Physiological Effect of Kinetin on the Photosynthetic Apparatus and Antioxidant Enzymes Activities During Production of Anthurium

Moura, Fabiana B. de; Vieira, Marcos Ribeiro da Silva; Simões, Adriano do Nascimento; Ferreira‐Silva, Sérgio Luiz; Souza, Carlos A.V. de; Souza, Eduardo Soares de; Rocha, Alexandre Tavares da; Silva, Luzia F. da; Júnior, Miguel Alves

doi:10.1016/j.hpj.2018.04.001

Cited by 13 publications

(11 citation statements)

References 61 publications

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“…Nevertheless, the exogenous application of kinetin tended to modulate the dampening effects of cold stress on the PSII operating efficiency, hence resulting in improved gas exchange, which was accompanied with higher Φ PSII , ETR and an improved quantum efficiency in kinetin-treated plants compared to the non-treated plants under cold stress conditions (Tables 1-3). Our results agree with a number of studies which reported the positive effects of exogenous kinetin treatment on the photosynthetic machinery [34,46]. Although the protective roles of kinetin are concentration dependent, similar to the concentration used in the current study, de Moura et al [46] reported that 0.35 mM (75 mg L −1 ) effectively improved the carboxylation efficiency, with corresponding effects on the photosynthetic apparatus.…”

Section: Discussionsupporting

confidence: 93%

“…Our results agree with a number of studies which reported the positive effects of exogenous kinetin treatment on the photosynthetic machinery [34,46]. Although the protective roles of kinetin are concentration dependent, similar to the concentration used in the current study, de Moura et al [46] reported that 0.35 mM (75 mg L −1 ) effectively improved the carboxylation efficiency, with corresponding effects on the photosynthetic apparatus. It has been reported that kinetin induces stomatal opening, hence encouraging gas exchange with associated net CO 2 assimilation under stress conditions [47].…”

Section: Discussionsupporting

confidence: 93%

“…Basing on related works [29,34,39,46], it was presumed that the concentration of kinetin used in the current study would have significant physiological effects on the coffee plants. Foliar sprays were administered three times every after 3 days, using a hand sprayer immediately after the growth chamber lights were routinely turned off.…”

Section: Kinetin and Cold Stress Treatmentsmentioning

confidence: 98%

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Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Acidri

Sawai²,

Sugimoto³

et al. 2020

Plants

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Coffee plants are seasonally exposed to low chilling temperatures in many coffee-producing regions. In this study, we investigated the ameliorative effects of kinetin—a cytokinin elicitor compound on the nonenzymatic antioxidants and the photosynthetic physiology of young coffee plants subjected to cold stress conditions. Although net CO2 assimilation rates were not significantly affected amongst the treatments, the subjection of coffee plants to cold stress conditions caused low gas exchanges and photosynthetic efficiency, which was accompanied by membrane disintegration and the breakdown of chlorophyll pigments. Kinetin treatment, on the other hand, maintained a higher intercellular-to-ambient CO2 concentration ratio with concomitant improvement in stomatal conductance and mesophyll efficiency. Moreover, the leaves of kinetin-treated plants maintained slightly higher photochemical quenching (qP) and open photosystem II centers (qL), which was accompanied by higher electron transfer rates (ETRs) compared to their non-treated counterparts under cold stress conditions. The exogenous foliar application of kinetin also stimulated the metabolism of caffeine, trigonelline, 5-caffeoylquinic acid, mangiferin, anthocyanins and total phenolic content. The contents of these nonenzymatic antioxidants were highest under cold stress conditions in kinetin-treated plants than during optimal conditions. Our results further indicated that the exogenous application of kinetin increased the total radical scavenging capacity of coffee plants. Therefore, the exogenous application of kinetin has the potential to reinforce antioxidant capacity, as well as modulate the decline in photosynthetic productivity resulting in improved tolerance under cold stress conditions.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Section: Kinetin and Cold Stress Treatmentsmentioning

confidence: 98%

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Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Acidri

