Ecophysiological adaptations of two halophytes to salt stress: Photosynthesis, PS II photochemistry and anti-oxidant feedback – Implications for resilience in climate change

Duarte, Bernardo; Santos, D.; Marques, João Carlos

doi:10.1016/j.plaphy.2013.03.004

Cited by 159 publications

(109 citation statements)

References 48 publications

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“…The efficient activation of these enzymes points out towards an efficient mechanism, not only for dissipation of the excessive reducing power by the non-photochemical mechanisms, but also for detoxification of the dangerous products resultant of the accumulation of excessive energy. This was also verified in other halophytic species during stress-induced photochemical impairment as a protective measure from the excessive reducing power, even under efficient dissipation (Duarte et al, 2013b).…”

Section: Discussionsupporting

confidence: 55%

“…The accumulation of energy even with efficient dissipative mechanisms leads to the generation of reactive oxygen species (ROS) that by itself can also damage the PSII and the cellular components of the ETC (Duarte et al, 2013b). To counteract this damaging effects of ROS, the cell has a machinery mainly composed by enzymatic mechanisms, in order to degrade these molecules and prevent cellular damage, namely at the photosynthetic apparatus level.…”

Section: Discussionmentioning

confidence: 99%

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Biophysical probing of Spartina maritima photo-system II changes during prolonged tidal submersion periods

Duarte

Santos

Marques

2014

Plant Physiology and Biochemistry

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a b s t r a c tSubmergence is one of the major constrains affecting wetland plants, with inevitable impacts on their physiology and productivity. Global warming as a driving force of sea level rise, tend to increase the submersion periods duration. Photosynthesis biophysical probing arise as an important tool to understand the energetics underlying plant feedback to these constrains. As in previous studies with Spartina maritima, there was no inhibition of photosynthetic activity in submerged individuals. Comparing both donor and acceptor sides of the PSII, the first was more severely affected during submersion, driven by the inactivation of the OEC with consequent impairment of the ETC. Although this apparent damage in the PSII donor side, the electron transport per active reaction centre was not substantially affected, indicating that this reduction in the electron flow is accompanied by a proportional increase in the number of active reaction centres. These conditions lead to the accumulation of excessive reducing power, source of damaging ROS, counteracted by efficient energy dissipation processes and anti-oxidant enzymatic defences. This way, S. maritima appears as a well-adapted species with an evident photochemical plasticity towards submersion, allowing it to maintain its photosynthetic activity even during prolonged submersion periods.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Biophysical probing of Spartina maritima photo-system II changes during prolonged tidal submersion periods

Duarte

Santos

Marques

2014

Plant Physiology and Biochemistry

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“…In the long term, salt stress can also affect the photosynthetic process due to salt accumulation in young leaves [9] and decreases in chlorophyll and carotenoid concentrations even in halophyte plants [14,174,175]. The photosynthesis rate (PN) can drop due to stomatal closure (gs), and/or other non-stomatal limitations, like the disturbance of the photosynthetic electron chain and/or the inhibition of the Calvin Cycle enzymes, such as Rubisco, phosphoenol pyruvate carboxylase (PECP), ribulose-5-phosphate kinase, glyceraldehyde-3-phosphate dehydrogenase or fructose-1,6-bisphosphatase [18,176].…”

Section: Photosynthesis and Chlorophyll Fluorescencementioning

confidence: 99%

Plant Responses to Salt Stress: Adaptive Mechanisms

Acosta‐Motos¹,

Ortuño²,

Bernal‐Vicente³

et al. 2017

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This review deals with the adaptive mechanisms that plants can implement to cope with the challenge of salt stress. Plants tolerant to NaCl implement a series of adaptations to acclimate to salinity, including morphological, physiological and biochemical changes. These changes include increases in the root/canopy ratio and in the chlorophyll content in addition to changes in the leaf anatomy that ultimately lead to preventing leaf ion toxicity, thus maintaining the water status in order to limit water loss and protect the photosynthesis process. Furthermore, we deal with the effect of salt stress on photosynthesis and chlorophyll fluorescence and some of the mechanisms thought to protect the photosynthetic machinery, including the xanthophyll cycle, photorespiration pathway, and water-water cycle. Finally, we also provide an updated discussion on salt-induced oxidative stress at the subcellular level and its effect on the antioxidant machinery in both salt-tolerant and salt-sensitive plants. The aim is to extend our understanding of how salinity may affect the physiological characteristics of plants.

