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Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L.

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Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L. / Bailey, Karen J.; Battistelli, Alberto; Dever, Louisa V. et al.
In: Journal of Experimental Botany, Vol. 51, No. Specia, 02.2000, p. 339-346.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Bailey, KJ, Battistelli, A, Dever, LV, Lea, PJ & Leegood, RC 2000, 'Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L.', Journal of Experimental Botany, vol. 51, no. Specia, pp. 339-346. https://doi.org/10.1093/jexbot/51.suppl_1.339

APA

Vancouver

Bailey KJ, Battistelli A, Dever LV, Lea PJ, Leegood RC. Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L. Journal of Experimental Botany. 2000 Feb;51(Specia):339-346. doi: 10.1093/jexbot/51.suppl_1.339

Author

Bailey, Karen J. ; Battistelli, Alberto ; Dever, Louisa V. et al. / Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L. In: Journal of Experimental Botany. 2000 ; Vol. 51, No. Specia. pp. 339-346.

Bibtex

@article{f3d3092e900c4a03a9af2f7c527a892e,
title = "Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L.",
abstract = "Heterozygous mutants of Amaranthus edulis deficient in PEP carboxylase (PEPC) have been used to study the control of photosynthetic carbon assimilation. A reduction in PEPC activity led to a decrease in the initial slope of the relationship between the CO2 assimilation rate and the intercellular CO2 concentration and to a decrease in photosynthesis at high light intensities, consistent with a decrease in the capacity of the C4 cycle in high light. PEPC exerted appreciable control on photosynthetic flux in the wild-type, with a relatively high flux control coefficient of 0.35 in saturating light and ambient CO2. The flux control coefficient was decreased in low light or increased in low CO2 or in plants containing lower PEPC activity. However, the rate of CO2 assimilation decreased down to about 55% PEPC, followed by an up-turn in the light-saturated photosynthetic rate as PEPC was further reduced, suggesting the existence of a mechanism that compensates for the loss of PEPC activity. The amounts of photosynthetic metabolites, including glycine and serine, also showed a biphasic response to decreasing PEPC. There was a linear relationship between the activity of PEPC and the activation state of the enzyme. A possible mechanism of compensation involving photorespiratory intermediates is discussed.",
keywords = "C4 plants, Amaranthus edulis, phosphoenolpyruvate carboxylase, CO2 assimilation, control of photosynthesis.",
author = "Bailey, {Karen J.} and Alberto Battistelli and Dever, {Louisa V.} and Lea, {Peter John} and Leegood, {Richard C.}",
year = "2000",
month = feb,
doi = "10.1093/jexbot/51.suppl_1.339",
language = "English",
volume = "51",
pages = "339--346",
journal = "Journal of Experimental Botany",
issn = "1460-2431",
publisher = "OXFORD UNIV PRESS",
number = "Specia",

}

RIS

TY - JOUR

T1 - Control of C4 photosynthesis: effects of reduced activities of phosphoenolpyruvate carboxylase on CO2 assimilation in Amaranthus edulis L.

AU - Bailey, Karen J.

AU - Battistelli, Alberto

AU - Dever, Louisa V.

AU - Lea, Peter John

AU - Leegood, Richard C.

PY - 2000/2

Y1 - 2000/2

N2 - Heterozygous mutants of Amaranthus edulis deficient in PEP carboxylase (PEPC) have been used to study the control of photosynthetic carbon assimilation. A reduction in PEPC activity led to a decrease in the initial slope of the relationship between the CO2 assimilation rate and the intercellular CO2 concentration and to a decrease in photosynthesis at high light intensities, consistent with a decrease in the capacity of the C4 cycle in high light. PEPC exerted appreciable control on photosynthetic flux in the wild-type, with a relatively high flux control coefficient of 0.35 in saturating light and ambient CO2. The flux control coefficient was decreased in low light or increased in low CO2 or in plants containing lower PEPC activity. However, the rate of CO2 assimilation decreased down to about 55% PEPC, followed by an up-turn in the light-saturated photosynthetic rate as PEPC was further reduced, suggesting the existence of a mechanism that compensates for the loss of PEPC activity. The amounts of photosynthetic metabolites, including glycine and serine, also showed a biphasic response to decreasing PEPC. There was a linear relationship between the activity of PEPC and the activation state of the enzyme. A possible mechanism of compensation involving photorespiratory intermediates is discussed.

AB - Heterozygous mutants of Amaranthus edulis deficient in PEP carboxylase (PEPC) have been used to study the control of photosynthetic carbon assimilation. A reduction in PEPC activity led to a decrease in the initial slope of the relationship between the CO2 assimilation rate and the intercellular CO2 concentration and to a decrease in photosynthesis at high light intensities, consistent with a decrease in the capacity of the C4 cycle in high light. PEPC exerted appreciable control on photosynthetic flux in the wild-type, with a relatively high flux control coefficient of 0.35 in saturating light and ambient CO2. The flux control coefficient was decreased in low light or increased in low CO2 or in plants containing lower PEPC activity. However, the rate of CO2 assimilation decreased down to about 55% PEPC, followed by an up-turn in the light-saturated photosynthetic rate as PEPC was further reduced, suggesting the existence of a mechanism that compensates for the loss of PEPC activity. The amounts of photosynthetic metabolites, including glycine and serine, also showed a biphasic response to decreasing PEPC. There was a linear relationship between the activity of PEPC and the activation state of the enzyme. A possible mechanism of compensation involving photorespiratory intermediates is discussed.

KW - C4 plants

KW - Amaranthus edulis

KW - phosphoenolpyruvate carboxylase

KW - CO2 assimilation

KW - control of photosynthesis.

U2 - 10.1093/jexbot/51.suppl_1.339

DO - 10.1093/jexbot/51.suppl_1.339

M3 - Journal article

VL - 51

SP - 339

EP - 346

JO - Journal of Experimental Botany

JF - Journal of Experimental Botany

SN - 1460-2431

IS - Specia

ER -