The cytokinin trans-zeatine riboside increased resistance to heavy metals in the halophyte plant species Kosteletzkya pentacarpos in the absence but not in the presence of NaCl

Zhou, Mingxi; Ghnaya, Tahar; Dailly, Hélène; Cui, Guangling; Vanpee, Brigitte; Han, Ruiming; Lutts, Stanley

doi:10.1016/j.chemosphere.2019.06.023

Cited by 50 publications

(13 citation statements)

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“…The exogenous application of KN at KN L (10 μM) and KN M (50 μM) improved growth under Cd stress and the effect of KN L (10 μM) being more pronounced. In consistent with our results, Zhou et al [ 33 ] also reported better growth on exogenous application of cytokinin trans -zeatine riboside (10 μM) in Kosteletzkyapenta carpos under Zn stress. The observed KN-induced abatement of Cd toxicity on growth may be due to a decrease in Cd content in the plant as reported in earlier studies of eggplant [ 17 ].…”

Section: Discussionsupporting

confidence: 93%

Kinetin mitigates Cd-induced damagesto growth, photosynthesis and PS II photochemistry of Trigonella seedlings by up-regulating ascorbate-glutathione cycle

et al. 2021

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Cytokinins (CKs) plays a key role in plant adaptation over a range of different stress conditions. Here, we analyze the effects of a cytokinin (i.e., kinetin, KN) on the growth, photosynthesis (rate of O2 evolution), PS II photochemistry and AsA–GSH cycle in Trigonella seedlings grown under cadmium (Cd) stress. Trigonella seeds were sown in soil amended with 0, 3 and 9 mg Cd kg-1 soil, and after 15 days resultant seedlings were sprayed with three doses of KN, i.e.,10 μM (low, KNL), 50 μM (medium, KNM) and 100 μM (high, KNH); subsequent experiments were performed after 15 days of KN application, i.e., 30 days after sowing. Cadmium toxicity induced oxidative damage as shown by decreased seedling growth and photosynthetic pigment production (Chl a, Chl b and Car), rates of O2-evolution, and photochemistry of PS II of Trigonella seedlings, all accompanied by an increase in H2O2 accumulation. Supplementation with doses of KN at KNL and KNM significantly improved the growth and photosynthetic activity by reducing H2O2 accumulation through the up-regulation AsA–GSH cycle. Notably, KNL and KNM doses stimulated the rate of enzyme activities of APX, GR and DHAR, involved in the AsA–GSH cycle thereby efficiently regulates the level of AsA and GSH in Trigonella grown under Cd stress. The study concludes that KN can mitigate the damaging effects of Cd stress on plant growth by maintaining the redox status (>ratios: AsA/DHA and GSH/GSSG) of cells through the regulation of AsA-GSH cycle at 10 and 50 μM KN under Cd stress conditions. At 100 μM KN, the down-regulation of AsA-GSH cycle did not support the growth and PS II activity of the test seedlings.

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Section: Discussionsupporting

confidence: 93%

Kinetin mitigates Cd-induced damagesto growth, photosynthesis and PS II photochemistry of Trigonella seedlings by up-regulating ascorbate-glutathione cycle

et al. 2021

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“…The tZ type cytokinin, tZR, is biosynthesized from adenosine phosphate (ATP, ADP or AMP) and DMADP in the roots and transported to shoots via the xylem sap; whereas iP and cZ type cytokinins are probably biosynthesized in the leaves and reverse-transported from the shoot to the root through the phloem (Sakakibara 2006;Kieber & Schaller 2018). Recently, it has been suggested that the riboside-type precursor cytokinins, as well as the active free base, play a signalling role in conferring heavy metal resistance (Daudu et al 2019;Zhou et al 2019). Therefore, iP, tZR and cZR might modulate IspS gene expression.…”

Section: Discussionmentioning

confidence: 99%

Plant hormone profile and control over isoprene biosynthesis in a tropical tree Ficus septica

et al. 2022

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Plant hormone signalling and the circadian clock have been implicated in the transcriptional control of isoprene biosynthesis. To gain more insight into the hormonal control of isoprene biosynthesis, the present study measured plant hormone concentrations in jasmonic acid (JA)‐treated leaves of our previous model study, examined their relationship with gene expression of isoprene synthase (IspS) and hormone signalling transcription factors. Of the plant hormones, IAA and JA‐Ile and their related transcription factors (MYC2 and SAUR21) were significantly correlated with IspS gene expression. Concentrations of cytokinins, isopentenyladenine (iP), trans‐zeatin riboside (tZR) and cis‐zeatin riboside (cZR), were similarly significantly correlated with IspS expression. However, there was no significant correlation between their related transcription factor (ARR‐B) and IspS expression. The circadian clock‐related gene PRR7, but not the transcription factor LHY, was highly correlated with IspS expression. These results suggest that the hormonal balance between JA‐Ile and IAA plays a central role in transcriptional regulation of IspS through the transcription factors MYC2 and SAUR21, the early auxin responsive genes. The putative cis‐acting elements for SAUR on the IspS promoter (TGTCNN and CATATG), in addition to the G‐box for MYC2, support the above proposal. These results provide insightful information on the core components of plant hormone‐related regulation of IspS under coordination with the circadian clock genes.