Sawai²,

Sugimoto³

et al. 2020

Plants

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“…Hydrogen peroxide is also neutralized by the APX-GSH cycle with the concomitant generation of redox components including GSH, AsA, as well as NADPH, so that electron transport is maintained. Recently in Anthurium, de Moura et al [67] have reported increased activities of antioxidant enzymes due to the foliar application of Kn, resulting in improved photosynthetic performance. Cadmium reduces the endogenous cytokinin synthesis and induces oxidative damage to lipids through the excessive generation of ROS, thereby reducing growth [68].…”

Section: Discussionmentioning

confidence: 99%

Combined Kinetin and Spermidine Treatments Ameliorate Growth and Photosynthetic Inhibition in Vigna angularis by Up-Regulating Antioxidant and Nitrogen Metabolism under Cadmium Stress

Ahanger

Aziz

Sahli³

et al. 2020

Biomolecules

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Pot experiments were conducted to investigate the probable beneficial role of the individual as well as combined application of kinetin (50 μM Kn) and spermidine (200 μM Spd) on Vigna angularis under cadmium (Cd) stress. Cd treatment reduced growth by declining the content of chlorophylls and carotenoids, photosynthesis, and gas exchange parameters. Exogenously, Kn and Spd application enhanced the photosynthetic parameters and up-regulated the antioxidant system by improving the activities of antioxidant enzymes and the content of non-enzymatic components. In addition, the application of Kn and Spd resulted in significant improvement in the content of sugars, proline, and glycine betaine, ameliorating the decline in relative water content. Oxidative stress parameters including hydrogen peroxide, superoxide, lipid peroxidation, lipoxygenase activity, and electrolyte leakage increased due to Cd stress; however, the application of Kn and Spd imparted a significant decline in all these parameters. Further, reduced Cd uptake was also observed due to Kn and Spd application. Total phenols and flavonoids also increased due to Kn and Spd treatments under normal as well as Cd stress conditions, which may have further helped with the elimination of reactive oxygen species. Reduction in the activity of nitrate reductase and the content of nitrogen was ameliorated due to the exogenous application of Kn and Spd. Therefore, the exogenous application of Kn and Spd benefited Vigna angularis counteracting the damaging effects of Cd stress by up-regulating the tolerance mechanisms, including antioxidant and osmolyte metabolism.

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“…Aside from the above effects, CKs and their derivatives are able to influence the activity of antioxidant enzymes [35,82]. It was observed that the application of BAP prevents the degradation of chlorophyll in wheat senescent leaves and increases the activity of enzymes CAT and APX [35,83,84,85].…”

Section: Ability Of Cks and Ck Derivatives To Improve The Antioxidmentioning

confidence: 99%

Role of Cytokinins in Senescence, Antioxidant Defence and Photosynthesis

Hönig

Plíhalová

Husičková

et al. 2018

IJMS

167

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Cytokinins modulate a number of important developmental processes, including the last phase of leaf development, known as senescence, which is associated with chlorophyll breakdown, photosynthetic apparatus disintegration and oxidative damage. There is ample evidence that cytokinins can slow down all these senescence-accompanying changes. Here, we review relationships between the various mechanisms of action of these regulatory molecules. We highlight their connection to photosynthesis, the pivotal process that generates assimilates, however may also lead to oxidative damage. Thus, we also focus on cytokinin induction of protective responses against oxidative damage. Activation of antioxidative enzymes in senescing tissues is described as well as changes in the levels of naturally occurring antioxidative compounds, such as phenolic acids and flavonoids, in plant explants. The main goal of this review is to show how the biological activities of cytokinins may be related to their chemical structure. New links between molecular aspects of natural cytokinins and their synthetic derivatives with antisenescent properties are described. Structural motifs in cytokinin molecules that may explain why these molecules play such a significant regulatory role are outlined.

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Physiological Effect of Kinetin on the Photosynthetic Apparatus and Antioxidant Enzymes Activities During Production of Anthurium

Cited by 13 publications

References 61 publications

Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Combined Kinetin and Spermidine Treatments Ameliorate Growth and Photosynthetic Inhibition in Vigna angularis by Up-Regulating Antioxidant and Nitrogen Metabolism under Cadmium Stress

Role of Cytokinins in Senescence, Antioxidant Defence and Photosynthesis

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