, and cuttings developed fewer tubers. Cultivars differed greatly in the degree to which they were affected by the heat. In the first experiment, Norchip had outstanding heat tolerance. LT-2 was the most tolerant of the clones in the second experiment. For the cooler treatment the best performance in either experiment was from two clones originally selected in the lowland tropics. |
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