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Effects on Net Photosynthesis in Field-Grown Hot Peppers Responding to the Increased CO2 and Temperature
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Effects on Net Photosynthesis in Field-Grown Hot Peppers Responding to the Increased CO2 and Temperature
Yun, Sung-Chul; Ahn, Mun-Il;
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The increased and temperature (700 mol. and ) was compared with ambient growth conditions (400 mol. and ) in hot pepper. Gas exchange measurements, including net photosynthesis () and stomatal conductance (), were taken according to treatment in fields of peppers grown in Suwon and Asan during 2008. The increased treatment by 35-45% throughout the season and was statistically significant in t-tests (p < 0.001); however, it did not significantly affect . In addition, the gas exchange parameters in sun and shade leaves were measured. The difference between the sun and shade leaves was much greater than that between the elevated and ambient treatments, especially at harvest. Four commercial cultivars of hot pepper, Chunhasangsa, Ryukang, Manitta, and Olympic, were also compared by ANOVA. Chunhasangsa had the highest , which decreased by 30% from the vegetative to the harvest stage. Based on a factorial design, the effect of the increased and temperature was assessed based on the temperature, , and their interaction effects. Orthogonal contrasts showed that the effects of temperature on and were significant, whereas and their interactions were not.
doubled ;hot pepper;net photosynthesis;stomatal conductance;shade leaf;
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