Effects of Environmental Stress Factors on the Actin Cytoskeleton of Fungi and Plants: Ionizing Radiation and ROS

Stephan, Octavian O H

doi:10.22541/au.167286364.45653720/v1

Cited by 3 publications

(11 citation statements)

References 220 publications

(339 reference statements)

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“…Unfortunately, to this day, there are still numerous open questions concerning the role of ROS in actin remodelling of plants. Specifically, the effects of IR‐associated ROS have been insufficiently investigated by only a few studies reviewed by (Stephan, 2023; Stephan, 2021). The interplay of eclectic network components which take part in the regulation of pollen tube germination and growth demonstrates itself as complex, and despite numerous studies on this subject, our picture is still fragmental.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, from the entirety of all observations, the conclusion must be drawn that the action of IR on biological systems very likely depends on the distinct properties of species, individuals, tissues, cell types and their respective physiological conditions. This corresponds to a scenario which depicts IR effects as differential concerning the inherent molecular characteristics of diverse cells (Reisz et al, 2014; Stephan, 2023). In short, biochemical diversity and individual physiological status most probably represent the cause for the unequal impact of IR on various cell types.…”

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

“…Yet, how can this shift to higher doses be explained? Several studies demonstrate IR‐induced changes in transcription profiles in diverse plant cells (reviewed in (Stephan, 2023)), yet studies about pollen are still missing. The available data demonstrate that a substantial number of genes that are related to oxidative stress and the enzymatic antioxidant system of plant cells were particularly deregulated by IR, as well as heat shock proteins and chaperones.…”

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

“…The available data demonstrate that a substantial number of genes that are related to oxidative stress and the enzymatic antioxidant system of plant cells were particularly deregulated by IR, as well as heat shock proteins and chaperones. The performed microarray experiments on irradiated plants show that the number and mRNA levels of transcriptionally deregulated genes greatly vary according to irradiation conditions: acute or chronic and high or low IR doses (Gicquel et al, 2012; Kovalchuk et al, 2007; Stephan, 2023). This complicates experimentation, just as different developmental conditions or cell cycle status in plant tissues during IR exposure.…”

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

“…In addition, the interrelation between actin and ROS (Stephan, 2023) might play a role concerning the observed bio‐positive effects of low IR doses on pollen tube growth. The positive feedback loop between NOX(RBOH)‐produced ROS, ROS‐dependent Ca 2+ ‐channel activation, and Ca 2+ ‐dependent NOX(RBOH) activation altogether have to be fine‐tuned for orderly polarized growth (Kaya et al, 2014; Wudick and Feijo, 2014).…”

Section: The Role Of Reactive Oxygen Species In Ir‐hormesismentioning

confidence: 99%

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Bio‐positive effects of ionizing radiation on pollen: The role of ROS

Stephan

2024

Physiologia Plantarum

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The concept of ‘hormesis’ is defined as a dose–response relationship whereby low doses of various toxic substances or physical stressors trigger bio‐positive effects in diverse biological systems, whereas high doses cause inhibition of cellular performance (e.g. growth, viability). The two‐sided phenomenon of specific low‐dose stimulation and high‐dose inhibition imposed by a ‘hormetic‐factor’ has been well documented in toxicology and pharmacology. Multitudinous factors have been identified that correspondingly cause hormetic effects in diverse taxa of animals, fungi, and plants. This study particularly aims to elucidate the molecular basis for stimulatory implications of ionizing radiation (IR) on plant male gametophytes (pollen). Beyond that, this analysis impacts general research on cell growth, plant breeding, radiation protection, and, in a wider sense, medical treatment. For this purpose, IR‐related data were surveyed and discussed in connection with the present knowledge about pollen physiology. It is concluded that IR‐induced reactive oxygen species (ROS) have a key role here. Moreover, it is hypothesized that IR‐exposure shifts the ratio between diverse types of ROS in the cell. The interrelation between ROS, intracellular Ca2+‐gradient, NADPH oxidases, ROS‐scavengers, actin dynamics, and cell wall properties are most probably involved in IR‐hormesis of pollen germination and tube growth. Modulation of gene expression, phytohormone signalling, and cellular antioxidant capacity are also implicated in IR‐hormesis.

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Section: Discussionmentioning

confidence: 99%

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

Section: The Role Of Reactive Oxygen Species In Ir‐hormesismentioning

confidence: 99%

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Bio‐positive effects of ionizing radiation on pollen: The role of ROS

Stephan

2024

Physiologia Plantarum

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Study of the Radiation Impact of a Uranium Mining Enterprise on the Surrounding Soil and Flora in Turkestan Region

Sartayeva,

Baiseitova,

Khalikova

et al. 2024

Preprint

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The research aimed at the ecological assessment of the environment around uranium mining enterprises in the Turkestan region. The authors examined the state of the soil and vegetation for 2021-2023, their chemical composition and the effects of radiation. Excesses of background radiation were detected by alpha and beta studies. To study the structural organization of plant communities, we conducted floristic studies in the areas immediately adjacent to NAC “Kazatomprom” enterprises. The general habitus, size, number and shape of vegetative parts of plants were taken into account as comparison parameters. The flora growing in the study areas of the Suzak district of the region, which is distinguished by its uniqueness and narrow relevance to the ecological conditions of the area, was taken as biological objects of study. To determine the ecological state of the adjacent territories of NAC “Kazatomprom” and for physical, chemical and taxonomic analyses, 78 soil samples and 37 plant samples were obtained. The studied samples were taken near settlements N, B and S, which are closest to the territories of NAC “Kazatomprom”.

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Bio-positive Effects of Ionizing Radiation on Pollen: The role of ROS

Stephan

2023

Preprint

View full text Add to dashboard Cite

The concept of ‘hormesis’ is defined as a dose-response relationship whereby low doses of various toxic substances or physical stressors trigger bio-positive effects in diverse biological systems, whereas high doses cause inhibition of cellular performance (e.g. growth, viability). The two-sided phenomenon of specific low-dose stimulation and high-dose inhibition imposed by a ‘hormetic-factor’ has been well documented in toxicology and pharmacology. Multitudinous factors have been identified which correspondingly cause hormetic effects in diverse taxa of animals, fungi, and plants. This study particularly aims on elucidating the molecular basis for stimulatory implications of ionizing radiation (IR) on plant male gametophytes (pollen). Beyond that, this analysis impacts general research on cell growth, plant breeding, radiation protection, and in a wider sense medical treatment. For this purpose, IR-related data were surveyed and discussed in connection with the present knowledge about pollen physiology. It is concluded that IR-induced reactive oxygen species (ROS) have a key role here. Moreover, it is hypothesized that IR-exposure shifts the ratio between diverse types of ROS in the cell. The interrelation between ROS, intracellular Ca 2+-gradient, NADPH oxidases, ROS-scavengers, actin dynamics, and cell wall properties are most probably involved in IR-hormesis of pollen germination and tube growth. Modulation of gene expression, phytohormone signalling, and cellular antioxidant capacity are also implicated in IR-hormesis.

show abstract

Effects of Environmental Stress Factors on the Actin Cytoskeleton of Fungi and Plants: Ionizing Radiation and ROS

Cited by 3 publications

References 220 publications

Bio‐positive effects of ionizing radiation on pollen: The role of ROS

Bio‐positive effects of ionizing radiation on pollen: The role of ROS

Study of the Radiation Impact of a Uranium Mining Enterprise on the Surrounding Soil and Flora in Turkestan Region

Bio-positive Effects of Ionizing Radiation on Pollen: The role of ROS

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