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Retrospective analysis of biochemical limitations to photosynthesis in 49 species: C4 crops appear still adapted to pre-industrial atmospheric [CO2]

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Retrospective analysis of biochemical limitations to photosynthesis in 49 species : C4 crops appear still adapted to pre-industrial atmospheric [CO2]. / Pignon, C.P.; Long, S.P.

In: Plant, Cell and Environment, Vol. 43, No. 11, 30.11.2020, p. 2606-2622.

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@article{d3dc4ae3854148ddb17b117d6b947ef4,
title = "Retrospective analysis of biochemical limitations to photosynthesis in 49 species: C4 crops appear still adapted to pre-industrial atmospheric [CO2]",
abstract = "Leaf CO2 uptake (A) in C4 photosynthesis is limited by the maximum apparent rate of PEPc carboxylation (Vpmax) at low intercellular [CO2] (ci) with a sharp transition to a ci-saturated rate (Vmax) due to co-limitation by ribulose-1:5-bisphosphate carboxylase/oxygenase (Rubisco) and regeneration of PEP. The response of A to ci has been widely used to determine these two parameters. Vmax and Vpmax depend on different enzymes but draw on a shared pool of leaf resources, such that resource distribution is optimized, and A maximized, when Vmax and Vpmax are co-limiting. We collected published A/ci curves in 49 C4 species and assessed variation in photosynthetic traits between phylogenetic groups, and as a function of atmospheric [CO2]. The balance of Vmax-Vpmax varied among evolutionary lineages and C4 subtypes. Operating A was strongly Vmax-limited, such that re-allocation of resources from Vpmax towards Vmax was predicted to improve A by 12% in C4 crops. This would not require additional inputs but rather altered partitioning of existing leaf nutrients, resulting in increased water and nutrient-use efficiency. Optimal partitioning was achieved only in plants grown at pre-industrial atmospheric [CO2], suggesting C4 crops have not adjusted to the rapid increase in atmospheric [CO2] of the past few decades. ",
keywords = "A/ci curve, C4 photosynthesis, C4 subtype, elevated CO2, pre-industrial CO2, stomatal conductance, Vmax, Vpmax, water-use efficiency",
author = "C.P. Pignon and S.P. Long",
year = "2020",
month = nov,
day = "30",
doi = "10.1111/pce.13863",
language = "English",
volume = "43",
pages = "2606--2622",
journal = "Plant, Cell and Environment",
issn = "0140-7791",
publisher = "Wiley",
number = "11",

}

RIS

TY - JOUR

T1 - Retrospective analysis of biochemical limitations to photosynthesis in 49 species

T2 - C4 crops appear still adapted to pre-industrial atmospheric [CO2]

AU - Pignon, C.P.

AU - Long, S.P.

PY - 2020/11/30

Y1 - 2020/11/30

N2 - Leaf CO2 uptake (A) in C4 photosynthesis is limited by the maximum apparent rate of PEPc carboxylation (Vpmax) at low intercellular [CO2] (ci) with a sharp transition to a ci-saturated rate (Vmax) due to co-limitation by ribulose-1:5-bisphosphate carboxylase/oxygenase (Rubisco) and regeneration of PEP. The response of A to ci has been widely used to determine these two parameters. Vmax and Vpmax depend on different enzymes but draw on a shared pool of leaf resources, such that resource distribution is optimized, and A maximized, when Vmax and Vpmax are co-limiting. We collected published A/ci curves in 49 C4 species and assessed variation in photosynthetic traits between phylogenetic groups, and as a function of atmospheric [CO2]. The balance of Vmax-Vpmax varied among evolutionary lineages and C4 subtypes. Operating A was strongly Vmax-limited, such that re-allocation of resources from Vpmax towards Vmax was predicted to improve A by 12% in C4 crops. This would not require additional inputs but rather altered partitioning of existing leaf nutrients, resulting in increased water and nutrient-use efficiency. Optimal partitioning was achieved only in plants grown at pre-industrial atmospheric [CO2], suggesting C4 crops have not adjusted to the rapid increase in atmospheric [CO2] of the past few decades. 

AB - Leaf CO2 uptake (A) in C4 photosynthesis is limited by the maximum apparent rate of PEPc carboxylation (Vpmax) at low intercellular [CO2] (ci) with a sharp transition to a ci-saturated rate (Vmax) due to co-limitation by ribulose-1:5-bisphosphate carboxylase/oxygenase (Rubisco) and regeneration of PEP. The response of A to ci has been widely used to determine these two parameters. Vmax and Vpmax depend on different enzymes but draw on a shared pool of leaf resources, such that resource distribution is optimized, and A maximized, when Vmax and Vpmax are co-limiting. We collected published A/ci curves in 49 C4 species and assessed variation in photosynthetic traits between phylogenetic groups, and as a function of atmospheric [CO2]. The balance of Vmax-Vpmax varied among evolutionary lineages and C4 subtypes. Operating A was strongly Vmax-limited, such that re-allocation of resources from Vpmax towards Vmax was predicted to improve A by 12% in C4 crops. This would not require additional inputs but rather altered partitioning of existing leaf nutrients, resulting in increased water and nutrient-use efficiency. Optimal partitioning was achieved only in plants grown at pre-industrial atmospheric [CO2], suggesting C4 crops have not adjusted to the rapid increase in atmospheric [CO2] of the past few decades. 

KW - A/ci curve

KW - C4 photosynthesis

KW - C4 subtype

KW - elevated CO2

KW - pre-industrial CO2

KW - stomatal conductance

KW - Vmax

KW - Vpmax

KW - water-use efficiency

U2 - 10.1111/pce.13863

DO - 10.1111/pce.13863

M3 - Journal article

VL - 43

SP - 2606

EP - 2622

JO - Plant, Cell and Environment

JF - Plant, Cell and Environment

SN - 0140-7791

IS - 11

ER -