Journal ArticleDOI
Evidence for inhibitor involvement in thermodormancy of Grand Rapids lettuce seeds
TLDR
In this article, the authors investigated the possibility that inhibitors are involved in the induction of thermodormancy of lettuce seeds and concluded that inhibitors were not an osmotic effect.Abstract:
Prolonged imbibition and incubation of lettuce seeds at a supraoptimal temperature induces secondary dormancy. Such seeds no longer germinate when returned to conditions optimal for germination of non-dormant seeds. The possibility that inhibitors are involved in the induction of thermodormancy was investigated.Washing of thermodormant seeds restored germination to a small extent. However, continuous leaching of seeds during high-temperature treatment with distilled water, largely prevented the induction of thermodormancy. Such seeds were qualitatively similar to nondormant seeds, i.e. they required only light to germinate at a lower temperature and germinated in the dark if given GA3. The germination water from thermodormant seeds inhibited the germination of non-dormant lettuce seeds. The inhibition was not an osmotic effect. Absorbance in the ultraviolet region was higher in germination water from thermodormant seeds than that of non-dormant seeds. It is concluded that inhibitors are involved in the induction of thermodormancy of lettuce seeds.read more
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Book
Seed Germination in Desert Plants
TL;DR: The reader is provided with an understanding of the complex influences acting upon each seed, traced from initial development to germination stage, regarding germination preparation and the subsequent survival.
Journal ArticleDOI
Strategies of seed dispersal and germination in plants inhabiting deserts
TL;DR: Each of the plant species studied was found to have its own survival strategies of seed dispersal and germination, which depends on the influences of maternal and environmental factors when the seeds are still on the mother plant, mostly during the final stage of seed maturation.
Journal ArticleDOI
Some reflections on the relationship between endogenous hormones and light-mediated seed dormancy
TL;DR: It is concluded that gibberellins are primarily involved in post-dormancy metabolic processes leading to embryo growth and radicle emergence, such as food reserve mobilisation and endosperm softening.
Journal ArticleDOI
Photoblastism and Ecophysiology of Seed Germination in Weedy Rice
Nam-Jin Chung,Nam-Chon Paek +1 more
TL;DR: The prompt and delayed induction of germination by a pulse of R and FR light, respectively, following dark imbibition suggests that phytochrome B exists in dormant seeds and phy tochrome A is synthesized during dark imbIBition.
References
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Journal ArticleDOI
Secondary dormancy in light-sensitive lettuce seeds incubated anaerobically or at elevated temperature
William Vidaver,Andrew I. Hsiao +1 more
TL;DR: Light-sensitive lettuce seeds become secondarily dormant within 8–10 days if initial germination is suppressed by far-red light or incubation at elevated temperature (≥30 °C).
Journal ArticleDOI
Actions of Gibberellic Acid and Phytochrome on the Germination of Grand Rapids Lettuce Seeds
TL;DR: Gibberellins and red light appear to act on germination by regulation of sequential sites of a branched-looped pathway, and phytochrome-dependent germination seems to require only low levels of endogenous gibbereLLin activity or the addition of gibBerellic acid.
Journal ArticleDOI
Antagonistic effects of high and low temperature pretreatments on the germination and pregermination ethylene synthesis of lettuce seeds.
TL;DR: Evidence presented indicates that the inability of seeds to germinate at supraoptimal temperature is not due either to a rapid loss of far red-absorbing phytochrome or to an inadequate capacity for ethylene synthesis.