Participation of citric acid and isocitric acid in the diurnal cycle of carboxylation and decarboxylation in the common ice plant

Gawrońska, Katarzyna; Niewiadomska, Ewa

doi:10.1007/s11738-015-1807-x

Cited by 9 publications

(5 citation statements)

References 46 publications

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“…This conclusion is further supported by another study in ice plant in which malate, citrate and isocitrate levels and CAM-relevant enzyme activities were measured for the same CAM-inducing conditions 5 . The authors reported malate and citrate levels of up to 27.5 mM and 29.4mM, respectively.…”

Section: Discussionsupporting

confidence: 63%

CAM emerges in a leaf metabolic model under water-saving constraints in different environments

Toepfer

Braam

Shameer

et al. 2020

Preprint

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11Crassulacean Acid Metabolism (CAM) evolved in arid environments as a water-saving 12 alternative to C3 photosynthesis. There is great interest in engineering more drought-resistant 13 crop species by introducing CAM into C3 plants. However, one of the open questions is 14 whether full CAM or alternative water-saving flux modes would be more productive in the 15 environments typically experienced by C3 crops. To study the effect of temperature and 16relative humidity on plant metabolism we coupled a time-resolved diel model of leaf 17 metabolism to an environment-dependent gas-exchange model. This model allowed us to 18 study the emergence of CAM or CAM-like behaviour as a result of a trade-off between leaf 19 productivity and water-saving. We show that vacuolar storage capacity in the leaf is a major 20 determinant of the extent of CAM and shapes the occurrence of phase II and IV of the CAM 21 cycle. Moreover, the model allows us to study alternative flux routes and we identify 22 mitochondrial isocitrate dehydrogenase (ICDH) and an isocitrate-citrate-proline-2OG cycle as 23 a potential contributor to initial carbon fixation at night. Simulations across a wide range of 24 environmental parameters show that the water-saving potential of CAM strongly depends on 25 the environment and that the additional water-saving effect of carbon fixation by ICDH can 26 reach up to 4% for the conditions tested. 27 28 An optimality study reveals trade-offs between productivity and WUE 131Computationally, the question of how a system's behaviour changes when operating between 132 competing objectives can be tackled by performing a Pareto analysis [16][17][18][19] . In our case phloem 133 output and water-saving represented two competing driving forces. We started the Pareto 134 analysis from the above described scenario of a mature leaf optimized for maximum phloem 135 output (i.e. 100% phloem output, here termed Pareto step 1). We then subsequently reduced 136 the required phloem output in 10%-steps and used minimization of water loss as the primary 137 optimization objective. Given this setup, we saw an almost linear decrease in water loss with 138 decreasing phloem output, hence we did not observe any significant water-saving mechanism 139

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Section: Discussionsupporting

confidence: 63%

CAM emerges in a leaf metabolic model under water-saving constraints in different environments

Toepfer

Braam

Shameer

et al. 2020

Preprint

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“…51,52 However, CO 2 can also be fixated and stored in the form of other organic acids such as citrate, isocitrate, fumarate and succinate. 53,54 During the daytime, when the stomata are closed, the organic acids stored in the vacuole are released into the cytosol and decarboxylated, releasing CO 2 that is converted into carbohydrates by the Calvin-Benson (C 3 ) cycle. 51,52 In this review, this type of photosynthetic metabolism will be addressed on some occasions because it is activated in response to several stresses associated or not with thermal changes.…”

Section: Limit Of Heat Tolerance In Plantsmentioning

confidence: 99%

Rapid responses of plants to temperature changes

et al. 2017

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Temperature is one of the main environmental factors that affect plant metabolism. Considering that plants are sessile, their survival depends on the efficient activation of resistance responses to thermal stress. In this comprehensive review, we discuss recent work on rapid biochemical and physiological adjustments, herein referred to as those occurring during the first few hours or a few days after the beginning of the change in the ambient temperature. The short-term metabolic modulation after plant exposure to heat and cold, including chilling and freezing, is discussed. Effects on photosynthesis, cell membranes, antioxidant system, production of heat shock proteins and nitric oxide, as well as an overview of signaling events to heat or cold stress are presented. In addition, we also discuss the acclimation process that occurs when the plant acquires resistance to an increase or decrease in temperature, adjusting its homeostasis and steady-state physiology to the new temperatures. Finally, we present studies with tropical plants that aim at elucidating the effects of temperature and the identification of the resilience levels of these plants to the expected climate changes, and which seek the development of techniques for germplasm conservation of endangered species.

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“…Encouraged by that fact, in our previous study we tested if a shift towards CAM photosynthesis performance may be initiated with elevated Cd concentrations as well. The ∆-malate (difference in malate concentration between the beginning and end of the light phase of photoperiod), as well as 13 C discrimination analysis both of which are the hallmarks of functional CAM, revealed no remarks of CAM presence in Cd-treated C 3performing plants, con rming that Cd does not belong to the group of abiotic stress factors capable of inducing CAM photosynthesis (Nosek et al 2019).…”

Section: Discussionmentioning

confidence: 96%

Does Cd possess the stimulatory effect on gas exchange and photochemistry in C3-CAM intermediate plants?

Kaczmarczyk

Nosek

Kaszycki

et al. 2022

Preprint

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The soil-grown semi-halophytic CAM (crassulacean acid metabolism) facultative model plant - Mesembryanthemum crystallinum L. (common ice plant) exhibits minute toxicity symptoms when exposed to elevated cadmium doses. In this study, photochemical activity as well as gas exchange of the soil-grown C3-CAM- performing plants to increased cadmium concentrations (0.01-10.0 mM) were investigated. An increase of net photosynthesis (PN) observed in C3- performing plants upon exposure to Cd runs in parallel with the rise of transpiration level. As the transpiration process tends to be elevated also in darkness, it gives rise to the suggestion that the first effect of Cd presence is stimulation of stomata aperture. Also, photochemical activity is well-secured in Cd-treated plants, which implies the involvement of additional mechanisms triggered to protect M. crystallinum against Cd toxicity.

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Participation of citric acid and isocitric acid in the diurnal cycle of carboxylation and decarboxylation in the common ice plant

Abstract: In this paper we analyzed changes in the concentration of the three carboxylic acids (malic acid, citric acid and isocitric acid) during the salinity-induced C 3

Cited by 9 publications

References 46 publications

CAM emerges in a leaf metabolic model under water-saving constraints in different environments

CAM emerges in a leaf metabolic model under water-saving constraints in different environments

Rapid responses of plants to temperature changes

Does Cd possess the stimulatory effect on gas exchange and photochemistry in C3-CAM intermediate plants?

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