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“…Several studies disclosed that gibberellic acid relieves various abiotic stresses, including heavy metal toxicity. Gibberellic acid ameliorated Cd toxicity in A. thaliana, by reducing Cd uptake and lipid peroxidation [39]. Exogenous addition of GA3 elevated daidzein and genistein contents in soybean under stress conditions, suggesting the protective effect of GA3 [40].…”

Section: The Effect Of Different Phytohormones On Agnps' Production F...mentioning

confidence: 94%

“…The addition of external kinetin to the cyanobacterial cultures in this study resulted in an increase in the percentage conversion of Ag + to Ag 0 which reached a maximum of 55.16% at the concentration of 7.514 mM and after 40.90 h. Khalil et al [38] demonstrated that the treatment of Phaseolus vulgaris plants with salicylic acid alone or in combination with kinetin increased the plants' resistance to nickel and/or lead stress through enhanced antioxidant systems, proline accumulation, and reduced reactive oxygen species, and also stabilized membrane stability [38]. The cytokinin zeatine increases resistance to heavy metals in the halophyte plant species Kosteletzkya pentacarpos [39]. These studies indicate that kinetin could allow the cyanobacterium to produce silver nanoparticles as a mechanism to control the toxicity of heavy metals, which is supported by the results of our study.…”

Section: The Effect Of Different Phytohormones On Agnps' Production F...mentioning

confidence: 99%

Silver Nanoparticle Production by the Cyanobacterium Cyanothece sp.: De Novo Manipulation of Nano-Biosynthesis by Phytohormones

Mohamed

Semary

Younis

2022

Life

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Background: Numerous cyanobacteria have the potential to reduce metallic ions to form pure metal nanoparticles in a green biosynthesis process. Aim: To investigate the production capacity of silver nanoparticles by the cyanobacterium Cyanothece sp. and to examine the effect of five different phytohormones, indole acetic acid, kinetin; gibberellic acid; abscisic acid; and methyl jasmonate, on this capacity. Methods: The cyanobacterial strain was grown for 60 days and the harvested cyanobacterium biomass was incubated with 0.1 mM of AgNO3. Percentage conversion of Ag+ to Ag0 was calculated to indicate the AgNPs’ production capacity. Different concentrations of the five phytohormones were added to cultures and the AgNP production was monitored throughout different time intervals. Results: Cyanothece sp. biosynthesized spherical AgNPs (diameter range 70 to 140 nm, average diameter 84.37 nm). The addition of indole acetic acid and kinetin provoked the maximum conversion (87.29% and 55.16%, respectively) of Ag+ to Ag0, exceeding or slightly below that of the control (56%). Gibberellic and abscisic acids failed to elevate the Ag+ to Ag0 conversion rate (45.23% and 47.95%, respectively) above that of the control. Methyl jasmonate increased the Ag+ to Ag0 conversion rate to 90.29%, although nearly all the cyanobacterial cultures died at the end. Conclusion: Phytohormones could be used to induce or inhibit the green production of AgNPs with the cyanobacterium Cyanothece sp. This novel manipulation technique may have several applications in agriculture or biomedicine.

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The cytokinin trans-zeatine riboside increased resistance to heavy metals in the halophyte plant species Kosteletzkya pentacarpos in the absence but not in the presence of NaCl

Cited by 50 publications

References 54 publications

Kinetin mitigates Cd-induced damagesto growth, photosynthesis and PS II photochemistry of Trigonella seedlings by up-regulating ascorbate-glutathione cycle

Kinetin mitigates Cd-induced damagesto growth, photosynthesis and PS II photochemistry of Trigonella seedlings by up-regulating ascorbate-glutathione cycle

Plant hormone profile and control over isoprene biosynthesis in a tropical tree Ficus septica

Silver Nanoparticle Production by the Cyanobacterium Cyanothece sp.: De Novo Manipulation of Nano-Biosynthesis by Phytohormones

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