Development of Water Stress under Increased Atmospheric CO2 Concentration |
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Authors: | J Pospí?ilová J ?atský |
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Institution: | (1) Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Na Karlovce 1a, CZ-160 00 Praha 6, Czech Republic |
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Abstract: | The increase in water use efficiency (the ratio of photosynthetic to transpiration rates) is likely to be the commonest positive
effect of long-term elevation in CO2 concentration (CE). This may not necessarily lead to decrease in long-term water use owing to increased leaf area. However,
some plant species seem to cope better with drought stress under CE, because increased production of photosynthates might
enhance osmotic adjustment and decreased stomatal conductance and transpiration rate under CE enable plants to maintain a
higher leaf water potential during drought. In addition, at the same stomatal conductance, internal CO2 concentration might be higher under CE which results in higher photosynthetic rate. Therefore plants under CE of the future
atmosphere will probably survive eventual higher drought stress and some species may even be able to extend their biotope
into less favourable sites.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | global climate change net photosynthetic rate stomatal conductance transpiration rate water potential water transport water use efficiency |
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