Abstract
Information on plant responses to combined ozone and cadmium stresses are scarce and limited to herbaceous species. In this research, two poplar clones (I-214 and Eridano), differently sensitive to O3, were grown for 5 weeks in pots supplied with 0, 53.5, and 160.5 mg(Cd) kg-1 (soil d.m.) and then exposed to 15-d O3 fumigation (0.06 mm3 dm-3, 5 h a day). The effects of the two stressors, alone or in combination, on Cd, Ca, Fe, and Zn accumulation in above-nad below-ground organs, photosynthesis, leaf pigments, and accumulation of H2O2 and NO were investigated. Cadmium induced a reduction in stomatal conductance and a significant accumulation of H2O2 and NO in both clones nad negatively affected the carotenoid content in I-214. Ozone, on the other hand, counteracted Cd accumulation in the above-ground organs and significantly increased the xanthophyll de-epoxidation state indicating photoinhibition in O3-treated plants. Surprisingly, O3 alone or in combination with Cd decreased H2O2 accumulation in I-214. The NO production was generally stimulated by Cd, whereas it decreased following O3 exposure in I-214. The overall data indicate that Cd and O3 induced clone specific responses. Moreover, when they were applied in combination, antagonistic rather than synergistic effects were observed.
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Claims 10
Claim · model-written summary
Cadmium reduced stomatal conductance in poplar clones.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e1“Cadmium induced a reduction in stomatal conductance and a significant accumulation of H2O2 and NO in both clones”
Claim · model-written summary
Cadmium caused a significant accumulation of H2O2 and NO in poplar clones.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e1“Cadmium induced a reduction in stomatal conductance and a significant accumulation of H2O2 and NO in both clones”
Claim · model-written summary
Cadmium negatively affected carotenoid content in poplar clone I-214.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e1“Cadmium induced a reduction in stomatal conductance and a significant accumulation of H2O2 and NO in both clones”
e2“negatively affected the carotenoid content in I-214”
Claim · model-written summary
Ozone counteracted cadmium accumulation in the above-ground organs of poplar.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e3“Ozone, on the other hand, counteracted Cd accumulation in the above-ground organs”
Claim · model-written summary
Ozone significantly increased the xanthophyll de-epoxidation state in O3-treated poplar, indicating photoinhibition.
- Treatment
- O3-treated plantse4
- Outcome
- xanthophyll de-epoxidation statee4
- Direction
- increasede4
- Qualifier
- indicating photoinhibitione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e4“significantly increased the xanthophyll de-epoxidation state indicating photoinhibition in O3-treated plants”
Claim · model-written summary
Ozone alone or combined with cadmium decreased H2O2 accumulation in poplar clone I-214.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e5“Surprisingly, O3 alone or in combination with Cd decreased H2O2 accumulation in I-214”
Claim · model-written summary
Cadmium generally stimulated NO production in poplar clones.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e6“The NO production was generally stimulated by Cd”
Claim · model-written summary
NO production decreased following ozone exposure in poplar clone I-214.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e6“The NO production was generally stimulated by Cd”
e7“whereas it decreased following O3 exposure in I-214”
Claim · model-written summary
Combined ozone and cadmium produced antagonistic rather than synergistic effects in poplar.
- Outcome
- antagonistic rather than synergistic effectse5
- Qualifier
- when they were applied in combinatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e5“when they were applied in combination, antagonistic rather than synergistic effects were observed”
Claim · model-written summary
Cadmium and ozone induced clone-specific responses in poplar.
- Outcome
- clone specific responsese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar clones”
e6“The overall data indicate that Cd and O3 induced clone specific responses”
The same questions in other papers
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- positive
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- negative
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ozone · molecular: metabolites · Populus (poplar)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
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4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.