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Leaf age and eCO(2) both influence photosynthesis by increasing light harvesting in mature Eucalyptus tereticornis at EucFACE

Agnieszka Wujeska-Klause, Kristine Crous (UGent) , Oula Ghannoum and David S. Ellsworth
(2019) ENVIRONMENTAL AND EXPERIMENTAL BOTANY. 167.
Author
Organization
Abstract
Only a few previous studies have examined how photosynthetically active radiation absorptance, pigments and electron flow change in mature trees exposed to long-term increase in CO2 concentration. We investigated pigment concentrations, leaf optical properties and quantum yield of old and new leaves exposed to ambient (aCO(2)) and elevated (eCO(2)) CO2 treatments. Leaf absorptance was around 90% in E. tereticornis trees across both foliage age classes and CO2 treatments. New leaves had 15% higher quantum yield with increased absorptance within the blue spectrum than old leaves; while they reflected and transmitted more photons. In addition, young foliage had increased mass-based concentrations of chlorophyll and carotenoids; however, pigment concentrations were reduced when expressed on area-basis. Quantum yield was 9% higher in eCO(2) than aCO(2) across both foliage age classes. The CO2 effect was stronger in new leaves where the quantum yield was 17% higher in eCO(2) than aCO(2), but not different in old leaves between CO2 treatments. New leaves had higher transmittance of photons in eCO(2 )than aCO(2), while there was no change in old leaves. Mass-based concentrations of chlorophyll and carotenoids were reduced in eCO(2) compared to aCO(2) while concentrations of anthocyanins were higher in response to CO2 treatment. There was a significant effect of Age x CO2 interaction on ratio a/b with larger eCO(2) related reductions in old leaves (-5%) but no change in new leaves. Generally, new leaves were more efficient in utilizing the absorbed photons than old leaves, especially under eCO(2) which resulted in more carbon fixation. This implies that leaves can adjust their light harvesting capacity to eCO(2), particularly in younger leaves which have higher photosynthetic activity.
Keywords
CYCLIC ELECTRON FLOW, ELEVATED ATMOSPHERIC CO2, OPTICAL-PROPERTIES, QUANTUM YIELD, PHOTOSYSTEM-I, NONDESTRUCTIVE ESTIMATION, ANTHOCYANIN, CONTENT, PIGMENT CONTENT, REFLECTANCE, LEAVES, Absorptance, Chlorophyll a fluorescence, Leaf age, Quantum yield, Reflectance, Transmittance

Citation

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MLA
Wujeska-Klause, Agnieszka, et al. “Leaf Age and ECO(2) Both Influence Photosynthesis by Increasing Light Harvesting in Mature Eucalyptus Tereticornis at EucFACE.” ENVIRONMENTAL AND EXPERIMENTAL BOTANY, vol. 167, 2019, doi:10.1016/j.envexpbot.2019.103857.
APA
Wujeska-Klause, A., Crous, K., Ghannoum, O., & Ellsworth, D. S. (2019). Leaf age and eCO(2) both influence photosynthesis by increasing light harvesting in mature Eucalyptus tereticornis at EucFACE. ENVIRONMENTAL AND EXPERIMENTAL BOTANY, 167. https://doi.org/10.1016/j.envexpbot.2019.103857
Chicago author-date
Wujeska-Klause, Agnieszka, Kristine Crous, Oula Ghannoum, and David S. Ellsworth. 2019. “Leaf Age and ECO(2) Both Influence Photosynthesis by Increasing Light Harvesting in Mature Eucalyptus Tereticornis at EucFACE.” ENVIRONMENTAL AND EXPERIMENTAL BOTANY 167. https://doi.org/10.1016/j.envexpbot.2019.103857.
Chicago author-date (all authors)
Wujeska-Klause, Agnieszka, Kristine Crous, Oula Ghannoum, and David S. Ellsworth. 2019. “Leaf Age and ECO(2) Both Influence Photosynthesis by Increasing Light Harvesting in Mature Eucalyptus Tereticornis at EucFACE.” ENVIRONMENTAL AND EXPERIMENTAL BOTANY 167. doi:10.1016/j.envexpbot.2019.103857.
Vancouver
1.
Wujeska-Klause A, Crous K, Ghannoum O, Ellsworth DS. Leaf age and eCO(2) both influence photosynthesis by increasing light harvesting in mature Eucalyptus tereticornis at EucFACE. ENVIRONMENTAL AND EXPERIMENTAL BOTANY. 2019;167.
IEEE
[1]
A. Wujeska-Klause, K. Crous, O. Ghannoum, and D. S. Ellsworth, “Leaf age and eCO(2) both influence photosynthesis by increasing light harvesting in mature Eucalyptus tereticornis at EucFACE,” ENVIRONMENTAL AND EXPERIMENTAL BOTANY, vol. 167, 2019.
@article{8763676,
  abstract     = {{Only a few previous studies have examined how photosynthetically active radiation absorptance, pigments and electron flow change in mature trees exposed to long-term increase in CO2 concentration. We investigated pigment concentrations, leaf optical properties and quantum yield of old and new leaves exposed to ambient (aCO(2)) and elevated (eCO(2)) CO2 treatments. Leaf absorptance was around 90% in E. tereticornis trees across both foliage age classes and CO2 treatments. New leaves had 15% higher quantum yield with increased absorptance within the blue spectrum than old leaves; while they reflected and transmitted more photons. In addition, young foliage had increased mass-based concentrations of chlorophyll and carotenoids; however, pigment concentrations were reduced when expressed on area-basis. Quantum yield was 9% higher in eCO(2) than aCO(2) across both foliage age classes. The CO2 effect was stronger in new leaves where the quantum yield was 17% higher in eCO(2) than aCO(2), but not different in old leaves between CO2 treatments. New leaves had higher transmittance of photons in eCO(2 )than aCO(2), while there was no change in old leaves. Mass-based concentrations of chlorophyll and carotenoids were reduced in eCO(2) compared to aCO(2) while concentrations of anthocyanins were higher in response to CO2 treatment. There was a significant effect of Age x CO2 interaction on ratio a/b with larger eCO(2) related reductions in old leaves (-5%) but no change in new leaves. Generally, new leaves were more efficient in utilizing the absorbed photons than old leaves, especially under eCO(2) which resulted in more carbon fixation. This implies that leaves can adjust their light harvesting capacity to eCO(2), particularly in younger leaves which have higher photosynthetic activity.}},
  articleno    = {{103857}},
  author       = {{Wujeska-Klause, Agnieszka and Crous, Kristine and Ghannoum, Oula and Ellsworth, David S.}},
  issn         = {{0098-8472}},
  journal      = {{ENVIRONMENTAL AND EXPERIMENTAL BOTANY}},
  keywords     = {{CYCLIC ELECTRON FLOW,ELEVATED ATMOSPHERIC CO2,OPTICAL-PROPERTIES,QUANTUM YIELD,PHOTOSYSTEM-I,NONDESTRUCTIVE ESTIMATION,ANTHOCYANIN,CONTENT,PIGMENT CONTENT,REFLECTANCE,LEAVES,Absorptance,Chlorophyll a fluorescence,Leaf age,Quantum yield,Reflectance,Transmittance}},
  language     = {{eng}},
  pages        = {{9}},
  title        = {{Leaf age and eCO(2) both influence photosynthesis by increasing light harvesting in mature Eucalyptus tereticornis at EucFACE}},
  url          = {{http://doi.org/10.1016/j.envexpbot.2019.103857}},
  volume       = {{167}},
  year         = {{2019}},
}
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