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ČeštinaEnglish

Elevated CO2 concentration affects vertical distribution of photosynthetic activity in Calamagrostis arundinacea (L.) Roth

Result description

An understanding of photosynthetic responses to elevated CO2 concentration (EC) across the entire vertical canopy profile will help to achieve more proper simulation of ecosystem responses to expected climate change. Accordingly, we studied changes in vertical gradients of photosynthetic parameters in the grass species Calamagrostis arundinacea under EC at the time of anthesis. Plants were transplanted and grown for 3 years under ambient (385 ppm, AC) and elevated (700 ppm, EC) atmospheric CO2 concentrations in experimental glass domes. In general, EC reduced the variability of photosynthetic activity within the vertical profile of plants. Such changes also altered the differences between AC and EC in the vertical profile. While EC led to greater accumulation of chlorophylls, CO2 assimilation rate, and efficiency of photochemical processes in lower leaves, EC primarily reduced stomatal conductance and transpiration rate in upper leaves. These changes resulted in higher water-use efficiency in lower leaves. On the other hand, we found slightly greater down-regulation of photosynthesis under EC in lower leaves indicated as the A700/A385 ratio. Such knowledge may be important in upscaling EC effects from leaves to the canopy level and modelling impacts of expected climate change on grassland ecosystems.

Keywords

chlorophyllCO2 assimilationelevated CO2concentrationtranspirationvertical gradientwater-use efficiency

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

    Elevated CO2 concentration affects vertical distribution of photosynthetic activity in Calamagrostis arundinacea (L.) Roth

  • Original language description

    An understanding of photosynthetic responses to elevated CO2 concentration (EC) across the entire vertical canopy profile will help to achieve more proper simulation of ecosystem responses to expected climate change. Accordingly, we studied changes in vertical gradients of photosynthetic parameters in the grass species Calamagrostis arundinacea under EC at the time of anthesis. Plants were transplanted and grown for 3 years under ambient (385 ppm, AC) and elevated (700 ppm, EC) atmospheric CO2 concentrations in experimental glass domes. In general, EC reduced the variability of photosynthetic activity within the vertical profile of plants. Such changes also altered the differences between AC and EC in the vertical profile. While EC led to greater accumulation of chlorophylls, CO2 assimilation rate, and efficiency of photochemical processes in lower leaves, EC primarily reduced stomatal conductance and transpiration rate in upper leaves. These changes resulted in higher water-use efficiency in lower leaves. On the other hand, we found slightly greater down-regulation of photosynthesis under EC in lower leaves indicated as the A700/A385 ratio. Such knowledge may be important in upscaling EC effects from leaves to the canopy level and modelling impacts of expected climate change on grassland ecosystems.

  • Czech name

    —

  • Czech description

    —

Classification

  • Type

    Jost - Miscellaneous article in a specialist periodical

  • CEP classification

    —

  • OECD FORD branch

    10511 - Environmental sciences (social aspects to be 5.7)

Result continuities

Others

  • Publication year

    2017

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Beskydy

  • ISSN

    1803-2451

  • e-ISSN

    —

  • Volume of the periodical

    10

  • Issue of the periodical within the volume

    1-2

  • Country of publishing house

    CZ - CZECH REPUBLIC

  • Number of pages

    7

  • Pages from-to

    67-74

  • UT code for WoS article

    —

  • EID of the result in the Scopus database

    —

Basic information

Result type

Jost - Miscellaneous article in a specialist periodical

Jost

OECD FORD

Environmental sciences (social aspects to be 5.7)

Year of implementation

2017

Similar results(10)

How are plants grown in high CO2 concentrations using a dynamic variable light?Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditionsResponse of photosynthetic apparatus of spring barley (Hordeum vulgare L.) to combined effect of elevated CO2 concentration and different growth irradiances.