Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness.
Steady-state and dynamic gas exchange responses to ozone visible injury were investigated in an ozone-sensitive poplar clone under field conditions. The results were translated into whole tree water loss and carbon assimilation by comparing trees exposed to ambient ozone and trees treated with the o...
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2012-01-01
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doaj-3cc9866075d842c5a319744dbb881b5c2020-11-25T02:32:45ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0176e3927010.1371/journal.pone.0039270Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness.Yasutomo HoshikaKenji OmasaElena PaolettiSteady-state and dynamic gas exchange responses to ozone visible injury were investigated in an ozone-sensitive poplar clone under field conditions. The results were translated into whole tree water loss and carbon assimilation by comparing trees exposed to ambient ozone and trees treated with the ozone-protectant ethylenediurea (EDU). Steady-state stomatal conductance and photosynthesis linearly decreased with increasing ozone visible injury. Dynamic responses simulated by severing of a leaf revealed that stomatal sluggishness increased until a threshold of 5% injury and was then fairly constant. Sluggishness resulted from longer time to respond to the closing signal and slower rate of closing. Changes in photosynthesis were driven by the dynamics of stomata. Whole-tree carbon assimilation and water loss were lower in trees exposed to ambient O(3) than in trees protected by EDU, both under steady-state and dynamic conditions. Although stomatal sluggishness is expected to increase water loss, lower stomatal conductance and premature leaf shedding of injured leaves aggravated O(3) effects on whole tree carbon gain, while compensating for water loss. On average, WUE of trees exposed to ambient ozone was 2-4% lower than that of EDU-protected control trees in September and 6-8% lower in October.http://europepmc.org/articles/PMC3377656?pdf=render |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yasutomo Hoshika Kenji Omasa Elena Paoletti |
spellingShingle |
Yasutomo Hoshika Kenji Omasa Elena Paoletti Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness. PLoS ONE |
author_facet |
Yasutomo Hoshika Kenji Omasa Elena Paoletti |
author_sort |
Yasutomo Hoshika |
title |
Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness. |
title_short |
Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness. |
title_full |
Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness. |
title_fullStr |
Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness. |
title_full_unstemmed |
Whole-tree water use efficiency is decreased by ambient ozone and not affected by O3-induced stomatal sluggishness. |
title_sort |
whole-tree water use efficiency is decreased by ambient ozone and not affected by o3-induced stomatal sluggishness. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2012-01-01 |
description |
Steady-state and dynamic gas exchange responses to ozone visible injury were investigated in an ozone-sensitive poplar clone under field conditions. The results were translated into whole tree water loss and carbon assimilation by comparing trees exposed to ambient ozone and trees treated with the ozone-protectant ethylenediurea (EDU). Steady-state stomatal conductance and photosynthesis linearly decreased with increasing ozone visible injury. Dynamic responses simulated by severing of a leaf revealed that stomatal sluggishness increased until a threshold of 5% injury and was then fairly constant. Sluggishness resulted from longer time to respond to the closing signal and slower rate of closing. Changes in photosynthesis were driven by the dynamics of stomata. Whole-tree carbon assimilation and water loss were lower in trees exposed to ambient O(3) than in trees protected by EDU, both under steady-state and dynamic conditions. Although stomatal sluggishness is expected to increase water loss, lower stomatal conductance and premature leaf shedding of injured leaves aggravated O(3) effects on whole tree carbon gain, while compensating for water loss. On average, WUE of trees exposed to ambient ozone was 2-4% lower than that of EDU-protected control trees in September and 6-8% lower in October. |
url |
http://europepmc.org/articles/PMC3377656?pdf=render |
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