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A Generalized Vernalization Response Function for Winter Wheat

^a School of Nat. Resour. Sci., Univ. of Nebraska, Lincoln, NE 68583-0728
^b Dep. of Agron. and Hortic., Univ. of Nebraska, Lincoln, NE 68586-0915

View larger version (32K): [in a new window]   Fig. 1. Responses of the Morgan–Mercer–Flodin function (Eq. [1]) for differing values of the shape coefficient (n) with a = 0 (intercept), b = 1 (asymptote), and X0.5 = 22.5 (half of the maximum response).

View larger version (23K): [in a new window]   Fig. 2. The vernalization responses of the Morgan–Mercer–Flodin function (Eq. [2]) and the three-stage linear functions (linear function) used by Xue (2000), based on Wang and Engel (1998), for two winter wheat cultivars, Arapahoe and Karl 92. Observed data are from a controlled growth chamber experiment and represent the fraction of full vernalization: 0 = unvernalized plants and 1 = fully vernalized plants. VD, effective vernalization days.

View larger version (20K): [in a new window]   Fig. 3. The vernalization responses of 12 winter wheat cultivars from 19 trials, and the f(V) predicted by the Morgan–Mercer–Flodin function (Eq. [2]). The sources of the observed data are in Table 1, and each point represents the fraction of full vernalization: 0 = unvernalized plants and 1 = fully vernalized plants. LN is the leaf number of plants at the onset of the vernalization treatment for cultivar Pioneer 2548. • = Pioneer 2548 - LN = 1, = Pioneer 2548 - LN = 2, = Pioneer 2548 - LN = 3, = Pioneer 2548 - LN = 4, = Pioneer 2548 - LN = 5, = Pioneer 2548 - LN = 6, = Arapahoe, = Karl 92, x = Osprey (T = 3°C), * = Osprey (T = 5°C), • = Hume, = Norstar, = Augusta, = Bezostaja, = Frederick, = Cheyenne, = Winalta, = Cappelle (Fowler et al., 1996), x = Cappelle (Brooking, 1996). VD, effective vernalization days.