Evidence for Positive Regulation by Gibberellins and Ethylene of ACC Oxidase Expression and Activity During Transition From Dormancy to Germination in Fagus sylvatica L. Seeds

Calvo, Angel Pablo; Nicolás, Carlos; Lorenzo, Óscar; Nicolás, G.; Rodrı́guez, Dolores

doi:10.1007/s00344-004-0074-7

Cited by 58 publications

(48 citation statements)

References 41 publications

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“…Similarly, improved seed germination in both dormant and non-dormant seeds had been reported in response to the application of ethylene (Kepczynski and Kepczynska, 1997;Matilla, 2000;Kucera et al, 2005). In the present study, enhanced seed germination by the application of CaC 2 was significantly correlated (0.71) with increased ethylene evolution and these results were coincided as reported by Machabee andSaini (1991), andCalvo et al (2004), describing that ethylene was involved in regulation of seed germination. Different peaks of ethylene evolution were observed after the beginning of imbibition in cucumber seeds while ethylene emission was increased with passage of time.…”

Section: Discussionsupporting

confidence: 91%

Calcium Carbide-induced Changes in Germination, Morpho-phenological and Yield Traits in Cucumber (Cucumis sativus)

Shakar¹,

Yaseen²,

Niaz³

et al. 2016

IJAB

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To cite this paper: Shakar, M., M. Yaseen, A. Niaz, R. Mahmood, M.M. Iqbal and T. Naz, 2016. Calcium carbide-induced changes in germination, morphophenological and yield traits in cucumber (Cucumis sativus ) suppressed germination rate of cucumber seeds. Likewise, lower rates of CaC 2 were also found effective in enhancing the root and hypocotyl lengths, number of lateral roots and fresh weight of seedling while the highest rate of CaC 2 was proved inhibitory. It was recorded that the CaC 2 induced improvement in seed germination was significantly correlated (r = 0.75) with magnitude of ethylene production during imbibition. Moreover, a pot experiment was conducted under natural conditions to select optimum rate and coating material of CaC 2 regarding growth and yield parameters of cucumber. It was found that all rates of CaC 2 , irrespective of coating materials, exhibited new primary branches, early female flowering and fruit maturity. Maximum response regarding female flower count, fruit yield and ethylene emission was obtained by the application of paint coated CaC 2 at 300 mg pot -1 , which resulted in 34% more fruit yield compared to control plants.

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Section: Discussionsupporting

confidence: 91%

Calcium Carbide-induced Changes in Germination, Morpho-phenological and Yield Traits in Cucumber (Cucumis sativus)

Shakar¹,

Yaseen²,

Niaz³

et al. 2016

IJAB

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“…PAC reduced ethylene-induced adventitious root growth by 33%, and the effect of PAC was partly reversed by application of exogenous GA 3 , demonstrating that active GA was reduced by PAC treatment. Ethylene and GA also cooperate to break dormancy in beech (Fagus sylvatica) seeds (Calvo et al, 2004). In beech, a stimulatory effect of ethylene on seed germination was shown to be reverted by PAC (Calvo et al, 2004), indicating that the transition from seed dormancy to germination in beech may be regulated through similar hormone interactions as growth of adventitious roots in rice.…”

Section: Discussionmentioning

confidence: 99%

Epidermal Cell Death in Rice Is Regulated by Ethylene, Gibberellin, and Abscisic Acid

2005

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Programmed cell death (PCD) of epidermal cells that cover adventitious root primordia in deepwater rice (Oryza sativa) is induced by submergence. Early suicide of epidermal cells may prevent injury to the growing root that emerges under flooding conditions. Induction of PCD is dependent on ethylene signaling and is further promoted by gibberellin (GA). Ethylene and GA act in a synergistic manner, indicating converging signaling pathways. Treatment of plants with GA alone did not promote PCD. Treatment with the GA biosynthesis inhibitor paclobutrazol resulted in increased PCD in response to ethylene and GA presumably due to an increased sensitivity of epidermal cells to GA. Abscisic acid (ABA) was shown to efficiently delay ethylene-induced as well as GA-promoted cell death. The results point to ethylene signaling as a target of ABA inhibition of PCD. Accumulation of ethylene and GA and a decreased ABA level in the rice internode thus favor induction of epidermal cell death and ensure that PCD is initiated as an early response that precedes adventitious root growth.

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“…An increase in endogenous GAs has been interrelated to the dormancy-breaking process (Fernández et al 1997). Calvo et al (2004) suggest cross-talk regulation by several phytohormones in the transition from seed dormancy to germination. Kucera et al (2005) summarize the phytohormone effects: GA releases dormancy, promotes germination and counteracts ABA effects.…”

Section: Introductionmentioning

confidence: 94%

Storage compounds, ABA and fumarase in Fagus sylvatica embryos during stratification

Eliášová¹,

Pešek²,

Vondráková³

2015

Dendrobiology

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Understanding the mechanisms of seed dormancy is essential for planning optimal seed storage and for breaking the dormancy of stored seeds. Our experiments focused on three aspects of characterization of breaking the dormancy of Fagus sylvatica seeds during moist low temperature stratification. 1) We used the changes of ABA content in embryos during the whole process of stratification as the marker of the depth of dormancy: the decrease in the depth of dormancy (according standard germination tests) was directly proportional to the drop in endogenous ABA content in both cotyledons and embryonic axes. 2) Fumarase activity (the second marker of dormancy) increased gradually during stratification.3) The histochemical visualisation of storage compounds as the third marker of dormancy documented the changes in storage protein deposition during stratification. The proteinaceous content of storage vacuoles disappeared; the vacuoles diminished, petered out or fused, creating central vacuoles. This process commenced with imbibition of the seeds and it was more pronounced in the cells in the external parts of the cotyledons. No changes in the size and location of starch grains or calcium oxalate crystals linked with stratification were detected.

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Evidence for Positive Regulation by Gibberellins and Ethylene of ACC Oxidase Expression and Activity During Transition From Dormancy to Germination in Fagus sylvatica L. Seeds

Cited by 58 publications

References 41 publications

Calcium Carbide-induced Changes in Germination, Morpho-phenological and Yield Traits in Cucumber (Cucumis sativus)

Calcium Carbide-induced Changes in Germination, Morpho-phenological and Yield Traits in Cucumber (Cucumis sativus)

Epidermal Cell Death in Rice Is Regulated by Ethylene, Gibberellin, and Abscisic Acid

Storage compounds, ABA and fumarase in Fagus sylvatica embryos during stratification

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