Glutathione and hydrogen sulfide are required for sulfur‐mediated mitigation of Cr(VI) toxicity in tomato, pea and brinjal seedlings

Kushwaha, Bishwajit Kumar; Singh, Vijay Pratap

doi:10.1111/ppl.13024

Cited by 40 publications

(16 citation statements)

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“…Although in animals, the role of 2‐OG as a regulator of the oxidative stress is known (Graf et al 2013, Zdzisińska et al 2017), the implication of 2‐OG priming in mitigating metal toxicity in plants was not known. Moreover, although NO is now a well‐known signaling molecule involved in regulating stress responses in plants (Xiong et al 2010, Sahay and Gupta 2017, Nabi et al 2019, Terrón‐Camero et al 2019, Kushwaha and Singh 2020, Piacentini et al 2020, Sharma et al 2020), its involvement in 2‐OG priming‐mediated mitigation of metal toxicity was unidentified so far. Therefore, the results of this study are promising from a metal toxicity mitigation point of view as 2‐OG‐priming is capable of significantly attenuating As V toxicity in tomato roots by involving the endogenous NO level.…”

Section: Discussionmentioning

confidence: 99%

Priming of tomato seedlings with 2‐oxoglutarate induces arsenic toxicity alleviatory responses by involving endogenous nitric oxide

et al. 2020

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Metal toxicity in crop plants is a matter of scientific concern. Therefore, in recent years efforts have been made to minimize metal toxicity in crop plants. Out of various strategies, priming of seedlings with certain chemicals, like e.g. donors of signaling molecules, nutrients, metabolites or plant hormones has shown encouraging results. However, mechanisms related with the priming‐induced mitigation of metal toxicity are still poorly known. Hence, we have tested the potential of 2‐oxoglutarate (2‐OG) priming in enhancing the arsenate (AsV) toxicity tolerance in tomato seedlings along with deciphering the probable role of nitric oxide (NO) in accomplishing this task. Arsenate decreased growth, endogenous NO and nitric oxide synthase‐like activity but enhanced the accumulation of As, which collectively led to root cell death. Arsenate toxicity also decreased some photosynthetic characteristics (i.e. Fv/Fm, qP, Fv/F0 and Fm/F0, and total chlorophyll content) but enhanced NPQ. However, priming with 2‐OG alleviated the toxic effect of AsV on growth, endogenous NO, cell death and photosynthesis. Moreover, arsenate inhibited the activities of enzymes of nitrogen metabolism (i.e. nitrate reductase, nitrite reductase, glutamine synthetase and glutamine 2‐oxoglutarate aminotransferase) but increased the activity of glutamate dehydrogenase and NH4+ content. Superoxide radicals, hydrogen peroxide, lipid peroxidation, protein oxidation and membrane damage increased upon AsV exposure, but the antioxidant enzymes (i.e. superoxide dismutase, catalase and glutathione‐S‐transferase) showed differential responses. Overall, our results showed that 2‐OG is capable of alleviating AsV toxicity in tomato seedlings but the involvement of endogenous NO is probably required.

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Section: Discussionmentioning

confidence: 99%

Priming of tomato seedlings with 2‐oxoglutarate induces arsenic toxicity alleviatory responses by involving endogenous nitric oxide

et al. 2020

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“…Paul and Roychoudhury (2019), Pandey and Gautam (2019) Research articles have covered diverse new roles of H 2 S and NO in regulating abiotic stress in plants. Kushwaha and Singh (2019) and Ahmad et al (2019) have reported various mechanisms through which H 2 S regulates chromium toxicity in crop plants. Regulatory roles of NO and H 2 S were reported for salt and drought stress, as well as iron deficiency in plants (Batista et al 2019, Gohari et al 2019, Jahan et al 2019, Kaya et al 2019a).…”

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confidence: 99%

Hydrogen sulfide and nitric oxide signal integration and plant development under stressed/non‐stressed conditions

