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Water relations and gas exchange in poplar and willow under water stress and elevated atmospheric CO~2~ by Jon D. Johnson; Roberto Tognetti; Piero Paris is a Agricultural and Biological Sciences article available to read on EtoBox.

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Predictions of shifts in rainfall patterns as atmospheric [CO~2~] increases could impact the growth of fast growing trees such as __Populus__ spp. and __Salix__ spp. and the interaction between elevated CO~2~ and water stress in these species is unknown. The objectives of this study were to characterize the responses to elevated CO~2~ and water stress in these two species, and to determine if elevated CO~2~ mitigated drought stress effects. Gas exchange, water potential components, whole plant transpiration and growth response to soil drying and recovery were assessed in hybrid poplar (clone 53–246) and willow (__Salix sagitta__) rooted cuttings growing in either ambient (350 μmol mol^−1^) or elevated (700 μmol mol^−1^) atmospheric CO~2~ concentration ([CO~2~]). Predawn water potential decreased with increasing water stress while midday water potentials remained unchanged (isohydric response). Turgor potentials at both predawn and midday increased in elevated [CO~2~], indicative of osmotic adjustment. Gas exchange was reduced by water stress while elevated [CO~2~] increased photosynthetic rates, reduced leaf conductance and nearly doubled instantaneous transpiration efficiency in b

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Author

Jon D. Johnson; Roberto Tognetti; Piero Paris

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)