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Ethylene Production of Two Wheat Cultivars Exposed to Desiccation, Heat, and Paraquat-Induced Oxidation

^a Texas A&M Univ. System, Texas Agric. Exp. Stn., 6500 Amarillo Blvd. West, Amarillo, TX 79106
^b Dep. of Molecular and Laser Physics, Univ. of Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, the Netherlands

View larger version (25K): [in a new window]   Fig. 1. Effects of cultivar, water regime, and time of observation on the ethylene production rate of wheat seedlings. Means ± SD of three replications are presented. Rectangles at the top of the figure show the well-watered (the first 17 h) and the recovery (the last 17 h), and the line in between shows the desiccation (24 h) regime. Probabilities for cultivar effect and cultivar x hour interaction (in parentheses) are presented at the top of the figure for each water regime. DW = dry weight.

View larger version (20K): [in a new window]   Fig. 2. Effects of cultivar, water regime, and time of observation on the ethylene production rate of wheat seedlings under high air humidity (above) and low air humidity (below). Rectangles at the top of the figure show the well-watered (the first 17 h) and the recovery (the last 25 h), and the line in between shows the desiccation (40 h) regime. Probabilities for cultivar effect and cultivar x hour interaction (in parentheses) are presented at the top of the figure for each water regime. The two levels of humidity were used as blocks (replications). DW = dry weight.

View larger version (18K): [in a new window]   Fig. 3. Primary leaf length of wheat cultivars Delia and Dropia at the beginning of well-watered regime (Start Exp), beginning of desiccation (Start Str), end of desiccation (End Str), and end of recovery (End Exp). Data are based on seedlings from all desiccation experiments. Means ± SD of five replications are presented.

View larger version (22K): [in a new window]   Fig. 4. Effects of cultivar, temperature, and temperature duration on the ethylene production rate in wheat seedlings. Means ± SD of four replications are presented. To make graph easy, only 1/4 of the means have SD shown. Rectangles at the top of the figure show the 38°C and the lines the 22°C temperature regimes. Probabilities for cultivar effect and cultivar x temperature interaction (in parentheses) are presented at the left top of the figure. DW = dry weight.

View larger version (25K): [in a new window]   Fig. 5. Effects of cultivar (Ctr), paraquat-induced oxidation (Pq), and time of observation on the ethylene production rate in wheat seedlings. Means ± SD of two replications are presented. Arrow indicates application of additional light to 400 µmol m–2 s–1 photosynthetic photon flux density. Probabilities for cultivar effect and cultivar x treatment interaction (in parentheses) are presented at the left top of the figure. DW = dry weight.