Journal ArticleDOI
Two sites of hormonal action during germination of Chenopodium album L. seeds
TLDR
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.Abstract:
During the overall germination process in the light-requiring seeds of Chenopodium album L. two sites of hormonal action can be distinguished.
The start of visible growth is induced in darkness by the gibberellins 4 and 7 (GA4+7) or by ethylene. Added cytokinins are inactive although 8-14C-kinetin shows rapid penetration into the seed and rapid turnover. The induction of growth by GA4+7 and the uptake of 8-methylene-14C-GA3 are enhanced at lower pH values. Prolonged incubation in darkness results in a decreased responsiveness of the seeds towards GA4+7 and ethylene.
A second site of hormonal action is located during the progress of growth inside the covering structures. ABA inhibits radicle growth, while GA4+7, GA3, kinetin, zeatin and ethylene reduce the inhibition.read more
Citations
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Journal ArticleDOI
The Annual Dormancy Cycle in Buried Weed Seeds: A Continuum
Jerry M. Baskin,Carol C. Baskin +1 more
TL;DR: Researchers have known for decades that many buried seeds need to be brought to the soil surface before they will germinate, and to understand how germination of buried seeds is controlled, plant biologists have studied the re.
Journal ArticleDOI
Key Role for Endogenous Gibberellins in the Control of Seed Germination
Journal ArticleDOI
Ethylene, a key factor in the regulation of seed dormancy.
TL;DR: The responsiveness of seeds to ethylene will be described, and the key role of ethylene in the regulation of seed dormancy via a crosstalk between hormones and other signals will be discussed.
Journal ArticleDOI
Ethylene in seed dormancy and germination
Jan KeÇpczyński,Ewa KeÇpczyńska +1 more
TL;DR: The evidence presented here shows that ethylene performs a relatively vital role in dormancy release and seed germination of most plant species studied.
Journal ArticleDOI
Ethylene in seed formation and germination
TL;DR: The biological models and approaches that may shed additional light on the role of ethylene during seed germination are presented.
References
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Journal ArticleDOI
Action of kinetin on photosensitive germination of lettuce seed as compared with that of gibberellic acid
Hiroshi Ikuma,Kenneth V. Thimann +1 more
Journal ArticleDOI
Inhibition of Gibberellic Acid-induced Germination by Abscisic Acid and Reversal by Cytokinins.
TL;DR: This communication will show that the induced process, namely dark germination of Grand Rapids lettuce seed, is inhibited by abscisic acid and is reversed by the cvtokinin, kinetin but not by excess GA3.
Journal ArticleDOI
Phytochrome and hormonal control of expansion and greening of etiolated wheat leaves
TL;DR: Pre-treatment with ABA inhibits the increase in gibberellin levels in response to red light, but the ihibitory effect of ABA on unrolling cannot be ascribed only to its effect on gibBerellic acid levels.
Journal ArticleDOI
Abscisin II and , some. Hormone-Regulated Plant Responses
D Aspinall,LG Paleg,FT Addicott +2 more
TL;DR: The aotivity of (±)-absoisin II' [(±)AbII] and its interaction with a number of plant growth regulators in the oontrol of lettuce germination, lettuoe hypoootyl and radiole elongation, ououmber seedling growth, radish lea ( senesoenoe, and barley vernalization were examined.