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Shading and Thinning Effects on Seed and Shoot Dry Matter Increase in Determinate Soybean during the Seed-Filling Period

Faculty of Life and Environ. Sci., Shimane Univ., 1060 Nishikawatsu-cho, Matsue 690-8504, Japan

View larger version (17K): [in a new window]   Fig. 1. Schematic relations between shoot and seed dry matter increase (RS/W) during the seed-filling period (SFP). Case 1 is the situation observed in cereal crops. In Case 1, potential seed dry matter increase (S) does not change during SFP, but in Cases 2, 3, and 4, it is affected by shoot dry matter increase (W). In Case 2, the line S = W indicates that almost all of the current assimilate products during the SFP are used for S. When RS/W is above the S = W line, reserved assimilates in the stem supplement S (Case 3). If RS/W is below the S = W line, part of the W accumulates in the vegetative organs (Case 4).

View larger version (18K): [in a new window]   Fig. 2. The relationship between seed and shoot dry matter increase (S and W, respectively) during the seed-filling period when shading or thinning was performed on standard-density plants (11.1 plants m–2) in (a) 1999 and (b) 2000 and low-density plants (5.6 plants m–2) in (c) 2000.

View larger version (17K): [in a new window]   Fig. 3. Relationships between seed dry matter increase (S) and the total pod number on the standard-density plants in (a) 1999 and (b) 2000 and low-density plants in (c) 2000. Symbols are as in Fig. 2.

View larger version (17K): [in a new window]   Fig. 4. Relationships between W during the seed-filling period and total pod number in standard-density plants in (a) 1999 and (b) 2000 and low-density plants in (c) 2000. Symbols are as in Fig. 2.

View larger version (31K): [in a new window]   Fig. 5. Relationships between shoot dry matter increase (W) during the seed-filling period (SFP) and main-stem node number (solid square), total node number (solid diamond), filled pod number at maturity (solid circle), total flower number (solid triangle), and podding rate (filled pod number/flower number; open circle) when standard-density plants were subjected to several shading and thinning conditions during the SFP in 1999. Data are the means ± the standard error of three replications.

View larger version (21K): [in a new window]   Fig. 6. Relationships between seed dry matter increase (S) and shoot dry weight at maturity on standard-density plants in (a) 1999 and (b) 2000 and low-density plants in (c) 2000. The slope of the regression reflects harvest index. Symbols are as in Fig. 2.

View larger version (15K): [in a new window]   Fig. 7. Relationships between ratios of shoot dry matter at the early flowering stage (R2) and maturity (R8) (WR2/R8) and the harvest index of standard-density plants in (a) 1999 and (b) 2000 and low-density plants in (c) 2000. Symbols are as in Fig. 2.