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Plant Cell Environ. 2018 Jun;41(6):1427-1437. doi: 10.1111/pce.13180. Epub 2018 Apr 20.

Leaf and canopy photosynthesis of a chlorophyll deficient soybean mutant.

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Institute of Ecology, University of Innsbruck, Sternwartestrasse 15, 6020, Innsbruck, Austria.
Department of Meteorology, Poznan University of Life Sciences, Piatkowska Street 94, 60-649, Poznan, Poland.
Sustainable Agro-Ecosystems and Bioresources Department, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010, San Michele all'Adige, Trento, Italy.
Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Via delle Scienze 206, 33100, Udine, Italy.
Institute of Biometeorology, National Research Council (CNR-IBIMET), Via Caproni 8, 50145, Florence, Italy.
Foxlab Joint CNR-FEM Initiative, Via E. Mach 1, 38010, San Michele all'Adige, Trento, Italy.
Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza 1, 20126, Milan, Italy.
Tree and Timber Institute, National Research Council (CNR-IVALSA), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Florence, Italy.
University of Minnesota, St. Paul, MN, 55108, USA.
Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale (IMBE), Aix Marseille Université, Université Avigon, CNRS 7263/IRD 237, 3 Place Victor Hugo, 13331, Marseille Cedex 03, France.
Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Leo-Brandt-Str, 52425, Jülich, Germany.
IMèRA, Institut D'Etudes Avancés de l'Universitè Aix-Marseille, 2 Place Le Verrier, 13004, Marseille, France.


The photosynthetic, optical, and morphological characteristics of a chlorophyll-deficient (Chl-deficient) "yellow" soybean mutant (MinnGold) were examined in comparison with 2 green varieties (MN0095 and Eiko). Despite the large difference in Chl content, similar leaf photosynthesis rates were maintained in the Chl-deficient mutant by offsetting the reduced absorption of red photons by a small increase in photochemical efficiency and lower non-photochemical quenching. When grown in the field, at full canopy cover, the mutants reflected a significantly larger proportion of incoming shortwave radiation, but the total canopy light absorption was only slightly reduced, most likely due to a deeper penetration of light into the canopy space. As a consequence, canopy-scale gross primary production and ecosystem respiration were comparable between the Chl-deficient mutant and the green variety. However, total biomass production was lower in the mutant, which indicates that processes other than steady state photosynthesis caused a reduction in biomass accumulation over time. Analysis of non-photochemical quenching relaxation and gas exchange in Chl-deficient and green leaves after transitions from high to low light conditions suggested that dynamic photosynthesis might be responsible for the reduced biomass production in the Chl-deficient mutant under field conditions.


NPQ relaxation; steady state and dynamic photosynthesis

[Indexed for MEDLINE]

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