Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency

Rubio-Wilhelmi, María M.; Sánchez-Rodríguez, Eva; Rosales, Miguel A.; Blasco, Begoña; Ríos, Juan J.; Romero, Luís; Blumwald, Eduardo; Ruiz, Juan M.

doi:10.1016/j.envexpbot.2011.03.005

Cited by 64 publications

(51 citation statements)

References 51 publications

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“…Different responses to N treatments have been observed. For example, N deficiency leads to oxidative damage in tobacco and rice plants, resulting in increased SOD, CAT, and MDA (Huang et al 2004;Rubio-Wilhelmi et al 2011). However, N addition did not result in any oxidative stress on the cells of biocrusts in the present study.…”

Section: Changes In Antioxidative Enzyme Activity In Response To N Adcontrasting

confidence: 76%

Divergence in physiological responses between cyanobacterial and lichen crusts to a gradient of simulated nitrogen deposition

2015

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Background and aims Nitrogen (N) deposition in arid lands is known to be increasing. However, N deposition gradients have unclear effects on physiological characteristics of biocrusts. This study tested if physiological characteristics are stimulated by low levels of N deposition and reduced by high levels of N deposition. Methods We simulated N deposition at various rates to plots of cyanobacterial and lichen biocrusts in the Gurbantunggut Desert and measured indicators of growth and stress. Results In cyanobacterial crusts, most evidence suggests that biomass and growth are unaffected by lower levels of N but suppressed at the highest level. Biomass and growth of lichen crusts were less sensitive to N addition but, in the case of actual photochemical efficiency, were also suppressed at the highest N addition rate. Most osmotic adjustment substances of cyanobacterial and lichen crusts did not show significant responses after N addition. In the two crusts, minor increase in antioxidative enzyme activity was found in some N addition rates but no similar trends between the crust types were observed. Conclusions Physiological performance of cyanobacterial crusts was more sensitive to high levels of N addition than that of lichen crusts. Increasing N deposition might greatly affect cyanobacterial crusts before lichen crusts.

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Section: Changes In Antioxidative Enzyme Activity In Response To N Adcontrasting

confidence: 76%

Divergence in physiological responses between cyanobacterial and lichen crusts to a gradient of simulated nitrogen deposition

2015

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“…Although ROS exert as a signal molecule in plant growth and development, excessive production of ROS such as superoxide anion (O 2 À ), hydrogen peroxide (H 2 O 2 ), and hydroxyl radicals (HO ) result in oxidative damage by initiating lipid peroxidation and degrading proteins, nucleic acids, and cell membranes (Mittler, 2002). Plant cells can upregulation of CK level by overexpression of IPT genes results in plant tolerance to drought (Merewitz et al, 2011;Kuppu et al, 2013;Reguera et al, 2013), nitrogen deficiency (Rubio-Wilhelmi et al, 2011), and Zn resistance (Pavlíková et al, 2014a,b;Pavlíková et al, 2014a,b). CKs can enhance plant stress tolerance by induction of synthesis of chloroplast proteins, promoting photosynthesis, maintenance of accumulation of amino acids, regulation of carbon and nitrogen metabolism, interation with ABA, and activation of antioxidant defense system (Hu et al, 2012;Ding et al, 2013;Kuppu et al, 2013;Reguera et al, 2013;Pavlíková et al, 2014a;Singh and Prasad, 2014;Wu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Modulation of zinc-induced oxidative damage in Solanum melongena by 6-benzylaminopurine involves ascorbate–glutathione cycle metabolism

Ding

et al. 2015

Environmental and Experimental Botany

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“…Abscisic acid and cytokinins interact antagonistically causing opposite effects on various plant developmental processes including stomatal conductance, seed germination, and cotyledon expansion (Blackman and Davies 1984 ;Thomas 1992 ). It is also reported that high CK accumulating in plants show improved nutrient effi ciency during nutrient defi ciency (Rubio-Wilhelmia et al 2011 ). It has been observed that cytokinins infl uence the nitrogen metabolism (Sakakibara et al 2006 ) by enhancing nitrate reductase activity in plants (Sykorova et al 2008 ).…”

Section: Mechanism Of Actionmentioning

confidence: 95%

Role of Phytohormones in Stress Tolerance of Plants

Nadeem

Ahmad

Zahir³

et al. 2016

Plant, Soil and Microbes

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Environmental stresses, both biotic and abiotic, cause negative impact on plant growth and development, and plants need to adopt certain strategies for maintaining proper growth under stress conditions. These strategies include certain physiological, biochemical, and molecular mechanisms to cope with these stresses. These mechanisms include the production of hormones (phytohormones) and osmolytes. Phytohormones are organic molecules that affect various plant physiological processes like growth, development, and cell differentiation. Phytohormones regulate key physiological events under normal and stress conditions. They play a vital role for enhancing the ability of plants to adapt to the harsh environmental conditions by mediating a wide range of adaptive responses. These responses enable the plants to acclimatize to adverse soil conditions. Various types of phytohormones play an important function in plants individually or in coordination with each other. The nature and level of these hormones in plants are major factors that infl uence plant processes and functions. The present chapter describes the potential role of phytohormones for promoting plant growth and development under stress conditions. The major classes of plant hormones and their source of production have been described. Metabolism of phytohormones and their physiological responses with special reference to their concentration-dependent or negative impact on plant growth have been discussed in detail. The impact of these hormones on plant growth under stress conditions has been reviewed and discussed with selected examples. Also, the role of microbes in phytohormone production has been elaborated with examples. Future perspectives of the area have also been discussed.

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Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency

Cited by 64 publications

References 51 publications

Divergence in physiological responses between cyanobacterial and lichen crusts to a gradient of simulated nitrogen deposition

Divergence in physiological responses between cyanobacterial and lichen crusts to a gradient of simulated nitrogen deposition

Modulation of zinc-induced oxidative damage in Solanum melongena by 6-benzylaminopurine involves ascorbate–glutathione cycle metabolism

Role of Phytohormones in Stress Tolerance of Plants

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