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Embryo Physiological Responses to Cold by Two Cultivars of Oat during Germination

^a Dep. of Ecology and Evolutionary Biology, Univ. of Connecticut, 75 North Eagleville Road, Storrs, CT 06269-3043 USA
^b Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 2407, Concepción, Chile
^c Instituto de Botánica, Universidad Austral de Chile, Austral, Chile

View larger version (20K): [in a new window]   Fig. 1 Days to the initiation (Di) and to 50% germination (D50) at four temperature regimes. Asterisks indicate significant differences between Ot220 and America oat seeds at P 0.01. Data are mean ± SD of eight replicates of 30 seeds

View larger version (16K): [in a new window]   Fig. 2 Final germination percentage of the two oat cultivars at four temperature regimes. Asterisks indicate significant differences between Ot220 and America cultivars at P 0.05. Data are mean ± SD eight replicates of 30 seeds

View larger version (37K): [in a new window]   Fig. 3 Total oxygen consumption of intact embryos of Ot220 and America grown at 3°C at three stages of development. Error bars are standard deviation. Asterisks indicate significant differences between Ot220 and America at P 0.05

View larger version (45K): [in a new window]   Fig. 4 Relative oxygen consumption as the percentage contribution of cytochrome c oxidase (Cyt c) (15 mM SHAM resistant) and the alternative oxidase (AO) (0.5 mM KCN resistant) pathways of two oat cultivars grown at 3°C at three developmental stages. Error bars are standard deviation of 10 to 15 embryos. Asterisks indicate significant differences between Ot220 and America cultivars at P 0.05