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Sensitivity of Wheat and Rice to Low Levels of Atmospheric Ethylene

Crop Physiology Laboratory, Dep. of Plants, Soils and Biometeorology, Utah State Univ., Logan, UT 84322-4820

View larger version (35K): [in a new window]   Fig. 1. Diagram of one of six cylindrical chambers in the growth chamber system.

View larger version (47K): [in a new window]   Fig. 2. Diagram of one of 12 rectangular chambers in the greenhouse system. Two cultivars were grown within each chamber.

View larger version (142K): [in a new window]   Fig. 3. Picture of the 12-chamber greenhouse system.

View larger version (31K): [in a new window]   Fig. 4. Ethylene response curves for yield components of USU-Apogee wheat grown at different photosynthetic photon fluxes (PPF). The short-term exposure pre-anthesis treatment is represented by a triangle.

View larger version (17K): [in a new window]   Fig. 5. Ethylene response curves for yield components of Super Dwarf rice. Data for the short-term exposure, pre-anthesis treatment is not included since this treatment failed to reach maturity.

View larger version (25K): [in a new window]   Fig. 6. Mean yield and harvest index (HI) of USU-Apogee and Super Dwarf wheat with and without 50 nmol mol-1 C2H4 at three levels of CO2. Yields are normalized to percent of the control at 1200 µmol mol-1 CO2 for ease of comparison. HI was calculated assuming the root mass to be 10% of the total above ground biomass.