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Phenological Characterization of Near-Isogenic Sunflower Families Bearing Two QTLs for Photoperiodic Response

^a Unidad Integrada INTA Balcarce, Facultad de Ciencias Agrarias UNMP, Ruta 226 Km 73.5 (7620) Balcarce, Buenos Aires, Argentina
^b Advanta Semillas SAIC Ruta 226 Km 60.5 (7620) Balcarce, Buenos Aires, Argentina
^c IFEVA, Facultad de Agronomía, Univ. de Buenos Aires/CONICET, Av. San Martín 4453 (1417), Buenos Aires, Argentina

View larger version (32K): [in this window] [in a new window]   Figure 1. Relationship between floral stage and days after emergence for the near-isogenic families AHBH, AHBZ, AZBH, and AZBZ, and for sunflower parental lines HA89 and ZENB8 grown under extended (triangles) and short (circles) photoperiods. Each point indicates an individual observation. Floral stages are from Marc and Palmer (1981). Continuous (short photoperiod) and dashed (extended photoperiod) lines are fitted linear regressions. Upper and lower panels are from replicate experiments.

View larger version (8K): [in this window] [in a new window]   Figure 2. Timing of apex differentiation (B0) expressed in days after emergence as a function of allele constitution at quantitative trait loci (QTLs) A and B under short (continuous line) and extended (dashed line) photoperiods. Data points indicate values for each replicate experiment. AHBH and AZBZ include data from HA89 and ZenB8, respectively, because of similar allele constitution at QTLs A and B.

View larger version (8K): [in this window] [in a new window]   Figure 3. Slope of the relationship between days after emergence and floral stage (B1) as a function of allele constitution at quantitative trait loci (QTLs) A and B under short (continuous line) and long (dashed line) photoperiods. Data points indicate values for each replicate experiment. AHBH and AZBZ include data from HA89 and ZenB8, respectively, because of similar allele constitution at QTLs A and B.