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Coreopsis  and  Gaillardia  were exposed to supra-optimal temperatures of 35 °C for a 6-week period beginning at flower initiation. Photosynthesis measurements were recorded at 1100  hr , 1300  hr , and 1500  hr  for 3 days each week and carbohydrate partitioning was determined once per week. Results indicate that the time of day the measurements were taken made little difference on rate of photosynthesis and that there was a similar trend in photosynthetic rate over the 6-week period. Photosynthesis decreased as the plants began to flower and then increased until the onset of flower senescence. The patterns of carbohydrate partitioning were similar to those observed for photosynthesis. The plants grown at supra-optimal and optimal conditions had a similar trend and rate of photosynthesis throughout the 6-week period. Plant growth and total carbohydrates significantly decreased as the duration of high temperature increased for both species, however  Gaillardia  was more heat tolerant than  Coreopsis .

hortscience

151 The Effect of Supro-optimal Temperature on Photosynthesis, Carbohydrate Allocation, Flowering, and Growth of Coreopsis grandiflora `Sunray' AND Gaillardia × grandiflora `Goblin'