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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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Journal ArticleDOI
TL;DR: Results show that K. paniculata seeds exhibit both exogenous and endogenous dormancy, and a combination of GA and chilling (GA-chilling) helped to alleviate seed dormancy in a relatively short period of time.

68 citations

Journal Article
TL;DR: The effects of priming treatments are related to de novo protein synthesis, an improved repair mechanism, and germination substrates for vigorous and earlier production of seedlings.
Abstract: Seed priming improves vigor, but priming agents may differ greatly in their effectiveness. The present study was performed to unravel the physiological basis of vigor improvement by priming sunflower achenes with pre-optimized levels of hydrogen peroxide (H2O2), salicylic acid (SA), thiourea (TU), gibberellic acid (GA3), ascorbic acid (AA), sodium chloride (NaCl), freezing and heating. Most of the treatments induced de novo synthesis of peptides with low (37 kDa for H2O2, SA and NaCl treatments, and 57 kDa for SA and TU treatments) and high (157 kDa for H2O2, SA, TU, GA3 and AA treatments and 167 kDa for SA treatment) molecular mass, reduced solute leakage, and an enhanced soluble sugar pool in the achenes. Priming reduced days to 50% germination (T50) and mean germination time (MGT) and improved germination energy (GE) and final germination percentage (FGP). Shoot length was improved by priming with H2O2, GA3, and NaCl; root length with NaCl and H2O2; shoot and root dry weight with H2O2, SA and AA. Positive correlations between GE and FGP and expressed peptides, soluble sugars, shoot and root length, and dry weight and negative ones with EC of leachate suggested that pre-germination changes in primed achenes, in addition to improve germination, show lasting effects in promoting seedling growth. Of the treatments, H2O2, SA, TU and GA3 were the most effective. Overall, the effects of priming treatments are related to de novo protein synthesis, an improved repair mechanism, and germination substrates for vigorous and earlier production of seedlings.

68 citations

Journal ArticleDOI
TL;DR: Temperature had a strong effect on the induction of dormancy of bulblets generated on scale explants of Lilium speciosum Thunb.
Abstract: We have studied the effect of various in-vitro conditions on dormancy of bulblets generated on scale explants of Lilium speciosum Thunb. cv. ‘Rubrum’ nr. 10. The bulblets were harvested after 11 weeks of culture. Dormancy was measured by determining the percent emergence in soil of viable, non-cold-treated bulblets. A study of the physical conditions showed that temperature had a strong effect on the induction of dormancy (15°C induced hardly any dormancy; 25°C induced a high level of dormancy), whereas short or long day and light or dark had no effect. Of the medium components, a low concentration of sucrose (1 gl−1 or less) or a high concentration of gibberellic acid (1 mg 1−1) reduced the level of dormancy. Application of various concentrations of abscisic acid, 6-benzylaminopurine, α-naphthaleneacetic acid, indole-3-acetic acid, 2,3,5-triiodobenzoic acid or a Murashige and Skoog macro- and microelement mixture did not affect the dormancy status.

68 citations

Journal ArticleDOI
TL;DR: Results indicate that the promotive and protective effects of fluridone and norflurazon on the conditioning and germination of O. minor seeds would be attributed to other perturbations rather than the inhibition of ABA-biosynthesis.
Abstract: Fluridone and norflurazon, two carotenoid-biosynthesis inhibitors, shortened the conditioning period required by seeds of Orobanche minor in order to respond to the germination stimulant strigol. Neither fluridone nor norflurazon alone induced seed germination of O. minor, they promoted strigol-induced germination. In addition, these compounds restored the conditioning and germination of seeds at a supraoptimal temperature (30 degrees C) as well as in the light. Gibberellic acid (GA(3)) showed similar promotive and protective effects on the conditioning and germination of O. minor seeds. Although fluridone and norflurazon are known to prevent abscisic acid (ABA)-biosynthesis, and stresses such as supraoptimal temperatures have been reported to induce ABA accumulation in plants, the amount of ABA in the seeds or that released from the seeds into the conditioning media was not affected by the fluridone treatment and by exposure to the supraoptimal temperature. These results indicate that the promotive and protective effects of fluridone and norflurazon on the conditioning and germination of O. minor seeds would be attributed to other perturbations rather than the inhibition of ABA-biosynthesis.

68 citations

Journal ArticleDOI
TL;DR: Data suggested the mutants of sweet potato induced with ethylmethanesulphonate were more salt tolerant than control plants.
Abstract: Salt tolerant cultivars of sweet potato (Ipomoea batatas L.) can be obtained from induced mutation. The objective of the present study was to induce mutation for salt tolerance using ethylmethanesulphonate (EMS) in calli of sweet potato, followed by cell line selection and subsequent plant regeneration. Calli initiated from leaf explants were treated with 0.5% EMS for 0, 1, 1.5, 2, 2.5 and 3 h, followed by rinsing with sterile distilled water for four times. Preliminary experiments showed that 200 mM NaCl could be used as selection pressure. Salt tolerant calli were sub-cultured on medium supplemented with 200 mM NaCl for selection of mutant cell lines and this process repeated 5 times (20 days each). The selected calli were transferred onto somatic embryo formation medium, which was Murashige and Skoog (MS) medium supplemented with 4 mg l−1 abscisic acid (ABA), 10 mg l−1 gibberellic acid (GA). After 15 days, somatic embryos were transferred onto MS medium supplemented with 0.05 mg l−1 ABA, 0.2 mg l−1 zeatin (ZT) for regeneration. Plants designated as ML1, ML2 and ML3 were regenerated from the somatic embryos formed by calli treated with 0.5% EMS for 2 and 2.5 h. After propagation, salt tolerance of these mutants was investigated. Data suggested the mutants were more salt tolerant than control plants.

67 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023203
2022406
2021133
2020153
2019165
2018196