Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light.

Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light. Research Abstract Details 

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Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light. Abstract Text:

Youshi Tazoe,Yuko T Hanba,Tsuyoshi Furumoto,Ko Noguchi,Ichiro Terashima,

In C(4) photosynthesis, a part of CO(2) fixed by phosphoenolpyruvate carboxylase (PEPC) leaks from the bundle-sheath cells. Because the CO(2) leak wastes ATP consumed in the C(4) cycle, the leak may decrease the efficiency of CO(2) assimilation. To examine this possibility, we studied the light dependence of CO(2) leakiness (varphi), estimated by the concurrent measurements of gas exchange and carbon isotope discrimination, initial activities of ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) and pyruvate, orthophosphate dikinase (PPDK), the phosphorylation state of PEPC and the CO(2) assimilation rate using leaves of Amaranthus cruentus (NAD-malic enzyme subtype, dicot) plants grown in high light (HL) and low light (LL). varphi was constant at photon flux densities (PFDs) >200 mumol m(-2) s(-1) and was around 0.3. At PFDs <150 mumol m(-2) s(-1), varphi increased markedly as PFD decreased. At 40 mumol m(-2) s(-1), varphi was 0.76 in HL and 0.55 in LL leaves, indicating that the efficiency of CO(2) assimilation at low PFD was greater in LL leaves. The activities of Rubisco and PPDK, and the phosphorylated state of PEPC all decreased as PFD decreased. Theoretical calculations with a mathematical model clearly showed that the increase in varphi with decreasing PFD contributed to the decrease in the CO(2) assimilation rate. It was also shown that the 'conventional' quantum yield of photosynthesis obtained by fitting the straight line to the light response curve of the CO(2) assimilation rate at the low PFD region is seriously overestimated. Ecological implications of the increase in varphi in LL are discussed.

Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light. Publishing Authors By Initials

Y Tazoe,YT Hanba,T Furumoto,K Noguchi,I Terashima,

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Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Plant & cell physiology

VOLUME: 49

Page Numbers: 19-29

Journal Abbreviation: Plant Cell Physiol.

ISSN: 0032-0781

DAY: 20

MONTH: 11

YEAR: 2007

Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light. Information

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LANGUAGE: eng

NlmUniqueID: 9430925

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Grant and Affiliation Information for Relationships Between Quantum Yield for CO2 Assimilation, Activity of Key Enzymes and CO2 Leakiness in Amaranthus cruentus, a C4 Dicot, Grown in High or Low Light.

AFFILIATION: Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033 Japan.

Country: Japan

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MEDLINETA: Plant Cell Physiol

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