Differences in the nature of thermodormancy and far-red dormancy in lettuce seeds |
| |
Authors: | G Blaauw-Jansen |
| |
Institution: | Botanical Institute, University of Utrecht, Lange Nieuwstraat 106, 3512 PN Utrecht, The Netherlands. |
| |
Abstract: | 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 Pfr is inactivated, but that a dark process required for immediate action of Pfr does not proceed at 37°C as it does during far-red radiation. |
| |
Keywords: | Seed germination Dormancy Lettuce Phytochrome |
|
|