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Differences in the nature of thermo dormancy and far red dormancy in lettuce lactuca sativa cultivar noran seeds

, : Differences in the nature of thermo dormancy and far red dormancy in lettuce lactuca sativa cultivar noran seeds. Physiologia Plantarum 53(4): 553-557

Lettuce seeds cv. Noran germinate at C in light as well as in darkness. Dormancy can be induced either by a long exposure (24 h) to far-red radiation or by an exposure of 48-72 h to a temperature of C. The difference in response of these 2 types of dormant seeds to conditions inducing germination indicate that in both types Pfr [phytochrome-far red form] is inactivated, but that a dark process required for immediate action of Pfr does not proceed at C as it does during far-red radiation.

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