Molecular biology of the C3 photosynthetic carbon reduction cycle

Raines, Christine A.; Lloyd, Julie C.; Dyer, Tristan A.

doi:10.1007/bf00029971

Cited by 46 publications

(79 citation statements)

References 109 publications

(61 reference statements)

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“…In recent years there has been rapid advance in our understanding of the molecular biology of enzymes involved in photosynthetic carbon reduction (Raines et al 1991). Many of the genes are regulated by light and expressed in a tissue dependent and developmentally regulated manner (Raines et al 1991).…”

Section: Molecular Basis For a C A Effect On Photosynthetic Gene Exprmentioning

confidence: 99%

Acclimation of photosynthetic proteins to rising atmospheric CO2

1994

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In this review we discuss how the photosynthetic apparatus, particularly Rubisco, acclimates to rising atmospheric CO2 concentrations (ca). Elevated ca alters the control exerted by different enzymes of the Calvin cycle on the overall rate of photosynthetic CO2 assimilation, so altering the requirement for different functional proteins. A decreased flux of carbon through the photorespiratory pathway will decrease requirements for these enzymes. From modeling of the response of CO2 uptake (A) to intracellular CO2 concentration (ci) it is shown that the requirement for Rubisco is decreased at elevated ca, whilst that for proteins limiting ribulose 1,5 bisphosphate regeneration may be increased. This balance may be altered by other interactions, in particular plasticity of sinks for photoassimilate and nitrogen supply; hypotheses on these interactions are presented. It is speculated that increased accumulation of carbohydrate in leaves developed at elevated ca may signal the 'down regulation' of Rubisco. The molecular basis of this 'down regulation' is discussed in terms of the repression of photosynthetic gene expression by the elevated carbohydrate concentrations. This molecular model is then used to predict patterns of acclimation of perennials to long term growth in elevated ca.

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Section: Molecular Basis For a C A Effect On Photosynthetic Gene Exprmentioning

confidence: 99%

Acclimation of photosynthetic proteins to rising atmospheric CO2

1994

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“…Highest activities were found in mature green leaf tissue, with low amounts in etiolated (dark-grown) tissue and either absent or below the level of detection in root nuclear extracts. In each case this correlates with PCR cycle mRNA levels (FBPase, PRKase and phosphoglycerate kinase) [ 18] which follow the expected distribution pattern for chloroplast proteins. PCR enzyme mRNA levels were found to be at least 10-fold higher in light grown than etiolated wheat plants.…”

Section: Discussionmentioning

confidence: 54%

“…The establishment of a functional PCR cycle during chloroplast development requires the coordinate synthesis of the eleven enzymes which catalyse the reactions in this complex pathway [ 18,23 ]. It is likely that a significant proportion of the control of this process is at the level of transcription.…”

Section: Discussionmentioning

confidence: 99%

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A light- and developmentally-regulated DNA-binding interaction is common to the upstream sequences of the wheat Calvin cycle bisphosphatase genes

et al. 1993

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We have characterised a DNA-binding interaction common to the upstream sequences of the wheat fructose-1,6-bisphosphatase (FBPase) and sedoheptulose-1,7-bisphosphatase (SBPase) genes. The recognition site for this sequence-specific binding activity, designated wheat FBPase factor (WF-1), is located within 125 bp of the transcription start site of each gene. Within these regions there are no sequence motifs similar to those shown to be important for light-regulated expression in other species. The binding activity was not detected in wheat root nuclear extracts, or in pea leaf extracts. There was a higher level of binding activity in light-grown than in dark-grown wheat leaves. The level was also found to decline when light-grown plants were given an extended dark treatment, but could be reinduced by light. Utilising the gradient of developmental maturity which exists within the wheat leaf it was found that WF-1 activity increases during leaf development.

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“…Another motif, GATAAG (at 940), which is the core of the I-box found upstream of many dicot ribulose bisphosphate carboxylase small subunit genes (Gilmartin et al, 1990), was also identified. No consensus TATA box is present, a finding that is also true of the wheat Calvin cycle genes encoding Fru-1,6-bisphosphatase and sedoheptulose-1,7-bisphosphatase (Lloyd et al, 1991;Raines et al, 1992).…”

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confidence: 93%