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Modeling Genetic Effects on the Photothermal Response of Soybean Phenological Development

^a Eastern Cereal and Oilseed Res. Cent. (ECORC), Agric. and Agri-Food Can., Ottawa, ON, Canada K1A 0C6
^b Univ. of Illinois, Urbana, IL 61801

View larger version (20K): [in a new window]   Fig. 1. Comparison of observed and calculated days to first flower for natural and artificial light. Observations were averaged over replications. Each point represents one isoline-location-year. Calculations are based on the isoline-based model (Eq. [1] through [6]) with (a) using the original model by Cober et al. (2001), (b) the original model modified by inserting the photoperiod limit (PM), and (c) the original model modified with PM plus two sets of photoperiod coefficients.

View larger version (25K): [in a new window]   Fig. 2. Comparison of observed and calculated days to first flower for natural light for soybean isolines in a Clark or Harosoy background. Observations were averaged over replications. Each point represents one isoline-location-year. Calculations are based on the isoline-based model (Eq. [1] through [6]).

View larger version (16K): [in a new window]   Fig. 3. Photoperiod coefficient (°C h-1) for natural daylength (CN) as related to the number of loci with dominant alleles. Genotypes for each isoline are shown in Table 1.

View larger version (18K): [in a new window]   Fig. 4. Comparison of values of the photoperiod coefficient (°C h-1) for natural daylength (CN) calculated as individual values for each isoline and by using the allele-based model (Eq. [7]).

View larger version (25K): [in a new window]   Fig. 5. Comparison of observed and calculated days to first flower. Calculations were made using the allele-based model (Eq. [7]) to calculate the photoperiod coefficient.