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Photoperiod and Temperature Responses in Early-Maturing, Near-Isogenic Soybean Lines

Eastern Cereal and Oilseed Research Centre (ECORC), Agric. & Agri-Food Canada, Ottawa, Ontario, Canada, K1A 0C6

View larger version (11K): [in a new window]   Fig. 1. Sensitivity study on the critical photoperiod (PC) above which photoperiod extends the time to first flower. The standard error of estimate (SEE) of the model (Eq. [7]) fit to the data is plotted against PC. The solid line is Y = 51.41 - 7.128X + 0.2642X2 with a minimum at 13.5 h (R2 = 0.98).

View larger version (22K): [in a new window]   Fig. 2. Days to first flower as a function of photoperiod at two temperatures (28 and 18°C) for five photoperiods and six isolines of soybean. Lines are model calculations. Error bars are standard errors of the mean. Photoperiods were 10, 12, 14, 16 and 20 h but some data are offset by plus or minus 0.2 h for clarity.

View larger version (16K): [in a new window]   Fig. 3. Observed versus calculated days to first flower. The solid line is the 1:1 line and the broken line is the regression, Y = 2.018 + 0.9542X with an r2 of 0.96.

View larger version (25K): [in a new window]   Fig. 4. The photoperiod-temperature interaction function (cT) as it varies with temperature for the six isolines.

View larger version (13K): [in a new window]   Fig. 5. Photoperiod sensitivities determined by the values of the photoperiod coefficients (c), as a function of the number of dominant alleles. The regression (solid line) is Y = -0.002138 - 0.0008123X with an r2 of 0.90.