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“…As any other kind of stress, any adverse conditions to which halophytes are exposed have its more evident expression on the plant primary productivity (Duarte et al, 2013aSantos et al, 2014). The impacts of metal stress on halophytes are no exception and can thus be assessed at the primary productivity basis, the light harvesting mechanisms.…”

Section: Biophysical Markers-role and Implication In Metal/metalloid-mentioning

confidence: 99%

“…Despite, the fact that some salt marsh halophyte species can withstand some degree of metal/metalloid contamination, excessive concentration of metals/metalloids in the soil, driven from long-term accumulation or toxic discharges, can not only cause damages toward the plants, but also be potentially harmful to human health, through food chain . Besides these facts, halophytes inhabit naturally harsh environments subjected to a variety of stresses like flooding, and excessive salinities, and metal/metalloid levels (Duarte et al, 2013aAnjum et al, 2014a). Previous facts together are indicative of a strong stress-adaptive potential of halophytes.…”

Section: Introductionmentioning

confidence: 99%

Biophysical and Biochemical Markers of Metal/Metalloid-Impacts in Salt Marsh Halophytes and Their Implications

Anjum

Duarte

Sleimi

et al. 2016

Front. Environ. Sci.

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As a major sink, estuarine/salt marsh ecosystem can receive discharges laden with myriads of contaminants including metals/metalloids from man-made activities. Two among the major consequences of metal/metalloid-exposure in estuarine/salt marsh ecosystem flora such as halophytic plants are: (a) the excessive accumulation of light energy that in turn leads to severe impairments in the photosystem II (PS II), and (b) metal/metalloids-accrued elevation in the cellular reactive oxygen species (ROS) that causes imbalance in the cellular redox homeostasis. On one hand, plants adopt several strategies to dissipate excessive energy hence eventually to avoid damage in the PS II and maintain optimum photosynthesis. On the other hand, components of the cellular redox system quickly respond to metal/metalloid-exposure, where plants try to maintain a fine-tuning among these components, and tightly control the level of ROS and its potential consequences. Herein, major insights into, and the significance and implications of important biophysical and biochemical markers in metal/metalloid-exposed halophytes are overviewed and also highlighted main aspects so far least explored in the present context. Discussion advocates to regularly monitor and integrate studies on the highlighted herein biophysical and biochemical markers taking into account the missing aspects such as essential and non-essential metal/metalloid-speciation, -availability, and -methylation, role of the obvious microbial activities, and a comparative account of the outcomes of the studies on mixture of metal/metalloid performed in laboratory and field conditions. Thus, consideration of these missing aspects in future studies on the subject can help us to: (a) unveil the status of the metal/metalloid-contamination and -impact; (b) understand adaptive responses of salt marsh halophyte to metals/metalloids, and also (c) to devise sustainable strategies for the environmental or ecosystem management and safety.

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Ecophysiological adaptations of two halophytes to salt stress: Photosynthesis, PS II photochemistry and anti-oxidant feedback – Implications for resilience in climate change

Cited by 159 publications

References 48 publications

Biophysical probing of Spartina maritima photo-system II changes during prolonged tidal submersion periods

Biophysical probing of Spartina maritima photo-system II changes during prolonged tidal submersion periods

Plant Responses to Salt Stress: Adaptive Mechanisms

Biophysical and Biochemical Markers of Metal/Metalloid-Impacts in Salt Marsh Halophytes and Their Implications

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