Beyond Non-Photochemical Fluorescence Quenching: The Overlapping Antioxidant Functions of Zeaxanthin and Tocopherols

Havaux, Michel; Garcı́a-Plazaola, José Ignacio

doi:10.1007/978-94-017-9032-1_26

Cited by 37 publications

(38 citation statements)

References 148 publications

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“…By contrast, plastochromanol did not show this kind of correlation, suggesting a less pronounced role than for α‐tocopherol in the Q. pubescens antioxidant response to drought. Moreover, the correlation found between α‐tocopherol and the xanthophyll cycle is interesting because those compounds are known to have overlapping antioxidant functions as thylakoid membranes protectors (Havaux & García‐Plazaola, ). The increase of the xanthophyll cycle content concomitantly with the Ψ pd drop confirms this overlap hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Resistance of native oak to recurrent drought conditions simulating predicted climatic changes in the Mediterranean region

Saunier

Ormeño

Havaux

et al. 2018

Plant Cell & Environment

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The capacity of a Quercus pubescens forest to resist recurrent drought was assessed on an in situ experimental platform through the measurement of a large set of traits (ecophysiological and metabolic) studied under natural drought (ND) and amplified drought (AD) induced by partial rain exclusion. This study was performed during the third and fourth years of AD, which correspond to conditions of moderate AD in 2014 and harsher AD in 2015, respectively. Although water potential (Ψ) and net photosynthesis (Pn) were noticeably reduced under AD in 2015 compared to ND, trees showed similar growth and no oxidative stress. The absence of oxidative damage could be due to a strong accumulation of α-tocopherol, suggesting that this compound is a major component of the Q. pubescens antioxidant system. Other antioxidants were rather stable under AD in 2014, but slight changes started to be observed in 2015 (carotenoids and isoprene) due to harsher conditions. Our results indicate that Q. pubescens could be able to cope with AD, for at least 4 years, likely due to its antioxidant system. However, growth decrease was observed during the fifth year (2016) of AD, suggesting that this resistance could be threatened over longer periods of recurrent drought.

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Section: Discussionmentioning

confidence: 99%

Resistance of native oak to recurrent drought conditions simulating predicted climatic changes in the Mediterranean region

Saunier

Ormeño

Havaux

et al. 2018

Plant Cell & Environment

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“…The xanthophyll zeaxanthin has a dual role in thermal dissipation and in antioxidation (Havaux and Niyogi 1999). The two main lipophilic antioxidants in biological membranes are zeaxanthin and tocopherols that act synergistically in protection against photosensitized lipid peroxidation mediated by singlet oxygen (Wrona et al 2003;Havaux and García-Plazaola 2014); zeaxanthin, however, is formed only under excess light, while tocopherols are constitutively present.…”

Section: Interplay Between Chloroplast Modulators In the Context Of Lmentioning

confidence: 99%

“…Photoprotection was quantified as thermal energy dissipation of excess light via non-photochemical quenching (NPQ) of chlorophyll fluorescence coupled with assessment of photoprotective compounds (xanthophylls and tocopherols) that counteract formation of reactive-oxygen species and/or detoxify reactive-oxygen species and other reactive species. We quantified the levels of the high-light forms zeaxanthin and antheraxanthin formed in the violaxanthin, antheraxanthin, and zeaxanthin (VAZ) cycle that are associated with thermal dissipation of excess energy (and NPQ;Demmig-Adams et al 2012) as well as the levels of tocopherols as antioxidant metabolites (Havaux and García-Plazaola 2014).…”

Section: Introductionmentioning

confidence: 99%

Differences in light-harvesting, acclimation to growth-light environment, and leaf structural development between Swedish and Italian ecotypes of Arabidopsis thaliana

