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Influence of Vernalization and Photoperiod Responses on Cold Hardiness in Winter Cereals

Crop Development Centre, Univ. of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada

View larger version (102K): [in a new window]   Fig. 3. Apical development of Norstar winter wheat grown at 4°C under SD (8 h) and LD (20 h) photoperiods for 0, 49, and 98 d. Comparative phenological advancement to double ridge formation (LD98) is illustrated.

View larger version (111K): [in a new window]   Fig. 4. Apical development of Kold winter barley grown at 4°C under SD (8 h) and LD (20 h) photoperiods for 0 to 98 d. Comparative phenological advancement to double ridge formation (LD42, SD70) is illustrated.

View larger version (20K): [in a new window]   Fig. 1. Final leaf number (FLN) of Norstar and Warrior winter wheat and Kold winter barley acclimated at 4°C for 0 to 98 d (average of LD (20 h) and SD (8 h) treatments) and then moved to 20°C LD conditions (SE of data points = 0.45). See Table 1 for regression coefficients.

View larger version (17K): [in a new window]   Fig. 2. Average final leaf number (FLN) of Norstar and Warrior winter wheat and Kold winter barley acclimated at 4°C for 0 to 98 d under long (LD = 20 h) and short days (SD = 8 h) and then moved to 20°C LD conditions (SE of data points = 0.35). See Table 1 for regression coefficients.

View larger version (28K): [in a new window]   Fig. 5. Low-temperature tolerance of Norstar and Warrior winter wheat and Kold winter barley acclimated under both long (LD = 20 h) and short (SD = 8 h) d at 4°C for 0 to 98 days (SE of data points = 0.48). See Table 2 for regression coefficients.