Managing reactive oxygen species—Some learnings from high altitude extremophytes

Kumar, Arun; Guleria, Shweta; Ghosh, Dipanshu; Dogra, Vivek; Kumar, Sanjay

doi:10.1016/j.envexpbot.2021.104525

Cited by 15 publications

(13 citation statements)

References 164 publications

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“…P. tamarugo showed specific changes in primary and secondary metabolism, differing for the other two congeneric species (Figure 4b, Table S3, Table S5). Under the extreme growth conditions evaluated in this work, high production of ROS could be produced because of the combination of stressing environmental factors (Pospíšil, 2016;Kumar et al , 2021). Therefore, we expected high levels of secondary metabolites with antioxidant roles in the leaves of the three Prosopis species, as reported for other extremophyte species that inhabit the Atacama Desert (Morales-Tapiaet al , 2020), and other desert environments (Ahmad et al , 2021).…”

Section: Leaf Pigment Plays a Major Role In The Outlier Response Ofp ...supporting

confidence: 54%

Living in extreme environments: a photosynthetic and desiccation stress tolerance trade-off story, but not for everyone.

Bravo

Gajardo

Morales

et al. 2023

Preprint

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A trade-off between allocated resources for photosynthesis and stress tolerance is generally observed in nature. Thus, the search for outlier species breaking this trend is an interesting approach to identity new mechanisms for plant breeding purposes. Hypothetically, outlier extremophyte species present a distinctive arrangement of physiological functions that favor stress tolerance mechanisms without jeopardizing investment allocation into photosynthesis. We explored this trade-off, analyzing twenty-one plant species for desiccation tolerance, and photosynthetic capacity, under the extreme arid environments of the Atacama Desert and the Surire Salar in the Chilean Altiplano. Most of the studied species followed the trade-off tendency, however, we did find one outlier species, Prosopis tamarugo. To study the mechanisms involved in this atypical response, the Prosopis genus was analyzed more deeply. Our results suggest that the outlier response of P. tamarugo is multifactorial. This species presented a high photochemistry activity, associated with a higher synthesis of chlorophylls, photoprotective pigments, and complex antioxidant molecules. Moreover, the synthesis of no-nitrogen osmoprotectant molecules, such as ciceritol and mannitol in P. tamarugo, would allow the allocation of nitrogen to support its high photosynthetic capacity, without compromising its leaf desiccation stress tolerance.

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Section: Leaf Pigment Plays a Major Role In The Outlier Response Ofp ...supporting

confidence: 54%

Living in extreme environments: a photosynthetic and desiccation stress tolerance trade-off story, but not for everyone.

Bravo

Gajardo

Morales

et al. 2023

Preprint

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“…ROS production is considered to be the starting signal of multiple immune pathways in plants, with the ability to enhance ion flow, NO production, and lead to the closure of plant stomata, which have an important role in the plant’s immune response [ 141 , 142 , 143 ]. Meanwhile, the strong scavenging system of plants ensures that ROS content in tissues will not be too high while ROS is produced at a high speed [ 144 , 145 ].…”

Section: Signaling Pathways Of Fungal Elicitor-triggered Plant Immunitymentioning

confidence: 99%

Advances in Fungal Elicitor-Triggered Plant Immunity

Guo

Cheng

2022

IJMS

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There is an array of pathogenic fungi in the natural environment of plants, which produce some molecules including pathogen-associated molecular patterns (PAMPs) and effectors during infection. These molecules, which can be recognized by plant specific receptors to activate plant immunity, including PTI (PAMP-triggered immunity) and ETI (effector-triggered immunity), are called elicitors. Undoubtedly, identification of novel fungal elicitors and their plant receptors and comprehensive understanding about fungal elicitor-triggered plant immunity will be of great significance to effectively control plant diseases. Great progress has occurred in fungal elicitor-triggered plant immunity, especially in the signaling pathways of PTI and ETI, in recent years. Here, recent advances in fungal elicitor-triggered plant immunity are summarized and their important contribution to the enlightenment of plant disease control is also discussed.

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“…Hormones play an essential role in regulating the expression of HSR and maintaining the balance between growth and defense (Labidi et al, 2021). Heat shock‐led oxidative damage to biomolecules results in the instigation of signaling cascades coupling hormones to activate HSR (Dogra et al, 2018; Foyer, 2018; Kumar et al, 2021). Among phytohormones, growth hormones play a significant role in regulating plants' responses to environmental stress conditions.…”

Section: Introductionmentioning

confidence: 99%

“…To sustain under stressful conditions, plants undergo quick morphological, physiological, and molecular adjustments (Janska et al, 2010). These adjustments, also referred to as heat shock response (HSR), includes the activation of chaperones, growth regulators, and antioxidant and detoxification system to protect the cellular machinery and minimize ROS production and consequent damage (Devireddy et al, 2021; Kapoor et al, 2019; Kumar et al, 2021). Perturbations in cellular homeostasis also alter the osmotic pressure within the cells (Blum, 2017).…”

Section: Introductionmentioning

confidence: 99%

Seed priming with brassinolides improves growth and reinforces antioxidative defenses under normal and heat stress conditions in seedlings of Brassica juncea

Neha

Twinkle

Mohapatra

et al. 2022

Physiologia Plantarum

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Environmental stresses pose a major challenge for plant researchers to fulfill increasing food demand. Researchers are trying to generate high‐yielding and stress‐tolerant or resistant varieties using classical genetics and modern gene‐editing tools; however, both approaches have limitations. Chemical treatments emerged as an alternative to improve yield and impart stress resilience. Brassinosteroids (BRs) are a group of phytohormones that regulate various biological processes, including stress management. With foliar spray methods, BR treatments showed promising results but are not economically feasible. We hypothesize that priming of seeds, which requires lesser amounts of BRs, could be equally effective in promoting growth and stress tolerance. Owing to this notion, we analyzed the impact of priming seeds with selected BRs, namely, 24‐epibrassinolide (EBL) and 28‐homobrassinolide (HBL), in Brassica juncea under normal and heat shock stress conditions. Seeds primed with BRs and grown until seedlings stage at normal conditions (20°C) were subjected to a heat shock (35°C) for a few hours, relating to what plants experience in natural conditions. Heat shock reduced the growth and biomass with an increased accumulation of reactive oxygen species. As anticipated, BRs treatments significantly improved the growth and physiological parameters with an enhanced antioxidant defense under both conditions. Transcriptional analyses revealed that BRs concomitantly induce growth and oxidative stress‐responsive gene expression via the canonical BR‐signaling pathway. Transfer of unstressed and heat‐shock‐treated seedlings to field conditions demonstrated the long‐term effectivity of BR‐priming. Our results showed seed priming with BRs could improve growth and resilience against heat shock; hence, it appears to be a viable strategy to enhance crop yields and stress tolerance.

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Managing reactive oxygen species—Some learnings from high altitude extremophytes

Cited by 15 publications

References 164 publications

Living in extreme environments: a photosynthetic and desiccation stress tolerance trade-off story, but not for everyone.

Living in extreme environments: a photosynthetic and desiccation stress tolerance trade-off story, but not for everyone.

Advances in Fungal Elicitor-Triggered Plant Immunity

Seed priming with brassinolides improves growth and reinforces antioxidative defenses under normal and heat stress conditions in seedlings of Brassica juncea

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