Oxygen consumption during leaf nitrate assimilation in a C<sub>3</sub> and C<sub>4</sub> plant: the role of mitochondrial respiration

Bloom, Arnold J.

doi:10.1111/j.1365-3040.2004.01257.x

Cited by 37 publications

(24 citation statements)

References 26 publications

(29 reference statements)

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“…A number of experimental studies (Searles and Bloom, 2003;Cousins and Bloom, 2004;Rachmilevitch et al, 2004) showed that the AQ was about 0.1 higher for growth on NH 3 compared with NO 3 in ambient atmospheric conditions for wheat, maize, tomato (Solanum lycopersicum), and Arabidopsis, in agreement with our calculation for rice. However, the lower AQ for NO 3 was not seen under conditions where photorespiration was suppressed, such as elevated CO 2 or reduced O 2 , and NO 3 assimilation was reduced.…”

Section: Quantum Demand and Photosynthetic Yieldsupporting

confidence: 80%

Responses to Light Intensity in a Genome-Scale Model of Rice Metabolism

et al. 2013

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We describe the construction and analysis of a genome-scale metabolic model representing a developing leaf cell of rice (Oryza sativa) primarily derived from the annotations in the RiceCyc database. We used flux balance analysis to determine that the model represents a network capable of producing biomass precursors (amino acids, nucleotides, lipid, starch, cellulose, and lignin) in experimentally reported proportions, using carbon dioxide as the sole carbon source. We then repeated the analysis over a range of photon flux values to examine responses in the solutions. The resulting flux distributions show that (1) redox shuttles between the chloroplast, cytosol, and mitochondrion may play a significant role at low light levels, (2) photorespiration can act to dissipate excess energy at high light levels, and (3) the role of mitochondrial metabolism is likely to vary considerably according to the balance between energy demand and availability. It is notable that these organelle interactions, consistent with many experimental observations, arise solely as a result of the need for mass and energy balancing without any explicit assumptions concerning kinetic or other regulatory mechanisms.

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Section: Quantum Demand and Photosynthetic Yieldsupporting

confidence: 80%

Responses to Light Intensity in a Genome-Scale Model of Rice Metabolism

et al. 2013

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“…4). Assimilation of NO 3 2 expends about 25% of carbon catabolism, whereas that of NH 4 + expends about 3% (Bloom et al, 1992;Cousins and Bloom, 2004). Therefore, it is expected that CO 2 inhibition of NO 3 2 assimilation would produce observable changes in respiratory gas fluxes.…”

Section: Discussionmentioning

confidence: 99%

Responses of Arabidopsis and Wheat to Rising CO₂ Depend on Nitrogen Source and Nighttime CO₂ Levels

2015

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A major contributor to the global carbon cycle is plant respiration. Elevated atmospheric CO 2 concentrations may either accelerate or decelerate plant respiration for reasons that have been uncertain. We recently established that elevated CO 2 during the daytime decreases plant mitochondrial respiration in the light and protein concentration because CO 2 slows the daytime conversion of nitrate (NO 3 2 ) into protein. This derives in part from the inhibitory effect of CO 2 on photorespiration and the dependence of shoot NO 3 2 assimilation on photorespiration. Elevated CO 2 also inhibits the translocation of nitrite into the chloroplast, a response that influences shoot NO 3 2 assimilation during both day and night. Here, we exposed Arabidopsis (Arabidopsis thaliana) and wheat (Triticum aestivum) plants to daytime or nighttime elevated CO 2 and supplied them with NO 3 2 or ammonium as a sole nitrogen (N) source. Six independent measures (plant biomass, shoot NO 3 2 , shoot organic N, 15 N isotope fractionation, 15 NO 3 2 assimilation, and the ratio of shoot CO 2 evolution to O 2 consumption) indicated that elevated CO 2 at night slowed NO 3 2 assimilation and thus decreased dark respiration in the plants reliant on NO 3 2. These results provide a straightforward explanation for the diverse responses of plants to elevated CO 2 at night and suggest that soil N source will have an increasing influence on the capacity of plants to mitigate human greenhouse gas emissions.

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“…This supports the hypothesis that $NO_{3}^{-}$ assimilation in C 3 plants depends on photorespiration . By contrast, shoot $\hbox{NO}_{3}^{-}$ assimilation in C 4 plants proves relatively insensitive to CO 2 levels (maize,12, 27 Flaveria bidentis and Amaranthus retroflexus (Bloom AJ, unpublished)). Therefore photorespiration and the C 4 pathway appear to have a previously unrecognised function: they shuttle chemical energy between organelles to convert $\hbox{NO}_{3}^{-}$ into amino acids.…”

Section: The Discoverymentioning

confidence: 99%

“…We recently discovered a key interaction between biochemical pathways in plants for carbon metabolism and conversion of inorganic nitrogen into amino acids 9–12. This interaction may account for much of the variation in plant responses to elevated CO 2 concentrations.…”

mentioning

confidence: 99%

Rising carbon dioxide concentrations and the future of crop production

Bloom

2006

J Sci Food Agric

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Oxygen consumption during leaf nitrate assimilation in a C₃ and C₄ plant: the role of mitochondrial respiration

Abstract: ABSTRACT

Cited by 37 publications

References 26 publications

Responses to Light Intensity in a Genome-Scale Model of Rice Metabolism

Responses to Light Intensity in a Genome-Scale Model of Rice Metabolism

Responses of Arabidopsis and Wheat to Rising CO₂ Depend on Nitrogen Source and Nighttime CO₂ Levels

Rising carbon dioxide concentrations and the future of crop production

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Oxygen consumption during leaf nitrate assimilation in a C3 and C4 plant: the role of mitochondrial respiration

Abstract: ABSTRACT

Cited by 37 publications

References 26 publications

Responses to Light Intensity in a Genome-Scale Model of Rice Metabolism

Responses to Light Intensity in a Genome-Scale Model of Rice Metabolism

Responses of Arabidopsis and Wheat to Rising CO2 Depend on Nitrogen Source and Nighttime CO2 Levels

Rising carbon dioxide concentrations and the future of crop production

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Product

Resources

About

Oxygen consumption during leaf nitrate assimilation in a C₃ and C₄ plant: the role of mitochondrial respiration

Responses of Arabidopsis and Wheat to Rising CO₂ Depend on Nitrogen Source and Nighttime CO₂ Levels