scispace - formally typeset
Search or ask a question
Topic

Gibberellic acid

About: Gibberellic acid is a research topic. Over the lifetime, 6597 publications have been published within this topic receiving 109294 citations. The topic is also known as: GIBBERELLIN A3.


Papers
More filters
Journal ArticleDOI
TL;DR: Grafting experiments indicated that endogenous root factors have no essential role in the lateral branching of the genotypes investigated and the control of axillary bud differentiation and the branching pattern in the to-2 appears to be dependent of a complex mechanism involving gibberellins and cytokinins.
Abstract: The torosa-2 tomato mutant is characterized by a strong inhibition of release of axillary shoots, that is not under the control of the main apex and IAA. Microscopic examination indicated that about 70% of leaf axils do not have axillary buds. Of the growth regulators tested, gibberellic acid and cytokinins were able to modify the to-2 phenotype: increasing bud number (GA3 treated) and developing shoots (both substances). Sequential application of growth regulators demonstrated that bud production was only affected by treatments given between sowing time and 32 days after germination. Grafting experiments indicated that endogenous root factors have no essential role in the lateral branching of the genotypes investigated. The control of axillary bud differentiation and the branching pattern in the to-2 appears to be dependent of a complex mechanism involving gibberellins and cytokinins.

36 citations

Journal ArticleDOI
TL;DR: Gibberellic acid (GA 3 ) treatments (30 and 60 μg litre -1 ) were applied to young plants (Fragaria ananassa cv Chandler) to determine the effects of exogenous treatments of GA 3 on PAL and TAL activities as mentioned in this paper.
Abstract: Gibberellic acid (GA 3 ) treatments (30 and 60 μg litre -1 ) were applied to young plants (Fragaria ananassa cv Chandler). Fruits were harvested at various developmental stages (14, 21, 28 and 35 days from fruit set). Weight and size, phenolic compounds (total polyphenols and anthocyanins) and enzyme activities, phenylalanine ammonia-lyase (PAL) and tyrosine ammonia-lyase (TAL) were determined. Our aim was to obtain detailed information about PAL and TAL activities related to the strawberry colour during development and ripening processes and to determine the effects of exogenous treatments of GA 3 on PAL and TAL activities. Exogenous treatments of GA 3 improve weight, size and colour of strawberry fruits, and affect PAL and TAL activities. We found that the anthocyanin content and PAL activity are enhanced by the exogenous treatment of GA 3 in the range of 30 μg litre -1 . However, with the higher GA 3 treatment, only the anthocyanin content is affected in that way. These findings suggest that gibberellic acid effect on PAL, TAL and ultimately anthocyanin enhancement is dosage related and saturation of the response occurs at 30 μg litre -1 .

36 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that the use of gibberellic acid (GA) and benzyl adenine (BA) alone or in combination with BA (but not BA alone) promotes dormancy breakage and sprouting in potato tubers.

35 citations

Journal ArticleDOI
TL;DR: Seeds of this species showed non-deep simple (root) - non- deep simple (epicotyl) morphophysiological dormancy, highlighting a high synchronisation with Mediterranean seasonality in all the investigated populations.
Abstract: Morphophysiological dormancy was investigated in seeds of Ribes multiflorum Kit ex Roem et Schult ssp sandalioticum Arrigoni, a rare mountain species endemic to Sardinia (Italy) There were no differences in imbibition rates between intact and scarified seeds, suggesting a lack of physical dormancy, while methylene blue solution (05%) highlighted a preferential pathway for solution entrance through the raphe Embryos were small at seed dispersal, with an initial embryo:seed ratio (E:S) of ca 02 (embryo length, ca 05 mm), whereas the critical E:S ratio for germination was three times longer (ca 06) Gibberellic acid (GA(3), 250 mg · l(-1)) and warm stratification (25 °C for 3 months) followed by low temperature (<15 °C) enhanced embryo growth rate (maximum of ca 004 mm · day(-1) at 10 °C) and subsequent seed germination (radicle emergence; ca 80% at 10 °C) Low germination occurred at warmer temperatures, and cold stratification (5 °C for 3 months) induced secondary dormancy After radicle emergence, epicotyl emergence was delayed for ca 2 months for seeds from three different populations Mean time of epicotyl emergence was affected by GA(3) Seeds of this species showed non-deep simple (root) - non-deep simple (epicotyl) morphophysiological dormancy, highlighting a high synchronisation with Mediterranean seasonality in all the investigated populations

35 citations

Journal ArticleDOI
TL;DR: The data indicate that the physiological state of the aleurone layers contributes to the percentage germination of the grains, and a role of the starchy endosperm in regulating the GA(3) response of the Aleurone layer is suggested.
Abstract: The relationship between barley grain dormancy and gibberellic acid (GA(3)) responsiveness of aleurone layers has been investigated. Barley (Hordeum distichum L. cvs Triumph and Kristina) grains were matured under defined conditions in a phytotron. Grains of Triumph plants grown under long-day/warm conditions had lower dormancy levels than grains of plants grown under short-day/cool conditions. Aleurone layers isolated from grains of long-day Triumph plants secreted more alpha-amylase and had a higher responsiveness to GA(3) as measured by alpha-amylase secretion. Storage of the grains increased both the percentage of germination and the responsiveness of the aleurone to GA(3). Use of different sterilization methods to break dormancy confirmed the correlation between germination percentage and aleurone layer GA(3) responsiveness. The response of embryoless Triumph grains to GA(3) was lower than that of the isolated aleurone layers, suggesting a role of the starchy endosperm in regulating the GA(3) response of the aleurone layer. Grains of the cultivar Kristina harvested from short day- and long day-grown plants lacked dormancy, and their isolated aleurone layers had a similar responsiveness to GA(3) as measured by alpha-amylase secretion. The data indicate that the physiological state of the aleurone layers contributes to the percentage germination of the grains.

35 citations


Network Information
Related Topics (5)
Shoot
32.1K papers, 693.3K citations
94% related
Germination
51.9K papers, 877.9K citations
91% related
Auxin
10.7K papers, 502.6K citations
91% related
Seedling
28.6K papers, 478.2K citations
88% related
Abscisic acid
12.8K papers, 587K citations
88% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023203
2022406
2021133
2020153
2019165
2018196