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Frost tolerance (LT50), apical development (DC = decimal code) and days to heading of ‘Mironovskaya’ (MIR) winter wheat and ‘Leguan’ (LEG) spring wheat plants during 12 weeks of acclimation at 2 °C and two photoperiods, 16 h (long day) or 8 h (short day). Vertical bars indicate LSD0·05 and asterisks indicate that the plants had not reached heading by 100 d.
