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Effects of Planting Date, Genotype, and Their Interactions on Sunflower Yield

II. Components of Oil Yield

IFEVA, Facultad de Agronoma, Universidad de Buenos Aires/CONICET, Av. San Martn 4453, (1417) Buenos Aires, Argentina

View larger version (16K): [in a new window]   Fig. 1. Relationships between oil yield and (A) grain number per square meter, (B) grain weight, and (C) grain oil concentration, for nine sunflower hybrids grown in October (S1) and December (S2) sowing dates at Venado Tuerto during 1996-1997 and 1998-1999. Values are means of the 2 yr. Dashed arrows highlight some contrasting genotypic responses to change from S1 to S2, and which underlie G x S interactions (Treatment 1, triangles; Treatment 9, circles). Genotype groups derived from cluster analysis of a multienvironment trial (de la Vega et al., 2001), i.e., G1: Northern adapted, G2: Central adapted, G3: broadly adapted. See Table 1 in de la Vega and Hall (2002) for genotype group membership.

View larger version (18K): [in a new window]   Fig. 2. Relationships between grain weight and (A) rate of grain filling, and (B) duration of grain filling, for nine sunflower hybrids grown in October (S1) and December (S2) sowing dates at Venado Tuerto during 1996-1997 and 1998-1999. For genotype groups (i.e., G1, G2, G3) see legend of Fig. 1.

View larger version (20K): [in a new window]   Fig. 3. Bilineal relationships between grain weight and time from full anthesis for Genotypes 1, 2, and 9 in October (S1) and December (S2) planting dates at Venado Tuerto, 1996-1997. Final grain weight and grain oil concentration values reached by those hybrids in those environments are superimposed. Error bars indicate standard deviations. See Table 1 for the genotype codes.

View larger version (23K): [in a new window]   Fig. 4. Relationships between grain oil concentration and (A) kernel percentage, and (B) duration of grain filling, for nine sunflower hybrids grown in October (S1) and December (S2) sowing dates at Venado Tuerto during 1996-1997 and 1998-1999. Dashed arrows highlight some contrasting genotypic responses to S2, which underlie G x S interactions (Treatment 1, Triangles; Treatment 9, circles). For genotype groups (i.e., G1, G2, G3) see legend of Fig. 1.