Respuestas antioxidantes en dos ecotipos de Colobanthus quitensis (Caryophyllaceae) expuestos a alta radiación UV-B y baja temperatura

Navarrete-Gallegos, Alejandro A; Bravo, León A.; Molina‐Montenegro, Marco A.; Corcuera, Luís J.

doi:10.4067/s0716-078x2012000400005

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…For instance, experiments performed in two Antarctic vascular plants have shown that while Deschampsia antarctica diverts c. 30% of its photosynthetic electron transport through the oxygen‐dependent sink, electron transport to oxygen in C. quitensis is negligible (Pérez‐Torres et al , ). The contribution of oxygen as an alternative electron sink relies on efficient detoxification of oxygen anion radicals to hydrogen peroxide and water by chloroplastic antioxidant enzymes, superoxide dismutase (SOD) and APX, respectively, consistent with the observation that D. antarctica has much higher SOD activity than C. quitensis (Navarrete‐Gallegos et al , ) and other cultivated Poaceae such as oat, barley or wheat (Pérez‐Torres et al , ). The importance of this pool of antioxidant enzymes has been confirmed using transgenic strategies.…”

Section: Photobiochemistrysupporting

confidence: 76%

How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story

et al. 2020

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Summary In this work, we review the physiological and molecular mechanisms that allow vascular plants to perform photosynthesis in extreme environments, such as deserts, polar and alpine ecosystems. Specifically, we discuss the morpho/anatomical, photochemical and metabolic adaptive processes that enable a positive carbon balance in photosynthetic tissues under extreme temperatures and/or severe water‐limiting conditions in C3 species. Nevertheless, only a few studies have described the in situ functioning of photoprotection in plants from extreme environments, given the intrinsic difficulties of fieldwork in remote places. However, they cover a substantial geographical and functional range, which allowed us to describe some general trends. In general, photoprotection relies on the same mechanisms as those operating in the remaining plant species, ranging from enhanced morphological photoprotection to increased scavenging of oxidative products such as reactive oxygen species. Much less information is available about the main physiological and biochemical drivers of photosynthesis: stomatal conductance (gs), mesophyll conductance (gm) and carbon fixation, mostly driven by RuBisCO carboxylation. Extreme environments shape adaptations in structures, such as cell wall and membrane composition, the concentration and activation state of Calvin–Benson cycle enzymes, and RuBisCO evolution, optimizing kinetic traits to ensure functionality. Altogether, these species display a combination of rearrangements, from the whole‐plant level to the molecular scale, to sustain a positive carbon balance in some of the most hostile environments on Earth.

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Section: Photobiochemistrysupporting

confidence: 76%

How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story

et al. 2020

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“…Previous reports of ChlF measurements on C. quitensis populations were exclusively focused in comparison with the Arctowski and La Parva populations under specific situations such as high UV-B radiation, low temperature, cold acclimation, and light intensity [ 14 , 24 , 25 , 26 ]. In general, in those studies, as with ours, Antarctic individuals showed higher photosynthetic performance than plants from La Parva.…”

Section: Resultsmentioning

confidence: 99%

“…(Caryophyllaceae) is a eudicotyledon, extremophile, stress-tolerant plant that inhabits low temperature environments from southern Mexico to maritime Antarctica. Given its wide geographical distribution and the isolation in which various populations of this species have developed, ecotypes adapted to particular environments have been generated [ 12 , 13 , 14 , 15 ]. The C. quitensis populations or geo-ecotypes show morphological and genetic variability, which is attributed to continuous selection processes in response to the environmental conditions prevailing in each habitat [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Calcium Oxalate Crystals in Leaves of the Extremophile Plant Colobanthus quitensis (Kunth) Bartl. (Caryophyllaceae)

Gómez-Espinoza

González-Ramírez

Méndez-Gómez

et al. 2021

Plants

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The presence of calcium oxalate (CaOx) crystals has been widely reported in the plant kingdom. These structures play a central role in various physiological functions, including calcium regulation, metal detoxification, and photosynthesis. However, precise knowledge about their possible roles and functions in plants is still limited. Therefore, the present work aims to study the ecotypic variability of Colobanthus quitensis, an extremophile species, concerning CaOx crystal accumulation. The CaOx crystals were studied in leaves of C. quitensis collected from different provenances within a latitudinal gradient (From Andes mountains in central Chile to Antarctica) and grown under common garden conditions. Polarized light microscopy, digital image analysis, and electron microscopy were used to characterize CaOx crystals. The presence of CaOx crystals was confirmed in the four provenances of C. quitensis, with significant differences in the accumulation among them. The Andean populations presented the highest accumulation of crystals and the Antarctic population the lowest. Electron microscopy showed that CaOx crystals in C. quitensis are classified as druses based on their morphology. The differences found could be linked to processes of ecotypic differentiation and plant adaptation to harsh environments.

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“…quitensis became an interesting subject of morphophysiological investigations aiming to identify ecotypic variation (Gianoli et al 2004), to analyze its reproduction performance (Giełwanowska et al 2011;Sanhueza et al 2017) or identify the characteristic endophytic fungal communities (Santiago et al 2012(Santiago et al , 2017. Moreover, as the only representative of Magnoliopsida that grows in the extreme environmental conditions of the Antarctic, C. quitensis was extensively studied in terms of the morphological, physiological, and biochemical basis of adaptation to extremely cold climate, ample thermal oscillations, short vegetation season, high UV-B radiation, and salinity (Bravo et al 2007;Bascunan-Godoy et al 2012;Navarrete-Gallegos et al 2012;Cuba-Díaz et al 2017a). In contrast, the genetic diversity of this species is still poorly studied and deserves more attention.…”

Section: Genetic Diversity and Differentiation Of Colobanthus Quitensismentioning

confidence: 99%

Range-wide pattern of genetic variation in Colobanthus quitensis

et al. 2018

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There is only one species representing Magnoliopsida which is considered as native to the Antarctic, i.e., Antarctic pearlwort (Colobanthus quitensis). Although it was intensively studied toward the morphophysiological adaptation to extreme environmental conditions of that area, there is still a lack of sufficient data on its genetic variability. Nine C. quitensis populations from Chile and the Maritime Antarctic were sampled to estimate the pattern of genetic variation in relation to the geographic distribution of analyzed populations and postglacial history of the species. The retrotransposon-based DNA marker system used in our studies appeared to be effective in revealing genetic polymorphism between individuals and genetic differentiation among populations. Although the level of polymorphism was low (9.57%), the Analysis of Molecular Variance showed that overall population differentiation was high (F ST = 0.6241) and revealed significant differentiation between the Northern and Southern Group of populations as well as the population from Conguillio Park. The observed genetic subdivision of C. quitensis populations was confirmed by Bayesian clustering and results of Principal Coordinates Analysis. The Southern Group of populations was characterized by generally higher genetic diversity, which was expressed by the values of the effective number of alleles, expected heterozygosity and by the distribution of private alleles. Our results suggest that the species may have survived the Last Glacial Maximum in refugia located both on the South American continent and in geographically isolated islands of the Maritime Antarctic, i.e., they support the concept of the multiregional origin of C. quitensis in Antarctica.

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Respuestas antioxidantes en dos ecotipos de Colobanthus quitensis (Caryophyllaceae) expuestos a alta radiación UV-B y baja temperatura

Cited by 9 publications

References 21 publications

How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story

How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story

Calcium Oxalate Crystals in Leaves of the Extremophile Plant Colobanthus quitensis (Kunth) Bartl. (Caryophyllaceae)

Range-wide pattern of genetic variation in Colobanthus quitensis

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