Singh

Tripathi

Fotopoulos

2020

Physiologia Plantarum

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In the past decade, hydrogen sulfide (H 2 S) and nitric oxide (NO) have emerged as major signaling molecules which are involved in most life cycle processes in plants, i.e. from seed germination to plant death. H 2 S and NOregulated development of plants requires integration of complex signaling networks and also involves other signaling pathways. Moreover, to re-establish cellular redox homeostasis under stress conditions, regulation of gene expression takes place, which helps in achieving an appropriate plant response. In this context, the most significant controls occur at the transcriptional, posttranscriptional and post-translational levels which help in acquiring adaptive changes in stress-challenged plants. Although various studies have demonstrated the role of H 2 S and NO in regulating a plethora of plant growth and development processes under stressed/nonstressed conditions, much remains to be elucidated regarding their roles in plant biology. Therefore, this special issue was organized to collect state-of-the-art plant research involving H 2 S and NO under changing environmental conditions. This special issue has collected seven reviews and 11 original research articles aimed at compiling a comprehensive status quo on the implication of H 2 S and NO signaling in plant biology.Review articles herein provide an up-to-date coverage of existing progress in this continuously growing research area. Prakash et al. (2019) have examined the role of NO and ROS (reactive oxygen species) in governing root system architecture in plants. Rai et al. (2019) have given an overview of NO and salicylic acid signaling towards acquired heat tolerance in plants. Paul and Roychoudhury (2019), Pandey and Gautam (2019) and Singh et al. (2019) have covered exhaustive current roles of H 2 S and NO in plants under changing environmental conditions. Finally, Sharma et al. (2019) and Shivaraj et al. (2019) have discussed molecular mechanisms and crosstalk of NO and H 2 S in metal stress tolerance. Research articles have covered diverse new roles of H 2 S and NO in regulating abiotic stress in plants. Kushwaha and Singh (2019) and Ahmad et al. (2019) have reported various mechanisms through which H 2 S regulates chromium toxicity in crop plants. Regulatory roles of NO and H 2 S were reported for salt and drought stress, as well as iron deficiency in plants (Batista et al. 2019, Gohari et al. 2019, Jahan et al. 2019, Kaya et al. 2019a). The role of NO and H 2 S along with that of Si was evaluated for the regulation of cadmium stress in plants (Kaya et al. 2019b). Muñoz-Vargas et al. (2019) have noticed inhibition of NADP-malic enzyme activity by H 2 S and NO in sweet pepper. Furthermore, the role of H 2 S was examined in regulating photosynthesis under overnight frost and daytime high light in avocado (Joshi et al. 2019). Finally, Kataria et al. (2019) have reported crucial role of nitrate reductase-dependent production of NO in regulating magnetopriming-induced salt tolerance in soybean.All together, this collection of articles pres...

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“…This interplay between glutathione and hydrogen sulfide points to a universal importance for the regulation of plant tolerance to heavy metal stress. This notion was proved by Kushwaha and Singh [158] who showed that in S. lycopersicum, Pisum sativum, and Solanum melongena seedlings that the interplay between glutathione and hydrogen sulfide regulates the mitigation of chromium toxicity. Even though studies have highlighted a link between glutathione and hydrogen sulfide in plants under heavy metal stress, these studies only focused on applying exogenous hydrogen sulfide.…”

Section: Amplification Of the Ros Signal By Glutathione Could Improvementioning

confidence: 92%

Decoding Heavy Metal Stress Signalling in Plants: Towards Improved Food Security and Safety

Keyster

Niekerk

Basson

et al. 2020

Plants

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The mining of heavy metals from the environment leads to an increase in soil pollution, leading to the uptake of heavy metals into plant tissue. The build-up of toxic metals in plant cells often leads to cellular damage and senescence. Therefore, it is of utmost importance to produce plants with improved tolerance to heavy metals for food security, as well as to limit heavy metal uptake for improved food safety purposes. To achieve this goal, our understanding of the signaling mechanisms which regulate toxic heavy metal uptake and tolerance in plants requires extensive improvement. In this review, we summarize recent literature and data on heavy metal toxicity (oral reference doses) and the impact of the metals on food safety and food security. Furthermore, we discuss some of the key events (reception, transduction, and response) in the heavy metal signaling cascades in the cell wall, plasma membrane, and cytoplasm. Our future perspectives provide an outlook of the exciting advances that will shape the plant heavy metal signaling field in the near future.

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Glutathione and hydrogen sulfide are required for sulfur‐mediated mitigation of Cr(VI) toxicity in tomato, pea and brinjal seedlings

Cited by 40 publications

References 51 publications

Priming of tomato seedlings with 2‐oxoglutarate induces arsenic toxicity alleviatory responses by involving endogenous nitric oxide

Priming of tomato seedlings with 2‐oxoglutarate induces arsenic toxicity alleviatory responses by involving endogenous nitric oxide

Hydrogen sulfide and nitric oxide signal integration and plant development under stressed/non‐stressed conditions

Decoding Heavy Metal Stress Signalling in Plants: Towards Improved Food Security and Safety

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