Photosynthetica 2008, 46(4):595-603 | DOI: 10.1007/s11099-008-0100-2

Effect of high temperature on photosynthesis and transpiration of sweet corn (Zea mays L. var. rugosa)

J. Ben-Asher1,*, A. Garcia y Garcia2, G. Hoogenboom2
1 The Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Negev, Israel
2 Department of Biological and Agricultural Engineering, The University of Georgia, Griffin, USA

Four temperature treatments were studied in the climate controlled growth chambers of the Georgia Envirotron: 25/20, 30/25, 35/30, and 40/35 °C during 14/10 h light/dark cycle. For the first growth stage (V3-5), the highest net photosynthetic rate (P N) of sweet corn was found for the lowest temperature of 28-34 µmol m-2 s-1 while the P N for the highest temperature treatment was 50-60 % lower. We detected a gradual decline of about 1 P N unit per 1 °C increase in temperature. Maximum transpiration rate (E) fluctuated between 0.36 and 0.54 mm h-1 (≈5.0-6.5 mm d-1) for the high temperature treatment and the minimum E fluctuated between 0.25 and 0.36 mm h-1 (≈3.5-5.0 mm d-1) for the low temperature treatment. Cumulative CO2 fixation of the 40/35 °C treatment was 33.7 g m-2 d-1 and it increased by about 50 % as temperature declined. The corresponding water use efficiency (WUE) decreased from 14 to 5 g(CO2) kg-1(H2O) for the lowest and highest temperature treatments, respectively. Three main factors affected WUE, P N, and E of Zea: the high temperature which reduced P N, vapor pressure deficit (VPD) that was directly related to E but did not affect P N, and quasi stem conductance (QC) that was directly related to P N but did not affect E. As a result, WUE of the 25/20 °C temperature treatment was almost three times larger than that of 40/35 °C temperature treatment.

Additional key words: maize; quasi stem conductance; transpiration rate; vapor pressure deficit; water use efficiency

Received: April 30, 2008; Published: December 1, 2008  Show citation

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Ben-Asher, J., Garcia y Garcia, A., & Hoogenboom, G. (2008). Effect of high temperature on photosynthesis and transpiration of sweet corn (Zea mays L. var. rugosa). Photosynthetica, 46(4), 595-603. doi: 10.1007/s11099-008-0100-2
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