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Plant water relations and the effects of elevated CO2: a review and suggestions for future research

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Abstract

Increased ambient carbon dioxide (CO2) has been found to ameliorate water stress in the majority of species studied. The results of many studies indicate that lower evaporative flux density is associated with high CO2-induced stomatal closure. As a result of decreases in evaporative flux density and increases in net photosynthesis, also found to occur in high CO2 environments, plants have often been shown to maintain higher water use efficiencies when grown at high CO2 than when grown in normal, ambient air. Plants grown at high CO2 have also been found to maintain higher total water potentials, to increase biomass production, have larger root-to-shoot ratios, and to be generally more drought resistant (through avoidance mechanisms) than those grown at ambient CO2 levels. High CO2-induced changes in plant structure (i.e., vessel or tracheid anatomy, leaf specific conductivity) may be associated with changes in vulnerability to xylem cavitation or in environmental conditions in which runaway embolism is likely to occur. Further study is needed to resolve these important issues. Methodology and other CO2 effects on plant water relations are discussed.

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Abbreviations

A:

net photosynthesis

Ca :

ambient [CO2]

Ci :

internal [CO2]

E:

evaporative flux density

g1 :

leaf conductance

gs :

stomatal conductance

LSC:

leaf specific conductivity

IRGA:

infrared gas analyzer

LAI:

leaf area index

PAR:

photosynthetically active radiation

Ψ:

total plant water potential

Ψsoil :

soil water potential

Ψs :

solute potential

Ψpt :

turgor pressure potential

Ψpx :

xylem pressure potential

RH:

relative humidity

R : S:

root to shoot ratio

RWC:

relative water content

SLA:

specific leaf area

SLW:

specific leaf weight

SPAC:

soil-plant-atmosphere-continuum

SWC:

soil water content

VPD:

vapor pressure deficit

WUE:

water use efficiency

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  1. Northeastern Forest Experiment Station, U.S. Forest Service, P.O. Box 968, 05402, Burlington, VT, USA

    Melvin T. Tyree & John D. Alexander

  2. Department of Botany, University of Vermont, 05405, Burlington, VT, USA

    Melvin T. Tyree & John D. Alexander

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Tyree, M.T., Alexander, J.D. Plant water relations and the effects of elevated CO2: a review and suggestions for future research. Vegetatio 104, 47–62 (1993). https://doi.org/10.1007/BF00048144

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