Endosperm and pericarp involvement in the supercooling of imbibed lettuce seeds |
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Authors: | Bourque J E Wallner S J |
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Institution: | Department of Horticulture, Colorado State University, Fort Collins, Colorado 80523. |
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Abstract: | Fully hydrated lettuce (Lactuca sativa L.) seeds showed dual freezing exotherms (−9 and −18°C), even after 10 hours imbibition. Only the −9°C exotherm was observed in seeds imbibed for 20 hours, but without external nucleation, all water in the embryo supercooled. Results indicate that the endosperm acts as a barrier to ice propagation. Other experiments suggest that the pericarp may also protect the embryo under certain freezing conditions. |
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