Photorespiratory Carbon and Nitrogen Cycling: Evidence from Studies of Mutant and Transgenic Plants

Keys, A. J.; Leegood, Richard C.

doi:10.1007/0-306-48138-3_8

Cited by 15 publications

(14 citation statements)

References 129 publications

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“…Importantly, when growth is on

{NH}_{4}^{+}

rather than

{NO}_{3}^{-}

, photorespiratory responses to other stress, such as high light and cold temperatures, can increase significantly. When

{NO}_{3}^{-}

is comparatively unavailable to the cell, the sink for NADPH consumption via NR‐catalysed

{NO}_{3}^{-}

reduction is not available, and photorespiration becomes the alternative electron sink (Keys and Leegood ; Guo et al ,b; Nunes‐Nesi et al ). This has been nicely shown in the diatom T. pseudonana , in which genes associated with photorespiration, phosphoglycolate phosphatase (PGP) and T‐protein subunit glycine decarboxylase (GDCT), were up‐regulated when

{NH}_{4}^{+}

, rather than

{NO}_{3}^{-}

, was the N growth substrate and when cells were shifted to higher light (Parker et al ; Parker and Armbrust ; Shi et al ; Fig.…”

Section: Energy Pressure Valves and C And N Assimilation In Diatoms—cmentioning

confidence: 99%

Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

et al. 2015

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Anthropogenic activities are altering total nutrient loads to many estuaries and freshwaters, resulting in high loads not only of total nitrogen (N), but in some cases, of chemically reduced forms, notably NH 4 that promote vs. repress NO -3 uptake, assimilation, and growth in different phytoplankton groups and under different growth conditions are not well understood. Here, we review N metabolism first in a "generic" eukaryotic cell, and the contrasting metabolic pathways and regulation of NH 1 4 and NO 2 3 when these substrates are provided individually under equivalent growth conditions. Then the metabolic interactions of these substrates are described when both are provided together, emphasizing the cellular challenge of balancing nutrient acquisition with photosynthetic energy balance in dynamic environments. Conditions under which dissipatory pathways such as dissimilatory NO 2 3 / NO 2 2 reduction to NH 1 4 and photorespiration that may lead to growth suppression are highlighted. While more is known about diatoms, taxon-specific differences in NH 1 4 and NO 2 3 metabolism that may contribute to changes in phytoplankton community composition when the composition of the N pool changes are presented. These relationships have important implications for harmful algal blooms, development of nutrient criteria for management, and modeling of nutrient uptake by phytoplankton, particularly in conditions where eutrophication is increasing and the redox state of N loads is changing.

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“…Importantly, when growth is on

{NH}_{4}^{+}

rather than

{NO}_{3}^{-}

, photorespiratory responses to other stress, such as high light and cold temperatures, can increase significantly. When

{NO}_{3}^{-}

is comparatively unavailable to the cell, the sink for NADPH consumption via NR‐catalysed

{NO}_{3}^{-}

{NH}_{4}^{+}

, rather than

{NO}_{3}^{-}

, was the N growth substrate and when cells were shifted to higher light (Parker et al ; Parker and Armbrust ; Shi et al ; Fig.…”

Section: Energy Pressure Valves and C And N Assimilation In Diatoms—cmentioning

confidence: 99%

Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

et al. 2015

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“…Photorespiratory metabolism is linked with nitrogen metabolism (Keys and Leegood, 2002), and recent studies have suggested that nitrate assimilation in plant shoots depends on photorespiration (Rachmilevitch e t a l . , 2 0 0 4 ) .…”

