Antifreeze protein accumulation in freezing-tolerant cereals

Freezing-tolerant plants withstand extracellular ice formation at subzero temperatures. Previous studies have shown that winter rye (Secale cereale L.) accumulates proteins in the leaf apoplast during cold acclimation that have antifreeze properties and are similar to pathogenesis-related proteins. To determine whether the accumulation of these antifreeze proteins is common among herbaceous plants, we assayed antifreeze activity and total protein content in leaf apoplastic extracts from a number of species grown at low temperature, including both monocotyledons (winter and spring rye, winter and spring wheat, winter barley, spring oats, maize) and dicotyledons (spinach, winter and spring oilseed rape [canola], kale, tobacco). Apoplastic polypeptides were also separated by SDS-PAGE and immunoblotted to determine whether plants generally respond to low temperature by accumulating pathogenesis-related proteins. Our results showed that significant levels of antifreeze activity were present only in the apoplast of freezing-tolerant monocotyledons after cold acclimation at 5/2°C. Moreover, only a closely related group of plants, rye, wheat and barley, accumulated antifreeze proteins similar to pathogenesis-related proteins during cold acclimation. The results indicate that the accumulation of antifreeze proteins is a specific response that may be important in the freezing tolerance of some plants, rather than a general response of all plants to low temperature stress.

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