Actions of Gibberellic Acid and Phytochrome on the Germination of Grand Rapids Lettuce Seeds
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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.Abstract:
Red light and gibberellic acid were about equally effective in promoting germination of Grand Rapids lettuce (Lactuca sativa L.) seeds. With initial far red light treatment more than 80% remained dormant in subsequent dark storage. After 2 days of dark storage, red light effectively promoted germination, while gibberellic acid action was weak. With between 2 and 10 days of dark storage, gibberellic acid had little effect, while promotion by red light decreased slowly and finally disappeared. After 10 days of dark storage, both gibberellic acid and red light were required for germination. The dark storage treatment interferes with phytochrome-independent germination processes and cannot be overcome by added gibberellic acid. However, storage may also decrease the effectiveness of endogenous gibberellins. Phytochrome-dependent germination seems to require only low levels of endogenous gibberellin activity or the addition of gibberellic acid. Gibberellins and red light appear to act on germination by regulation of sequential sites of a branched-looped pathway.read more
Citations
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Journal ArticleDOI
Abscisic acid in the thermoinhibition of lettuce seed germination and enhancement of its catabolism by gibberellin
Takeru Gonai,Shusuke Kawahara,Makoto Tougou,Shigeru Satoh,Teruyoshi Hashiba,Nobuhiro Hirai,Hiroshi Kawaide,Yuji Kamiya,Toshihito Yoshioka +8 more
TL;DR: It is concluded that ABA is an important factor in the regulation of thermoinhibition of lettuce seed germination, and that GA affects the temperature responsiveness of the seeds through ABA metabolism.
Journal ArticleDOI
Dormancy in Seeds
Taylorson R B,Hendricks S B +1 more
TL;DR: The structure and Organization of DormancY and its applications are described in detail in this monograph, which aims to clarify the role of language and semantics in the development of management practices.
Journal ArticleDOI
Environmental conditions and endogenous mechanisms involved in secondary dormancy of seeds
TL;DR: Under field conditions secondary dormancy is part of cyclic changes in the level of dormancy that often follow a seasonal pattern, and develops when germination is inhibited, e.g. by burial in soil.
Book ChapterDOI
Light Control of Seed Germination
B. Frankland,R. Taylorson +1 more
TL;DR: Seed germination in many plant species is influenced by light, and the effects of light and inhibitory effects were first documented in the second half of the 19th century.
Journal ArticleDOI
Two sites of hormonal action during germination of Chenopodium album L. seeds
TL;DR: During the overall germination process in the light-requiring seeds of Chenopodium album L, two sites of hormonal action can be distinguished and a second site oformonal action is located during the progress of growth inside the covering structures.
References
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Book
The germination of seeds
TL;DR: In his Friday evening discourse at the Royal Institution on November 3, Sir Arthur Hill discussed the many ingenious devices for the protection of the seed and equally ingenious arrangements for the escape of the embryo on germination, which are found in plants.
Journal ArticleDOI
Red Light Induction of Gibberellin Synthesis in Leaves
TL;DR: In this article, it was shown that phytochrome in the Pfr form initiates synthesis, or at least brings about increases in the content of gibberellin in plants and seeds.
Journal ArticleDOI
Action of Gibberellic Acid on Lettuce Seed Germination
Hiroshi Ikuma,Kenneth V. Thimann +1 more
TL;DR: The following experiments are an attempt to provide answers to questions as to the mechanism of light-controlled germination of seeds which ordinarily require light.
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