Mesophyll conductance to CO2 is the most significant limitation to photosynthesis at different temperatures and water availabilities in Antarctic vascular species

Sáez, Patricia L.; Galmés, Jeroni; Ramírez, Constanza F.; Poblete, Leticia; Rivera, Betsy K.; Cavieres, Lohengrin A.; Clemente‐Moreno, María José; Flexas, Jaume; Bravo, León A.

doi:10.1016/j.envexpbot.2018.09.008

Cited by 26 publications

(16 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of low temperatures on photosynthesis in the Antarctic species studied here was mainly driven by diffusional limitations, rather than biochemical ones, as has been reported for Antarctic vascular plants (Saéz et al, 2018) and by other important environmental stresses such as water stress (Flexas Kappen et al, 1989 30 O 2 evolution Wilson, 1990 0-10 Net CO 2 uptake Davey and Rothery, 1997 10 Net CO 2 uptake Block et al, 2009 20-25 Net CO 2 uptake Present study 19-23 ETR Present study Tortula saxicola 10-20 Net CO 2 uptake Davey and Rothery, 1997 Warnstorfia sarmentosum ≥20 Net CO 2 uptake Block et al, 2009 *Data from Nakatsubo (2002) and Kallio and Heinonen (1975) are excluded because measurements of over-watered samples were clearly performed at non-steady state conditions and variation of CO 2 assimilation might be associated with a variation of interstitial water during measurements rather than with temperature. Nadal and Flexas, 2018).…”

Section: A B D Csupporting

confidence: 67%

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

et al. 2020

Self Cite

View full text Add to dashboard Cite

The terrestrial flora of Antarctica's frozen continent is restricted to sparse ice-free areas and dominated by lichens and bryophytes. These plants frequently battle sub-zero temperatures, extreme winds and reduced water availability; all influencing their ability to survive and grow. Antarctic mosses, however, can have canopy temperatures well above air temperature. At midday, canopy temperatures can exceed 15°C, depending on moss turf water content. In this study, the optimum temperature of photosynthesis was determined for six Antarctic moss species: Bryum pseudotriquetrum, Ceratodon purpureus, Chorisodontium aciphyllum, Polytrichastrum alpinum, Sanionia uncinata, and Schistidium antarctici collected from King George Island (maritime Antarctica) and/ or the Windmill Islands, East Antarctica. Both chlorophyll fluorescence and gas exchange showed maximum values of electron transport rate occurred at canopy temperatures higher than 20°C. The optimum temperature for both net assimilation of CO 2 and photoprotective heat dissipation of three East Antarctic species was 20-30°C and at temperatures below 10°C, mesophyll conductance did not significantly differ from 0. Maximum mitochondrial respiration rates occurred at temperatures higher than 35°C and were lower by around 80% at 5°C. Despite the extreme cold conditions that Antarctic mosses face over winter, the photosynthetic apparatus appears optimised to warm temperatures. Our estimation of the total carbon balance suggests that survival in this cold environment may rely on a capacity to maximize photosynthesis for brief periods during summer and minimize respiratory carbon losses in cold conditions.

show abstract

Section: A B D Csupporting

confidence: 67%

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Most of the studies characterizing the main physiological and biochemical drivers ( g s , g m , and Rubisco) at low temperatures have been performed in crops and model plants (Ort et al, ; Perdomo, Carmo‐Silva, Hermida‐Carrera, Flexas, & Galmés, ; Xiong et al, ; Yamori, Hikosaka, & Way, ). Recent studies with DA showed that both in the field conditions and at lab conditions when plants growing at 15°C where exposed to 10°C, g m was the most relevant photosynthetic limitation (Sáez et al, ; Sáez et al, ). Studies carried out with other species have shown that g m reduced more drastically than g s at low temperatures (von Caemmerer & Evans, ; Warren, ; Warren & Dreyer, ; Yamori, Suzuki, Noguchi, Nakai, & Terashima, ).…”

Section: Discussionmentioning

confidence: 99%

Low‐temperature tolerance of the Antarctic species Deschampsia antarctica: A complex metabolic response associated with nutrient remobilization

Clemente‐Moreno

Omranian

Sáez

et al. 2020

Plant Cell & Environment

Self Cite

View full text Add to dashboard Cite

The species Deschampsia antarctica (DA) is one of the only two native vascular species that live in Antarctica. We performed ecophysiological, biochemical, and metabolomic studies to investigate the responses of DA to low temperature. In parallel, we assessed the responses in a non-Antarctic reference species (Triticum aestivum [TA]) from the same family (Poaceae). At low temperature (4 C), both species showed lower photosynthetic rates (reductions were 70% and 80% for DA and TA, respectively) and symptoms of oxidative stress but opposite responses of antioxidant enzymes (peroxidases and catalase). We employed fused least absolute shrinkage and selection operator statistical modelling to associate the species-dependent physiological and antioxidant responses to primary metabolism. Model results for DA indicated associations with M. J. Clemente-Moreno and N. Omranian contributed equally to this work.

show abstract

“…The only two native vascular plants of Antarctica (Figure c) have been extensively studied in terms of temperature, water availability and nutrient deficiency (Sáez et al , , ,b; Clemente‐Moreno et al , , ). Interestingly, for both species, g m is the most important limitation under low temperature, drought and nutrient deficiency, as has been previously reported for species from semiarid‐arid environments (Galmés et al , ).…”

Section: Photosynthesis In Extreme Environments: Taking Advantage Of mentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Mesophyll conductance to CO2 is the most significant limitation to photosynthesis at different temperatures and water availabilities in Antarctic vascular species

Cited by 26 publications

References 68 publications

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

Low‐temperature tolerance of the Antarctic species Deschampsia antarctica: A complex metabolic response associated with nutrient remobilization

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

Contact Info

Product

Resources

About