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Short Periods of Water Stress during Seed Filling, Leaf Senescence, and Yield of Soybean

^a Dep. of Agronomy, Universidad Nacional del Sur, 8000, Bahia Blanca, Argentina
^b Dep. of Agronomy, University of Kentucky, Lexington, KY 40546-0091

View larger version (29K): [in a new window]   Fig. 1. Effect of water stress on carbon exchange rate (CER) during seed filling. Stress was applied early in seed filling at the beginning of growth stage R6. The time of application of the stress-relief treatments is shown on the x axis by S1 (early) and S2 (late). Bars represent ± one standard error of the mean. Some error bars were omitted to avoid excessive clutter.

View larger version (26K): [in a new window]   Fig. 2. Effect of water stress on leaf N and chlorophyll levels during seed filling, Exp. 1. Stress was applied early in seed filling at the beginning of growth stage R6. The time of application of the early stress-relief treatment is shown on the x axis by S1. The late stress-relief treatment had minimal effects on leaf N and chlorophyll levels and the data are not included. Treatments had no significant (P = 0.05) effect on leaf N levels at growth stage R7 (mean = 0.88 g m-2), but chlorophyll levels of the stressed treatments (180 g m-2) were significantly (P = 0.05) less than the control (230 g m-2). Means with asterisks are significantly (P = 0.05) lower than the control.

View larger version (23K): [in a new window]   Fig. 3. Effect of water stress on leaf area, and leaf N and chlorophyll levels during seed filling, Exp. 2. Stress was applied early in seed filling at the beginning of growth stage R6. The time of application of the stress-relief treatments is shown on the x axis by S1 (early) and S2 (late). Means with asterisks are significantly (P = 0.05) lower than the control.

View larger version (23K): [in a new window]   Fig. 4. Effect of water stress on leaf starch levels during seed filling. Stress was applied early in seed filling at the beginning of growth stage R6. The time of application of the stress relief treatments is shown on the x axis by S1 (early) and S2 (late). The final sample in Exp. 1 was taken when each treatment reached physiological maturity (growth stage R7, Fehr and Caviness, 1977) and they are grouped together disregarding the time scale on the x axis. Means with asterisks are significantly (P = 0.05) lower than the control.