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Water-Stress-Induced Changes in Resin and Rubber Concentration and Distribution in Greenhouse-Grown Guayule

Dep. of Plant Sciences, Univ. of Arizona, Forbes 303, Tucson, AZ 85721

View larger version (16K): [in a new window]   Fig. 1. Mean leaf osmotic potential of well-watered (W) and water-stressed (D) guayule in the summer and winter the day after irrigation. The osmotic potential was measured on 19 plants in each irrigation treatment in summer 2003 (five plants in each of four replications, with one plant missing in one replication), on eight plants in each irrigation treatment in summer 2004 (two plants in each of four replications), on nine plants in each irrigation treatment in winter 2003–2004 (three plants in each of three replications), and on four plants in each irrigation treatment in winter 2004–2005 (one plant in each of four replications). The vertical bar indicates ± standard error.

View larger version (15K): [in a new window]   Fig. 2. Mean midday C exchange rate of well-watered (W) and water-stressed (D) guayule the day before and the day after irrigation in June, July, and August 2003. Carbon exchange measurements were recorded within 1 h of solar noon. Measurements were taken on 19 plants in each irrigation treatment (five plants in each of four replications, with one plant missing in one replication). The vertical bar indicates ± standard error.

View larger version (11K): [in a new window]   Fig. 3. Mean midday C exchange rate of well-watered (W) and water-stressed (D) guayule in December 2003 and January and February 2004, an average of 3 to 4 d after irrigation of the water-stressed plants. Carbon exchange measurements were recorded within 1 h of solar noon. Measurements were taken on 12 plants in each irrigation treatment (three plants in each of four replications). The vertical bar indicates ± standard error.

View larger version (14K): [in a new window]   Fig. 4. Mean diurnal C exchange rates of well-watered (W) and water-stressed (D) guayule in July 2003. Diurnal measurements were taken 2 d after irrigation of the water-stressed plants. Carbon exchange measurements were recorded every 2 h beginning at 0800 and ending at 1600 h. Measurements were taken on 10 plants in each irrigation treatment (five plants in each of two replications). The vertical bar indicates ± standard error.

View larger version (15K): [in a new window]   Fig. 5. Mean diurnal C exchange rates of well-watered (W) and water-stressed (D) guayule in February 2004. Diurnal measurements were taken an average of 4 d after irrigation of the water-stressed plants. Carbon exchange measurements were recorded every 2 h beginning at 0700 and ending at 1700 h. Measurements were taken on eight plants in each irrigation treatment (two plants in each of four replications). The vertical bar indicates ± standard error.