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Sunflower Seed Weight and Oil Concentration under Different Post-Flowering Source-Sink Ratios

Dep. de Producción Vegetal, Fac. de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, Ciudad de Buenos Aires (C1417DSE), Argentina

View larger version (31K): [in a new window]   Fig. 1. Evolution of seed weight and seed oil concentration (oil concentration) of intermediate achenes, of hybrids DK3900 (A) and Paraiso 20 (B) cultivated at two plant population densities. Lines indicate the models fitted to the data. For DK3900: Seed weight = 9.8 + 0.067 thermal time (r2 = 0.97, n = 8, P < 0.001), for thermal time < 657°Cd; Seed weight = 53.6 mg, for thermal time 657°Cd (at 3 plants m–2); Seed weight = 6 + 0.042 thermal time (r2 = 0.76, n = 20, P < 0.001), for thermal time < 796°Cd; Seed weight = 39.8 mg, for thermal time 796°Cd (at 6 plants m–2); Oil concentration = –40 + 1.017 thermal time (r2 = 0.96, n = 18, P < 0.001), for thermal time < 569°Cd; Oil concentration = 539 mg g–1, for thermal time 569°Cd (at 3, 6 plants m–2). For Paraiso 20: Seed weight = 9.8 + 0.068 thermal time (r2 = 0.98, n = 8, P < 0.001), for thermal time < 737°Cd; Seed weight = 60.1 mg, for thermal time 737°Cd (at 3 plants m–2); Seed weight = 1.2 + 0.054 thermal time (r2 = 0.93, n = 20, P < 0.001), for thermal time < 755°Cd; Seed weight = 41.9 mg, for thermal time 755°Cd (at 6 plants m–2); Oil concentration = 8 + 1.03 thermal time (r2 = 0.95, n = 17, P < 0.001), for thermal time < 524°Cd; Oil concentration = 548 mg g–1, for thermal time 524°Cd (at 3, 6 plants m–2).

View larger version (23K): [in a new window]   Fig. 2. Oil yield per unit land area as a function of seed number per unit land area. The three dashed lines show oil yield of seeds weighing 65, 50, and 35 mg assuming a seed oil concentration of 530 mg g–1. The solid line indicates the model fitted to the data.

View larger version (27K): [in a new window]   Fig. 3. Seed number per square meter (A) and leaf area index duration (B) as a function of green leaf area index at flowering. Data points represent values obtained in each experimental plot. Solid lines indicate the models fitted to the data.

View larger version (28K): [in a new window]   Fig. 4. Seed weight (A) and oil weight per seed (B) as a function of leaf area index duration. Data points represent values obtained in each experimental plot. Solid lines indicate the models fitted to the data. RMSE = root mean square error of the models.

View larger version (28K): [in a new window]   Fig. 5. Seed weight (A) and oil weight per seed (B) as a function of post-flowering source–sink ratio (leaf area index duration per seed). Data points represent values obtained in each experimental plot. Solid lines indicate the models fitted to the data. RMSE = root mean square error of the models.

View larger version (32K): [in a new window]   Fig. 6. Relative seed weight (A) and relative seed oil concentration (B) as functions of relative post-flowering source–sink ratio in a number of experiments. The dashed lines show the theoretical slopes of 1 (full source limitation), and the horizontal dotted lines the slope of 0 (full sink limitation). The solid line in panel A indicates the model fitted to the data. RMSE = root mean square error of the model. Descriptions of experimental conditions of each data set are summarized in Table 1. Previously unpublished data sets Perez Alisedo and Ruiz, 1993; Dedominici and Ruiz, 2000.