Stewart

Cohu

Polutchko

et al. 2015

Planta

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Leaf morphological differences have an impact on light distribution within the leaf, photosynthesis, and photoprotection in Arabidopsis thaliana ecotypes from near the limits of this species' latitudinal distribution in Europe. Leaf morphology, photosynthesis, and photoprotection were characterized in two Arabidopsis ecotypes from near the limits of this species' latitudinal distribution in Europe (63°N and 42°N). The Swedish ecotype formed thicker leaves and upregulated photosynthesis more substantially than the Italian ecotype in high-light environments. Conversely, the smaller rosette formed, and lesser aboveground biomass accumulated, by the Swedish versus the Italian ecotype in low growth-light environments is consistent with a lesser shade tolerance of the Swedish ecotype. The response of the thinner leaves of the Italian ecotype to evenly spaced daily periods of higher light against a background of otherwise non-fluctuating low light was to perform the same rate of photosynthesis with less chlorophyll, rather than exhibiting greater rates of photosynthesis. In contrast, the thicker leaves of the Swedish ecotype showed elevated photosynthetic performance in response to daily supplemental higher light periods in a low-light growth environment. These findings suggest significant self-shading in the lower depths of leaves of the Swedish ecotype by the chloroplasts residing in the upper portions of the leaf, resulting in a requirement for higher incident light to trigger photosynthetic upregulation in the lower portions of its thicker leaves. Conversely, photoprotective responses in the Italian ecotype suggest that more excess light penetrated into the lower depths of this ecotype's leaves. It is speculated that light absorption and the degree of utilization of this absorbed light inform cellular signaling networks that orchestrate leaf structural development, which, in turn, affects light distribution and the level of absorbed versus photosynthetically utilized light in a leaf.

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“…). Indeed, XC pigments are not totally and exclusively involved in the NPQ process, which contributes to their apparent global quenching efficiency, because they have additional photoprotective functions such as, in particular, antioxidants (Esteban and García‐Plazaola , Havaux and García‐Plazaola ). An apparently loser link between xanthophyll cycle content, DES, and related NPQ depends on many intracellular variables including the synthesis and function of NPQ regulatory partners other than the XC pigments, and firstly a large diversity of proteins of the light‐harvesting complex‐LHC (Büchel , Wobbe et al.…”

Section: What Is the Xanthophyll Cycle (Xc)‐related Nonphotochemical mentioning

confidence: 99%

Diversity in Xanthophyll Cycle Pigments Content and Related Nonphotochemical Quenching (NPQ) Among Microalgae: Implications for Growth Strategy and Ecology

Lacour

Babin

Lavaud

2020

Journal of Phycology

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Xanthophyll cycle‐related nonphotochemical quenching (NPQ), which is present in most photoautotrophs, allows dissipation of excess light energy. Xanthophyll cycle‐related NPQ depends principally on xanthophyll cycle pigments composition and their effective involvement in NPQ. Xanthophyll cycle‐related NPQ is tightly controlled by environmental conditions in a species‐/strain‐specific manner. These features are especially relevant in microalgae living in a complex and highly variable environment. The goal of this study was to perform a comparative assessment of NPQ ecophysiologies across microalgal taxa in order to underline the specific involvement of NPQ in growth adaptations and strategies. We used both published results and data acquired in our laboratory to understand the relationships between growth conditions (irradiance, temperature, and nutrient availability), xanthophyll cycle composition, and xanthophyll cycle pigments quenching efficiency in microalgae from various taxa. We found that in diadinoxanthin‐containing species, the xanthophyll cycle pigment pool is controlled by energy pressure in all species. At any given energy pressure, however, the diatoxanthin content is higher in diatoms than in other diadinoxanthin‐containing species. XC pigments quenching efficiency is species‐specific and decreases with acclimation to higher irradiances. We found a clear link between the natural light environment of species/ecotypes and quenching efficiency amplitude. The presence of diatoxanthin or zeaxanthin at steady state in all species examined at moderate and high irradiances suggests that cells maintain a light‐harvesting capacity in excess to cope with potential decrease in light intensity.

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Beyond Non-Photochemical Fluorescence Quenching: The Overlapping Antioxidant Functions of Zeaxanthin and Tocopherols

Cited by 37 publications

References 148 publications

Resistance of native oak to recurrent drought conditions simulating predicted climatic changes in the Mediterranean region

Resistance of native oak to recurrent drought conditions simulating predicted climatic changes in the Mediterranean region

Differences in light-harvesting, acclimation to growth-light environment, and leaf structural development between Swedish and Italian ecotypes of Arabidopsis thaliana

Diversity in Xanthophyll Cycle Pigments Content and Related Nonphotochemical Quenching (NPQ) Among Microalgae: Implications for Growth Strategy and Ecology

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