Temperature response of in vivo <scp>R</scp>ubisco kinetics and mesophyll conductance in Arabidopsis thaliana: comparisons to Nicotiana tabacum

Walker, Berkley J.; Ariza, Loren S.; Kaines, Sarah; Badger, Murray R.; Cousins, Asaph B.

doi:10.1111/pce.12166

Cited by 139 publications

(253 citation statements)

References 64 publications

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“…Mesophyll conductance was originally shown to increase with temperature in tobacco (9), but subsequent studies found that the temperature response of mesophyll conductance is not consistent among species (78,80). These experiments suggest that mesophyll conductance generally increases with temperature in warm-adapted plants but remains fairly constant in more temperate-adapted species.…”

Section: The Response Of Photorespiration To Temperaturementioning

confidence: 94%

The Costs of Photorespiration to Food Production Now and in the Future

Walker

VanLoocke

Bernacchi

et al. 2016

Annu. Rev. Plant Biol.

286

190

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Photorespiration is essential for C 3 plants but operates at the massive expense of fixed carbon dioxide and energy. Photorespiration is initiated when the initial enzyme of photosynthesis, ribulose-1,5-bisphosphate carboxylase/ oxygenase (Rubisco), reacts with oxygen instead of carbon dioxide and produces a toxic compound that is then recycled by photorespiration. Photorespiration can be modeled at the canopy and regional scales to determine its cost under current and future atmospheres. A regional-scale model reveals that photorespiration currently decreases US soybean and wheat yields by 36% and 20%, respectively, and a 5% decrease in the losses due to photorespiration would be worth approximately $500 million annually in the United States. Furthermore, photorespiration will continue to impact yield under future climates despite increases in carbon dioxide, with models suggesting a 12-55% improvement in gross photosynthesis in the absence of photorespiration, even under climate change scenarios predicting the largest increases in atmospheric carbon dioxide concentration. Although photorespiration is tied to other important metabolic functions, the benefit of improving its efficiency appears to outweigh any potential secondary disadvantages.

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Section: The Response Of Photorespiration To Temperaturementioning

confidence: 94%

The Costs of Photorespiration to Food Production Now and in the Future

Walker

VanLoocke

Bernacchi

et al. 2016

Annu. Rev. Plant Biol.

286

190

View full text Add to dashboard Cite

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“…Where G* is the CO 2 compensation point in the absence of R day corrected for the leaf temperature following Walker et al (2013). As J is constant above C ic , the best g m corresponds to the value that minimizes the variance ∑ n i¼1 ðJa 2 JiÞ 2 ðn 2 1Þ , where J a is the average value of J and J i is the value for J for each calculated C j .…”

Section: Estimating Photosynthetic Capacities and Limitationsmentioning

confidence: 99%

Importance of Fluctuations in Light on Plant Photosynthetic Acclimation

et al. 2017

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The acclimation of plants to light has been studied extensively, yet little is known about the effect of dynamic fluctuations in light on plant phenotype and acclimatory responses. We mimicked natural fluctuations in light over a diurnal period to examine the effect on the photosynthetic processes and growth of Arabidopsis (Arabidopsis thaliana). High and low light intensities, delivered via a realistic dynamic fluctuating or square wave pattern, were used to grow and assess plants. Plants subjected to square wave light had thicker leaves and greater photosynthetic capacity compared with fluctuating light-grown plants. This, together with elevated levels of proteins associated with electron transport, indicates greater investment in leaf structural components and photosynthetic processes. In contrast, plants grown under fluctuating light had thinner leaves, lower leaf light absorption, but maintained similar photosynthetic rates per unit leaf area to square wave-grown plants. Despite high light use efficiency, plants grown under fluctuating light had a slow growth rate early in development, likely due to the fact that plants grown under fluctuating conditions were not able to fully utilize the light energy absorbed for carbon fixation. Diurnal leaf-level measurements revealed a negative feedback control of photosynthesis, resulting in a decrease in total diurnal carbon assimilated of at least 20%. These findings highlight that growing plants under square wave growth conditions ultimately fails to predict plant performance under realistic light regimes and stress the importance of considering fluctuations in incident light in future experiments that aim to infer plant productivity under natural conditions in the field.In the natural environment, plants experience a range of light intensities and spectral properties due to changes in sun angle and cloud cover in addition to shading from overlapping leaves and neighboring plants. Therefore, leaves are subjected to spatial and temporal gradients in incident light, which has major consequences for photosynthetic carbon assimilation (Pearcy, 1990;Chazdon and Pearcy, 1991;Pearcy and Way, 2012). As light is the key resource for photosynthesis, plants acclimate to the light environment under which they are grown to maintain performance and fitness. Acclimation involves altering metabolic processes (including light harvesting and CO 2 capture) brought about by a range of mechanisms, from adjustments to leaf morphology to changes in photosynthetic apparatus stoichiometry (Terashima et al., 2006;Athanasiou et al., 2010;Kono and Terashima, 2014), all of which impact on photosynthesis. The primary determinant of crop yield is the cumulative rate of photosynthesis over the growing season, which is regulated by the amount of light captured by the plant and the ability of the plant to efficiently use this energy to convert CO 2 into biomass and harvestable yield (Sinclair and Muchow, 1999). Currently, considerable research efforts in plant biology focus on improving performance,...

