Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion

Mýtinová, Z.; Motyka, Václav; Haisel, D.; Lubovská, Zuzana; Trávníčková, Alena; Dobrev, Petre I.; Holı́k, Josef; Wilhelmová, N.

doi:10.1007/s10725-011-9571-4

Cited by 19 publications

(10 citation statements)

References 59 publications

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“…In this study, one cytokinin dehydrogenase was significantly up-regulated in the root tissue of Hua 11 by NaCl-treatment. Due to the fact that the concentrations of endogenous cytokine can be reduced by the cytokinin dehydrogenase, the antioxidative enzyme activity increases as cytokine decreases [72]. Therefore, the barley salt stress tolerance may be improved by the enhancement of antioxidant enzymes.…”

Section: Discussionmentioning

confidence: 99%

Comparative Transcriptional Profiling of Two Contrasting Barley Genotypes under Salinity Stress during the Seedling Stage

Gao

Guo³

et al. 2013

International Journal of Genomics

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Salinity is one of the major abiotic stresses that affect crop productivity. Identification of the potential novel genes responsible for salt tolerance in barley will contribute to understanding the molecular mechanism of barley responses to salt stress. We compared changes in transcriptome between Hua 11 (a salt-tolerant genotype) and Hua 30 (a salt sensitive genotype) in response to salt stress at the seedling stage using barley cDNA microarrays. In total, 557 and 247 salt-responsive genes were expressed exclusively in the shoot and root tissue of the salt-tolerant genotype, respectively. Among these genes, a number of signal-related genes, transcription factors and compatible solutes were identified and some of these genes were carefully discussed. Notably, a LysM RLK was firstly found involved in salt stress response. Moreover, key enzymes in the pathways of jasmonic acid biosynthesis, lipid metabolism and indole-3-acetic acid homeostasis were specifically affected by salt stress in salt tolerance genotype. These salt-responsive genes and biochemical pathways identified in this study could provide further information for understanding the mechanisms of salt tolerance in barley.

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Section: Discussionmentioning

confidence: 99%

Comparative Transcriptional Profiling of Two Contrasting Barley Genotypes under Salinity Stress during the Seedling Stage

Gao

Guo³

et al. 2013

International Journal of Genomics

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“…In this context, the excess of CKs in plant often affects cellular processes, that are not otherwise under the regulation of CKs. Interestingly, using a reverse approach, it has been shown that reduced CK levels affect activities of antioxidant enzymes during the life span of tobacco [149]. For example, transgenic tobacco overexpressing Arabidopsis AtCKX2 under the control of a constitutive 35S promoter revealed enhanced activities of SOD, glutathione reductase (GR) and ascorbate peroxidase (APX) [149].…”

Section: Cks Enhance Antioxidant Defense Systemsmentioning

confidence: 99%

Role and Regulation of Cytokinins in Plant Response to Drought Stress

Hải

Chuong

et al. 2020

Plants

103

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Cytokinins (CKs) are key phytohormones that not only regulate plant growth and development but also mediate plant tolerance to drought stress. Recent advances in genome-wide association studies coupled with in planta characterization have opened new avenues to investigate the drought-responsive expression of CK metabolic and signaling genes, as well as their functions in plant adaptation to drought. Under water deficit, CK signaling has evolved as an inter-cellular communication network which is essential to crosstalk with other types of phytohormones and their regulating pathways in mediating plant stress response. In this review, we revise the current understanding of CK involvement in drought stress tolerance. Particularly, a genetic framework for CK signaling and CK crosstalk with abscisic acid (ABA) in the precise monitoring of drought responses is proposed. In addition, the potential of endogenous CK alteration in crops towards developing drought-tolerant crops is also discussed.

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“…Plant hormones are known to be involved in antioxidant responses of many plants (Mýtinová et al, 2011). For example, an influence of exogenously applied cytokinin on catalase (CAT) and peroxidase (POD) activities has been observed in axillary multiplication of Pelargonium hortorum (Wojtania and Skrzypek, 2014), and adventitious shoot formation in Pinus strobus (Tang and Newton, 2005).…”

Section: Introductionmentioning

confidence: 99%

Morphological and Biochemical Responses to Gibberellic Acid in Magnolia × ‘Spectrum’ in Vitro

Wojtania

Skrzypek

Gabryszewska

2016

Acta Biologica Cracoviensia S. Botanica

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The total soluble sugar content and antioxidant enzyme activities were studied for the first time during axillary shoot formation in Magnolia × 'Spectrum' in vitro in response to BAP (0.3 mg l -1 ), different levels of gibberellic acid (GA 3 ; 0.0, 0.1, 0.5, 1.0 mg l -1 ), sucrose (20 and 30 g l -1 ) and nitrogen salts (KNO 3 /NH 4 NO 3 ; 100/100% and 75/50% relative to MS medium). Among various GA 3 and sucrose/nitrogen salts ratios, the most effective axillary multiplication (5.9 shoots/explant) and leaf formation (25.7 leaves per multiplied clumps) were obtained after addition of GA 3 at 0.1 mg l -1 to a BAP medium containing 20 g l -1 sucrose and reduced levels of nitrogen salts (75% KNO 3 and 50% NH 4 NO 3 ). The addition of GA 3 to the BAP medium enhanced shoot formation by 36% and leaf formation by 27%. The highest shoot formation capacity of M. × 'Spectrum' in vitro coincided with enhanced levels of soluble sugar and peroxidase (POD) activity. Increasing GA 3 concentration from 0.1 to 1.0 mg l -1 in the above medium resulted in inhibition of shoot and leaf formation and a decrease in the soluble sugar content. The influence of GA 3 on the activities of catalase (CAT) and POD depended on its concentration and the levels of sucrose and nitrogen salts in the medium. The highest increase in CAT and POD activities, that coincided with the enhanced shoot formation capacity of M. × 'Spectrum' in vitro, was observed after addition of GA 3 to the medium containing high levels of sucrose and nitrogen salts.

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Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion

Cited by 19 publications

References 59 publications

Comparative Transcriptional Profiling of Two Contrasting Barley Genotypes under Salinity Stress during the Seedling Stage

Comparative Transcriptional Profiling of Two Contrasting Barley Genotypes under Salinity Stress during the Seedling Stage

Role and Regulation of Cytokinins in Plant Response to Drought Stress

Morphological and Biochemical Responses to Gibberellic Acid in Magnolia × ‘Spectrum’ in Vitro

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