Section: Genetic Control Of Photosynthetic Metabolismmentioning

confidence: 99%

“…The oxygenase reaction of Rubisco occurs simultaneously, generating glycolate-2-phosphate, an initial compound of the photorespiratory (glycolate) pathway. The CO 2 released during photorespiration comes from glycine oxidation in the mitochondria by glycine decarboxylase (GDC) (Douce and Heldt, 2000;Wingler et al, 2000;Keys and Leegood, 2002). In C 3 plants, the CO 2 release by photorespiration in ordinary air is estimated to be about 25% of photosynthetically fixed CO 2 , and this loss decreases the efficiency of photosynthesis (Sharkey, 1988).…”

mentioning

confidence: 99%

“…In C 3 plants, the CO 2 release by photorespiration in ordinary air is estimated to be about 25% of photosynthetically fixed CO 2 , and this loss decreases the efficiency of photosynthesis (Sharkey, 1988). Thus, the regulation of photorespiration has been the subject of intense investigation for plant physiologists and agricultural researchers for many decades (reviewed in Zelitch, 1992;Wingler et al, 2000;Keys and Leegood, 2002).…”

mentioning

confidence: 99%

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Inheritance of C₃―C₄Intermediate Photosynthesis in Reciprocal Hybrids BetweenMoricandia Arvensis(C₃―C₄) andBrassica Oleracea(C₃) That Differ in Their Genome Constitution

Ueno

Bang

Wada

et al. 2007

Plant Production Science

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“…Several of the steps of the photorespiratory pathway that were first defined through classical biochemical experiments were later confirmed by the isolation of photorespiratory mutants (Keys and Leegood, 2002). A mutant screening that was first devised to isolate photorespiratory mutants from Arabidopsis (Arabidopsis thaliana) was based on the fact that photorespiratory mutants are conditionally lethal.…”

mentioning

confidence: 99%

Transcriptomic and Metabolic Changes Associated with Photorespiratory Ammonium Accumulation in the Model Legume Lotus japonicus

et al. 2013

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The transcriptomic and metabolic consequences of the lack of plastidic glutamine (Gln) synthetase in the model legume Lotus japonicus were investigated. Wild-type and mutant plants lacking the plastidic isoform of Gln synthetase were grown in conditions that suppress photorespiration and then transferred for different lengths of time to photorespiratory conditions. Transcript and metabolite levels were determined at the different time points considered. Under photorespiratory active conditions, the mutant accumulated high levels of ammonium, followed by its subsequent decline. A coordinate repression of the photorespiratory genes was observed in the mutant background. This was part of a greater modulation of the transcriptome, especially in the mutant, that was paralleled by changes in the levels of several key metabolites. The data obtained for the mutant represent the first direct experimental evidence for a coordinate regulation of photorespiratory genes over time. Metabolomic analysis demonstrated that mutant plants under active photorespiratory conditions accumulated high levels of several amino acids and organic acids, including intermediates of the Krebs cycle. An increase in Gln levels was also detected in the mutant, which was paralleled by an increase in cytosolic Gln synthetase1 gene transcription and enzyme activity levels. The global panoramic of the transcripts and metabolites that changed in L. japonicus plants during the transfer from photorespiration-suppressed to photorespiration-active conditions highlighted the link between photorespiration and several other cellular processes, including central carbon metabolism, amino acid metabolism, and secondary metabolism.

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Photorespiratory Carbon and Nitrogen Cycling: Evidence from Studies of Mutant and Transgenic Plants

Cited by 15 publications

References 129 publications

Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

Inheritance of C₃―C₄Intermediate Photosynthesis in Reciprocal Hybrids BetweenMoricandia Arvensis(C₃―C₄) andBrassica Oleracea(C₃) That Differ in Their Genome Constitution

Transcriptomic and Metabolic Changes Associated with Photorespiratory Ammonium Accumulation in the Model Legume Lotus japonicus

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Photorespiratory Carbon and Nitrogen Cycling: Evidence from Studies of Mutant and Transgenic Plants

Cited by 15 publications

References 129 publications

Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

Inheritance of C3―C4Intermediate Photosynthesis in Reciprocal Hybrids BetweenMoricandia Arvensis(C3―C4) andBrassica Oleracea(C3) That Differ in Their Genome Constitution

Transcriptomic and Metabolic Changes Associated with Photorespiratory Ammonium Accumulation in the Model Legume Lotus japonicus

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Inheritance of C₃―C₄Intermediate Photosynthesis in Reciprocal Hybrids BetweenMoricandia Arvensis(C₃―C₄) andBrassica Oleracea(C₃) That Differ in Their Genome Constitution