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“…For CEF modeling from v c and v o under low light, Equations 2 and 3 were parameterized with the in vivo Rubisco kinetics for Arabidopsis presented previously (Walker et al, 2013) and V cmax calculated from the initial slope of A-C i curves reported in Table I , as measured in hydroponically grown Arabidopsis grown under similar conditions (A. Gandin, unpublished data). For high-light treatments, rates of CEF were predicted in two ways: (1) from v c and v o using Equations 2 and 3, and (2) using Equations 9 and 10 from gas exchange parameterized with G* and R d for each feeding form.…”

Section: Cyclic and Linear Electron Flow Modelingmentioning

confidence: 99%

The Response of Cyclic Electron Flow around Photosystem I to Changes in Photorespiration and Nitrate Assimilation

Walker

Strand²,

Kramer³

et al. 2014

Plant Physiol.

Self Cite

122

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Photosynthesis captures light energy to produce ATP and NADPH. These molecules are consumed in the conversion of CO 2 to sugar, photorespiration, and NO 3 2 assimilation. The production and consumption of ATP and NADPH must be balanced to prevent photoinhibition or photodamage. This balancing may occur via cyclic electron flow around photosystem I (CEF), which increases ATP/NADPH production during photosynthetic electron transport; however, it is not clear under what conditions CEF changes with ATP/NADPH demand. Measurements of chlorophyll fluorescence and dark interval relaxation kinetics were used to determine the contribution of CEF in balancing ATP/NADPH in hydroponically grown Arabidopsis (Arabidopsis thaliana) supplied different forms of nitrogen (nitrate versus ammonium) under changes in atmospheric CO 2 and oxygen. Measurements of CEF were made under low and high light and compared with ATP/NADPH demand estimated from CO 2 gas exchange. Under low light, contributions of CEF did not shift despite an up to 17% change in modeled ATP/NADPH demand. Under high light, CEF increased under photorespiratory conditions (high oxygen and low CO 2 ), consistent with a primary role in energy balancing. However, nitrogen form had little impact on rates of CEF under high or low light. We conclude that, according to modeled ATP/ NADPH demand, CEF responded to energy demand under high light but not low light. These findings suggest that other mechanisms, such as the malate valve and the Mehler reaction, were able to maintain energy balance when electron flow was low but that CEF was required under higher flow.Photosynthesis must balance both the amount of energy harvested by the light reactions and how it is stored to match metabolic demands. Light energy is harvested by the photosynthetic antenna complexes and stored by the electron and proton transfer complexes as ATP and NADPH. It is used primarily to meet the energy demands for assimilating carbon (from CO 2 ) and nitrogen (from NO 3 2 and NH 4 + ; Keeling et al., 1976;Edwards and Walker, 1983;Miller et al., 2007). These processes require different ratios of ATP and NADPH, requiring a finely balanced output of energy in these forms. For example, if ATP were to be consumed at a greater rate than NADPH, electron transport would rapidly become limiting by the lack of NADP + , decreasing rates of proton translocation and ATP regeneration. Alternatively, if NADPH were consumed faster than ATP, proton translocation through ATP synthase would be reduced due to limiting ADP and the difference in pH between lumen and stroma would increase, restricting plastoquinol oxidation at the cytochrome b 6 f complex and initiating nonphotochemical quenching (Kanazawa and Kramer, 2002). The stoichiometric balancing of ATP and NADPH must occur rapidly, because pool sizes of ATP and NADPH are relatively small and fluxes through primary metabolism are large (Noctor and Foyer, 2000;Avenson et al., 2005;Cruz et al., 2005;Amthor, 2010).The balancing of ATP and NADPH supply is further complicated...

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Temperature response of in vivo Rubisco kinetics and mesophyll conductance in Arabidopsis thaliana: comparisons to Nicotiana tabacum

Cited by 139 publications

References 64 publications

The Costs of Photorespiration to Food Production Now and in the Future

The Costs of Photorespiration to Food Production Now and in the Future

Importance of Fluctuations in Light on Plant Photosynthetic Acclimation

The Response of Cyclic Electron Flow around Photosystem I to Changes in Photorespiration and Nitrate Assimilation

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