Photorespiration and carbon concentrating mechanisms: two adaptations to high O2, low CO2 conditions

Moroney, James V.; Jungnick, Nadine; DiMario, Robert J.; Longstreth, David J.

doi:10.1007/s11120-013-9865-7

Cited by 72 publications

(62 citation statements)

References 93 publications

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“…Compared with the WT and H167R overexpressors, the OsNRT2.3b overexpressors had a higher intercellular CO 2 level and a lower photorespiratory rate in the leaves (SI Appendix, Fig. S15 C and D), which might result in increased biomass and grain yields (40,41) (Fig. 3C and SI Appendix, Fig.…”

Section: Discussionmentioning

confidence: 99%

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Overexpression of a pH-sensitive nitrate transporter in rice increases crop yields

Fan

Tang

Tan

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

324

234

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Fig. 3. Growth, yield, and NUE of OsNRT2.3b, OsNRT2.3a, and H167R mutation overexpressing lines. (A) Phenotypes and transcriptional and translational expression of OsNRT2.3b-and OsNRT2.3a-overexpressing lines and Nipponbare WT. (B) Phenotypes and transcriptional and translational expression of WT and OsNRT2.3b-H167R mutant-overexpressing lines. (C) Average grain yield and NUE of OsNRT2.3b-(O), OsNRT2.3a-(a-O), and H167R-(H167R) overexpressing lines and WT in field plots. RT-PCR with the specific primers (SI Appendix, Table S10) and Western blot analyses with monoclonal antibodies were performed to identify protein expression levels. NUE = grain yield/applied N fertilizer. Values are mean ± SE (n = 3). a and b above bars indicate significant differences (P < 0.05) between the transgenic lines and WT estimated by one-way ANOVA.

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Section: Discussionmentioning

confidence: 99%

“…Another possible explanation is the strong ectopic expression of OsNRT2.3b in leaf mesophyll cells (SI Appendix, Fig. S7G), which may enhance the cytosolic pH balance in leaf mesophyll cells and influence the intercellular dissolved CO 2 level (40).…”

Section: Discussionmentioning

confidence: 99%

Overexpression of a pH-sensitive nitrate transporter in rice increases crop yields

Fan

Tang

Tan

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

324

234

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“…Still many other organisms employ carbonic anhydrases either externally or internally to convert

{HCO}_{3}^{-}

into CO 2 (Moroney et al . ). These processes may locally change the total alkalinity of seawater, further shifting the local relative proportions of dissolved CO 2 ,

{HCO}_{3}^{-}

and

{CO}_{3}^{2 -}

(C. C. Stepien, C. A. Pster & J. T. Wootton, Unpubl.…”

Section: Introductionmentioning

confidence: 97%

Impacts of geography, taxonomy and functional group on inorganic carbon use patterns in marine macrophytes

Stepien

2015

Journal of Ecology

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Summary Carbon uptake in terrestrial plants functions under near‐constant source carbon dioxide (CO2) concentrations and isotopic ratios, but aquatic macrophytes operate in a more complex system where environmental fluxes and biotic interactions undermine assumptions of constant CO2 concentration and 13C/12C. Many marine macrophytes not only passively access CO2 for photosynthesis, but also actively concentrate CO2 and bicarbonate (HCO3−) using carbon concentration mechanisms (CCMs). These processes change macrophyte carbon fractionation signatures (13C/12C) and elevate seawater pH as high as 10.4 in mesocosm pH assays, in which the pH value reached is termed pH*. I assembled a global data set of 2027 marine macrophyte δ13C and pH assay values for 664 species to assess (i) how macrophyte δ13C varies with the abiotic parameters such as sea surface temperature (SST), latitude and habitat, and the organismal traits of taxonomic and functional group membership and (ii) how species δ13C is related to CCM presence or absence, as determined by a pH drift assay. Across 613 macrophyte species, collection site distance from the equator was negatively related to species δ13C, while collection site variance in SST was positively related to species δ13C. Macrophyte tissue δ13C differed among oceans as well as in intertidal versus subtidal habitats. Species from phylum Rhodophyta had the lowest δ13C, and functional group was related to δ13C, largely due to higher δ13C in calcifying species. Analysis of 141 species with paired pH*–δ13C data found that these metrics of CCM presence are not independent. As species δ13C increases so does the probability of species pH* > 9.0, a threshold value of CCM presence in pH assays. Synthesis. CCMs revealed species patterns in communities at every scale investigated, from local emersion gradients to oceanic and global gradients. Trends in macrophyte δ13C values indicate that macrophytes rely more on CO2 further from the equator, but have increased use of HCO3− at sites with high temperature variance, patterns that may be driven by species turnover rather than intraspecific variation. Patterns in species CCMs will be crucial to understanding how macrophyte communities respond to ocean acidification‐induced changes to SST and variability.

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“…PGA: 3-phosphoglycerate; BPGA: 1,3-bisphosphoglycerate; DHAP: dihydroxyacetone phosphate; E4P: erythrose-4-phosphate; F6P: fructose-6-phosphate; FBP: fructose-1,6-bisphosphate; GAP: glyceraldehyde-3-phosphate; Ri5P: ribose-5-phosphate; Ru5P: ribulose-5-phosphate; RuBP: ribulose-1,5-bisphosphate; S7P: sedoheptulose-7-phosphate; SBP: sedoheptulose-1,7-bisphosphate; Xu5P: xylulose-5-phosphate. oxygenase reaction, P-glycolate is metabolized through a series of reactions known as the photorespiratory or C 2 pathway (Tolbert, 1997;Moroney et al, 2013). This pathway is required to remove P-glycolate, a potent inhibitor of triose-P-isomerase, and to recycle some of the carbon back to the C 3 Cycle as 3-PGA (Somerville and Ogren, 1979;Ogren, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, O 2 not only competitively inhibits CO 2 fixation, but also causes a net loss of one CO 2 for every two O 2 fixed. To improve carbon gain, mechanisms for inhibiting photorespiration by concentrating CO 2 around Rubisco have evolved in many types of photoautotrophic organisms, particular those that inhabit aquatic environments (Reiskind et al, 1997;Price, 2011;Wang et al, 2011;Moroney et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Regulation of photosynthetic carbon metabolism in aquatic and terrestrial organisms by Rubisco activase, redox-modulation and CP12

Gontero

Salvucci

2014

Aquatic Botany

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Photorespiration and carbon concentrating mechanisms: two adaptations to high O2, low CO2 conditions

Cited by 72 publications

References 93 publications

Overexpression of a pH-sensitive nitrate transporter in rice increases crop yields

Overexpression of a pH-sensitive nitrate transporter in rice increases crop yields

Impacts of geography, taxonomy and functional group on inorganic carbon use patterns in marine macrophytes

Regulation of photosynthetic carbon metabolism in aquatic and terrestrial organisms by Rubisco activase, redox-modulation and CP12

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