Photosynthetic Photon Flux, Photoperiod, and Temperature Effects on Emissions of (Z)-3-hexenal, (Z)-3-hexenol, and (Z)-3-hexenyl Acetate from Lettuce

in Journal of the American Society for Horticultural Science
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  • 1 Horticultural Sciences Department, University of Florida, Gainesville, FL 32611
  • | 2 National Aeronautics and Space Administration, Mail Code MD-RES, Kennedy Space Center, FL 32899
  • | 3 U.S. Department of Agriculture, Agricultural Research Service, Gainesville, FL 32604

To investigate the effects of environment on plant volatile emissions, `Waldmann's Green' leaf lettuce was cultivated under different levels of photosynthetic photon flux (PPF), photoperiod, and temperature. A modified growth chamber was used to sample plant volatile emissions nondestructively, over time, and under controlled conditions. Total volatile emission rates were significantly higher from lettuce cultivated under PPF of 360 or 200 μmol·m-2·s-1 compared to 105 μmol·m-2·s-1, and significantly higher under a 16-h photoperiod than an 8-h photoperiod. No differences were detected among emission rates from different temperature treatments. In controlled environments, emissions could be regulated by adjusting environmental conditions accordingly.

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