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.
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TL;DR: Hormone sprays eliminate the need for light induction of the enzyme and kinetin and gibberellic acid permit induction of nitrate reductase in leaves of tobacco in the dark.
Abstract: Suitable concentrations of kinetin and gibberellic acid permit induction of nitrate reductase in leaves of tobacco in the dark Hormone sprays eliminate the need for light induction of the enzyme The concentration of gibberellic acid required for optimal induction varies according to the concentration of kinetin supplied
34 citations
TL;DR: Results provide evidence for a correlative role of gibberellins in flower development and modified the climacteric ethylene rise in a manner consistent with the extension of longevity.
Abstract: Gibberellic acid at concentrations of 10−5 M and 10−4 M delayed the senescence of cut carnation flowers, when applied continuously via the stem, to flowers between the closed brush and fully open stages of development. Older flowers with reflexed petals were unresponsive. Treatment with paclobutrazol, an inhibitor of GA biosynthesis, prevented tight buds from opening fully, reduced the longevity of partially open flowers, but was ineffective when applied continuously to fully open flowers. Gibberellic acid-treated flowers did not show simultaneous petal inrolling, a known indicator of senescence, and the time to complete petal drying was extended. Gibberellic acid modified the climacteric ethylene rise in a manner consistent with the extension of longevity. These results provide evidence for a correlative role of gibberellins in flower development.
34 citations
TL;DR: The results indicated that the prolonging effect of low concentrations of NAA at the initial budding stages was more effective compared with its application at other stages of development and at higher concentrations.
Abstract: In this study, experiments were conducted to investigate the effects of NAA and GA3, on bract longevity under exposed sunlight conditions and six months of observation. Bougainvillea bracts at four different stages of bract development were sprayed with gibberellic acid ( 100 ppm GA3), naphthaleneacetic acid (50, 100 and 150 ppm NAA) and mixed GA3 ( 100 ppm) and NAA concentrations (50,100 and 150 ppm). Bract longevity was found to be almost 10 days longer in NAA (50, 100 and 150 ppm) than in the water control and in GA3 (100 ppm) treatment. In the case of GA3 and NAA (50. 100 and 150 ppm) treatment on alternative days, bract longevity was 30 days longer when compared with the water control. It was also observed that a delay in discoloration and stomata conductance were increased in the presence of GA3, with low a concentration of NAA. The results indicated that the prolonging effect of low concentrations of NAA at the initial budding stages was more effective compared with its application at other stages of development and., at higher concentrations. Maximum bract weight and shoot length were observed, in the GA3 and GA3, plus NAA treated flowers. © 2009 Asian Network for Scientific Information.
34 citations
TL;DR: Seeds of Anthriscus sylvestris have physiologically dormant, underdeveloped embryos; thus, they have morphophysiological dormancy (MPD), and in situ germination could result in rapid depletion of seeds buried in the soil.
34 citations
TL;DR: The results reported here, when viewed in light of the results of other workers, provide good evidence that CCC, AMO-1618 and Phosfon D inhibit α-amylase production by inhibiting the synthesis of gibberellin or gibb Berellin-like hormone(s) during germination of barley seed.
Abstract: The effect of growth retarding compounds, (2-chloroethyl)trimethylammonium chloride (CCC), 2-isopropyl-4-dimethylamino-5-methylphenyl-1-piperidinecarboxylate methyl chloride (AMU-1618), tributyl-2,4-dichlorobenzylphosphonium chloride (Phosfon D) and N-dimethylamino succinamic acid (B-995) on α-amylase production in germinating barley seed was studied. Seeds were germinated in growth retardants in presence and absence of gibberellic acid (GA3). CCC, AMO-1618 and Phosfon D inhibitedα-amylase production in germinating seed and the effect was reversed by GA3 Phosfon D and AMO-1618 were stronger inhibitors of α-amylase production than CCC. CCC was by far the strongest inhibitor of all the other analogs tested. B-995 was comparatively only slightly inhibitory.
The results reported here, when viewed in light of the results of other workers, provide good evidence that CCC, AMO-1618 and Phosfon D inhibit α-amylase production by inhibiting the synthesis of gibberellin or gibberellin-like hormone(s) during germination of barley seed. Consistent with other reports, B-995 possibly acts by other mechanism (s).
34 citations