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Weight per Grain, Oil Concentration, and Solar Radiation Intercepted during Grain Filling in Black Hull and Striped Hull Sunflower Hybrids

^a Unidad Integrada Facultad de Ciencias Agrarias (UNMdP), Estación Experimental Agropecuaria INTA Balcarce, C.C. 276, 7620 Balcarce, Argentina
^b Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina)
^c Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba C.C. 509, 5000 Córdoba, Argentina

View larger version (31K): [in this window] [in a new window]   Figure 1. Relative weight per grain (a, b) and relative oil concentration (c, d) as a function of relative intercepted radiation during grain filling for black hull (a, c) and striped hull (b, d) hybrids.

View larger version (28K): [in this window] [in a new window]   Figure 2. Weight per grain as a function of thermal time after flowering in the black hull hybrids G-100 (Exp. D and E) and Dekasol 3881 (Exp. B1), and striped hull hybrids NKT (Exp. D and E) and ACA 884 (Exp. B1). Arrows indicate the time of treatment application (TA). Sh., shaded, Th., thinned, °Cd, degree days.

View larger version (28K): [in this window] [in a new window]   Figure 3. Grain oil concentration as a function of thermal time after flowering in the black hull hybrid G-100 (Exp. D and E) and Dekasol 3881 (Exp. B1), and striped hull hybrids NKT (Exp. D and E) and ACA 884 (Exp. B1). Arrows indicate the time of treatment application (TA). Sh., shaded; Th., thinned; °Cd, degree days.

View larger version (22K): [in this window] [in a new window]   Figure 4. Grain oil concentration as a function of oil concentration in the kernel (a, c), or the proportion of kernel in the grain (b, d) for the Dekasol 3881 (black hull, a and b) and ACA 884 (striped hull, c and d). All results are expressed as the proportion of the maximum value of each variable. Maximum values for oil concentration in the grain are 54.2 and 46.9% for Dekasol 3881 and ACA 884, respectively. Maximum values for oil concentration in the kernel are 67.0 and 69.6% for Dekasol 3881 and ACA 884, respectively. Maximum kernel proportions in the grain are 0.79 and 0.73 for Dekasol 3881 and ACA 884, respectively.