Abstract
Changes in frost resistance and contents of total carbohydrate, free proline and soluble protein in response to cold were studied in two winter cultivars of Avena sativa (cvs América and OT 220 × Omihi) with different survival capacities under field conditions. Changes in polar lipids and their constituent fatty acids were studied in cv OT 220 × Omihi. The lowest frost resistance was found in cv América, as observed in the field. Both cultivars increased their frost resistance and total carbohydrates, free proline and soluble proteins during cold acclimation. Some polar lipids (monogalactosyldiacylglycerols, digalactosyldiacylglycerols and phosphatidylinositol) increased after low temperature conditions in the more frost resistant cultivar. Unsaturated fatty acids (linoleic and linolenic) increased in some lipid fractions in cold acclimated cv OT 220 × Omihi. Genetic variability between the two cultivars and possible frost resistance mechanisms are discussed.
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