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temperatures for pepper photosynthesis range from 25 to 35 °C, and temperatures outside this range can limit the yield; for example, C . chinense flower abortion increased 2-fold and fruit set decreased 3-fold when greenhouse temperatures were increased from

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The short-term effects of photosynthetic photon flux (PPF), day/night temperatures and CO2 concentration on CO2 exchange were determined for two Phalaenopsis hybrids. At 20 °C, the saturating PPF for photosynthesis was 180 μmol·m-2s-1. At this PPF and ambient CO2 level (380 μL·L-1), a day/night temperature of 20/15 °C resulted in the largest daily CO2 uptake. Higher night temperatures probably increased the respiration rate and lowered daily CO2 uptake in comparison with 20/15 °C. An increase in the CO2 concentration from 380 to 950 μL·L-1 increased daily CO2 uptake by 82%.

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179 ORAL SESSION (Abstr. 715-722) CROSS-COMMODITY PHOTOSYNTHESIS

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179 ORAL SESSION (Abstr. 715-722) CROSS-COMMODITY PHOTOSYNTHESIS

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The ultraviolet radiation B region (UV-B, 280–315 nm) is critical for plant growth and development, morphogenesis, adaptive orientation, photosynthesis, and secondary metabolism ( Krizek, 2004 ; Rozema et al., 1997 ; Teramura, 1983 ). In recent

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We thank Alexandra Rosati and Jonathan Guan from the NSF Young Scholars Program for carrying out stem water potential measurements and preliminary photosynthesis measurements, respectively. We thank Drs. Loren Oki and Mark Roh for helpful comments

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chlorophyll fluorometer and growth chambers and Kassim Al-Khatib for the use of photosynthesis measurement system. Mention of a trademark does not imply endorsement of the product.

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57 ORAL SESSION 17 (Abstr. 116-123) Tree Fruit and Berries: Gas Exchange/Photosynthesis

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