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Distribution and Mobilization of Sulfur during Soybean Reproduction

^a Dep. of Agronomy and Plant Genetics, 411 Borlaug Hall, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
^b Dep. of Agronomy, 1563 Agronomy Hall, Iowa State Univ., Ames, IA 50011

View larger version (24K): [in a new window]   Fig. 1. Dry matter and total S accumulation and redistribution in soybean in Exp. 1. (A) Distribution of dry matter; (B) Distribution of total S. Both plots are cumulative, so that the area between the curves represents the plant organ; the top curve within each plot represents the total, whole-plant value. Soybean reproductive stages (R4.0–8.0) are along the bottom of the x axis. All values are means ± SE (n = 4).

View larger version (23K): [in a new window]   Fig. 2. Dry matter and total S accumulation and redistribution in soybean in Exp. 2. (A) Distribution of dry matter; (B) Distribution of total S. All plots are cumulative, so that the area between the curves represents the plant organ; the top curve within each plot represents the total. Soybean vegetative stages (R2.0–8.0) are along the bottom of the x axis. All values are means ± SE (n = 4).

View larger version (42K): [in a new window]   Fig. 3. 35S accumulation and redistribution in soybean plants pulsed at 53 and 79 d after imbibition in Exp. 1. Distribution of 35S components in plants pulsed at 53 DAI (A, C, and E), and in plants pulsed at 79 DAI (B, D, and F). All plots are cumulative, so that the area between the curves represents the plant organ; the top curve within each plot represents the total. Soybean vegetative state (R4.0–8.0) are along the bottom of the x axis. All values are means ± SE (n = 4).

View larger version (42K): [in a new window]   Fig. 4. 35S accumulation and redistribution in soybean plants pulsed at 65 and 98 d after imbibition in Exp. 2. Distribution of 35S components in plants pulsed at 65 DAI (A, C, and E), and in plants pulsed at 98 DAI (B, D, and F). All plots are cumulative, so that the area between the curves represents the plant organ; the top curve within each plot represents the total. Soybean vegetative stages (R4.0–8.0) are along the bottom of the x axis. All values are means ± SE (n = 4).

View larger version (29K): [in a new window]   Fig. 5. Initial (i) and final (f) distribution of 35S acquired by plants over five pulse dates during reproductive growth of soybean. Individual data points represent the fraction of the whole plant 35S by organ. Open symbols represent the fraction of the whole plant 35S content in seeds, pods, and leaves, immediately after a 10-h pulse of 35SO4 by date of pulse administration. Closed symbols represent the distribution of plant 35S in seeds and leaves at maturity, relative to their date of 35S acquisition. Values represent portion of the whole plants' 35S content in leaves, pods, and seeds, and were means ± SE (n = 4 for all pulses except that at DAI 119 [n = 2]).

View larger version (29K): [in a new window]   Fig. 6. 35S content of new and mature leaf fractions. (A) Distribution of 35S components between the mature and expanding leaf fraction (3 open and expanding leaves, and any leaf buds) for plants pulsed at DAI 65 of Exp. 2. (B) Radiosulfur distribution in plants pulsed at DAI 98. Plots are additive, so that the top line represents the total 35S in both leaf fractions. Values represent means ± SE (n = 4). DAI = days after imbibition.