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Loss of photosynthetic efficiency in the shade. An Achilles heel for the dense modern stands of our most productive C4 crops?

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Loss of photosynthetic efficiency in the shade. An Achilles heel for the dense modern stands of our most productive C4 crops? / Pignon, C.P.; Jaiswal, D.; McGrath, J.M.; Long, S.P.

In: Journal of Experimental Botany, Vol. 68, No. 2, 01.01.2017, p. 335-345.

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Pignon, C.P. ; Jaiswal, D. ; McGrath, J.M. ; Long, S.P. / Loss of photosynthetic efficiency in the shade. An Achilles heel for the dense modern stands of our most productive C4 crops?. In: Journal of Experimental Botany. 2017 ; Vol. 68, No. 2. pp. 335-345.

Bibtex

@article{540800be550945148c2315e56e49a150,
title = "Loss of photosynthetic efficiency in the shade. An Achilles heel for the dense modern stands of our most productive C4 crops?",
abstract = "The wild progenitors of major C4 crops grew as individuals subjected to little shading. Today they are grown in dense stands where most leaves are shaded. Do they maintain photosynthetic efficiency in these low light conditions produced by modern cultivation? The apparent maximum quantum yield of CO2 assimilation (φ CO2max, app ), a key determinant of light-limited photosynthesis, has not been systematically studied in field stands of C4 crops. φCO2max, app was derived from the initial slope of the response of leaf CO2 uptake (A) to photon flux (Q). Leaf fractional light absorptance (α) was measured to determine the absolute maximum quantum yield of CO2 assimilation on an absorbed light basis (φCO2max, abs ). Light response curves were determined on sun and shade leaves of 49 field plants of Miscanthus × giganteus and Zea mays following canopy closure. φCO2max, app and φCO2max, abs declined significantly by 15-27% (P<0.05) with canopy depth. Experimentally, leaf age was shown unlikely to cause this loss. Modeling canopy CO2 assimilation over diurnal courses suggested that the observed decline in φCO2max, app with canopy depth costs 10% of potential carbon gain. Overcoming this limitation could substantially increase the productivity of major C4 crops. {\textcopyright} The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.",
keywords = "C4 photosynthesis, Canopy photosynthesis, Corn, Crop photosynthesis, Crop yield, Food security, Maize, Miscanthus, Planting density, Quantum yield, Shade acclimation, biological model, darkness, maize, metabolism, photosynthesis, Darkness, Models, Biological, Photosynthesis, Zea mays",
author = "C.P. Pignon and D. Jaiswal and J.M. McGrath and S.P. Long",
year = "2017",
month = jan,
day = "1",
doi = "10.1093/jxb/erw456",
language = "English",
volume = "68",
pages = "335--345",
journal = "Journal of Experimental Botany",
issn = "0022-0957",
publisher = "OXFORD UNIV PRESS",
number = "2",

}

RIS

TY - JOUR

T1 - Loss of photosynthetic efficiency in the shade. An Achilles heel for the dense modern stands of our most productive C4 crops?

AU - Pignon, C.P.

AU - Jaiswal, D.

AU - McGrath, J.M.

AU - Long, S.P.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The wild progenitors of major C4 crops grew as individuals subjected to little shading. Today they are grown in dense stands where most leaves are shaded. Do they maintain photosynthetic efficiency in these low light conditions produced by modern cultivation? The apparent maximum quantum yield of CO2 assimilation (φ CO2max, app ), a key determinant of light-limited photosynthesis, has not been systematically studied in field stands of C4 crops. φCO2max, app was derived from the initial slope of the response of leaf CO2 uptake (A) to photon flux (Q). Leaf fractional light absorptance (α) was measured to determine the absolute maximum quantum yield of CO2 assimilation on an absorbed light basis (φCO2max, abs ). Light response curves were determined on sun and shade leaves of 49 field plants of Miscanthus × giganteus and Zea mays following canopy closure. φCO2max, app and φCO2max, abs declined significantly by 15-27% (P<0.05) with canopy depth. Experimentally, leaf age was shown unlikely to cause this loss. Modeling canopy CO2 assimilation over diurnal courses suggested that the observed decline in φCO2max, app with canopy depth costs 10% of potential carbon gain. Overcoming this limitation could substantially increase the productivity of major C4 crops. © The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.

AB - The wild progenitors of major C4 crops grew as individuals subjected to little shading. Today they are grown in dense stands where most leaves are shaded. Do they maintain photosynthetic efficiency in these low light conditions produced by modern cultivation? The apparent maximum quantum yield of CO2 assimilation (φ CO2max, app ), a key determinant of light-limited photosynthesis, has not been systematically studied in field stands of C4 crops. φCO2max, app was derived from the initial slope of the response of leaf CO2 uptake (A) to photon flux (Q). Leaf fractional light absorptance (α) was measured to determine the absolute maximum quantum yield of CO2 assimilation on an absorbed light basis (φCO2max, abs ). Light response curves were determined on sun and shade leaves of 49 field plants of Miscanthus × giganteus and Zea mays following canopy closure. φCO2max, app and φCO2max, abs declined significantly by 15-27% (P<0.05) with canopy depth. Experimentally, leaf age was shown unlikely to cause this loss. Modeling canopy CO2 assimilation over diurnal courses suggested that the observed decline in φCO2max, app with canopy depth costs 10% of potential carbon gain. Overcoming this limitation could substantially increase the productivity of major C4 crops. © The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.

KW - C4 photosynthesis

KW - Canopy photosynthesis

KW - Corn

KW - Crop photosynthesis

KW - Crop yield

KW - Food security

KW - Maize

KW - Miscanthus

KW - Planting density

KW - Quantum yield

KW - Shade acclimation

KW - biological model

KW - darkness

KW - maize

KW - metabolism

KW - photosynthesis

KW - Darkness

KW - Models, Biological

KW - Photosynthesis

KW - Zea mays

U2 - 10.1093/jxb/erw456

DO - 10.1093/jxb/erw456

M3 - Journal article

VL - 68

SP - 335

EP - 345

JO - Journal of Experimental Botany

JF - Journal of Experimental Botany

SN - 0022-0957

IS - 2

ER -