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Differences in the nature of thermodormancy and far‐red dormancy in lettuce seeds
Author(s) -
BlaauwJansen G.
Publication year - 1981
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1981.tb02750.x
Subject(s) - germination , dormancy , darkness , far red , phytochrome , red light , biology , botany , horticulture
Lettuce seeds cv. Noran germinate at 23°C in light as well as in darkness. However 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 37°C. The difference in response of these two types of dormant seeds to conditions inducing germination indicate that in both types P fr is inactivated, but that a dark process required for immediate action of P fr does not proceed at 37°C as it does during far‐red radiation.