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Improving Physiological Assumptions Of Simulation Models By Using Gene-Based Approaches

^a Dep. of Biol. and Agric. Eng., The Univ. of Georgia, Griffin, GA 30223-1797
^b Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT, Int.), Apt. Postal 6-41, 06600, Mexico, D.F., Mexico

View larger version (15K): [in a new window]   Fig. 1. Variation in the baseline photoperiod modifier (PHOTPC) as a function of daylength for a critical short day of 12.26 h and a critical long day of 16.88 h.

View larger version (14K): [in a new window]   Fig. 2. Variation in the temperature modifier (TSPPR) as a function of daily minimum temperature.

View larger version (26K): [in a new window]   Fig. 3. Relation between relative response to photoperiod evaluated at Palmira and Popayan using different sets of diverse germplasm of common bean (after Acosta-Gallegos and White, 1995).

View larger version (47K): [in a new window]   Fig. 4. Sensitivity analysis showing variation in simulated days to flower in relation to mean temperature for (A) a photoperiod-sensitive but temperature-insensitive genotype (Ppd Ppd Hr Hr Tip Tip) grown at four latitudes; (B) a photoperiod- and temperature-sensitive genotype (Ppd Ppd Hr Hr tip tip) grown at four latitudes; and (C) photoperiod- and temperature-sensitive (Ppd Ppd Hr Hr tip tip), photoperiod-sensitive but temperature-insensitive (Ppd Ppd Hr Hr Tip Tip), or day-neutral genotypes (ppd ppd -- --) grown at 0° latitude (short day) or 45° north latitude (long day) environment (not all combinations are shown).