Abstract
Abstract The effects of exposure to 0.5–0.7 ppm SO 2 for about one month on the dry weight growth and net photosynthesis of Polygonum cuspidatum were investigate. Furthermore, the carbon and nitrogen concentrations in each plant organ were measured. The results obtained showed no significant decrease in the total dry weight of SO 2 ‐treated plants in comparison with controls. On the other hand, the leaf area ( LA ) and/or leaf dry weight of SO 2 ‐treated plants were increased, and the root dry weight ( RW ) was decreased, in comparison with controls. The leaf carbon assimilation rate (CAR) in SO 2 ‐treated plants was slightly decreased in spite of a clear decrease in net photosynthesis, and the value of ( SW+RW)/LA (SW stem dry weight) was decreased in comparison with controls, thus minimizing the reduction in CAR. Furthermore, the ratio of total leaf carbon absorption (leaf area x CAR) to total root nitrogen absorption (root dry weight x nitrogen assimilation rate) in SO 2 ‐treated plants was similar to that in controls. From these results, it can be concluded that an increase in leaf area and/or leaf dry weight and a decrease in root dry weight in P. cuspidatum under SO 2 stress may be induced in order to compensate for the decrease in CAR and to maintain the ratio of total leaf carbon absorption to total root nitrogen absorption in the early stage of vegetative growth.
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Claims 8
Claim · model-written summary
SO 2 exposure did not significantly decrease total dry weight relative to controls.
- Taxon
- Polygonum cuspidatum
Polygonum cuspidatumt0 - Treatment
- SO 2 ‐treatede0
- Outcome
- total dry weighte0
- Direction
- no significant decreasee0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant decrease in the total dry weight of SO 2 ‐treated plants in comparison with controls”
t0“Polygonum cuspidatum”
Claim · model-written summary
SO 2 exposure increased leaf area and/or leaf dry weight relative to controls.
- Taxon
- Polygonum cuspidatumPolygonum cuspidatumt0
- Treatment
- SO 2 ‐treatede0
- Outcome
- leaf area ( LA ) and/or leaf dry weighte0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf area ( LA ) and/or leaf dry weight of SO 2 ‐treated plants were increased, and the root dry weight ( RW ) was decreased, in comparison with controls”
t0“Polygonum cuspidatum”
Claim · model-written summary
SO 2 exposure decreased root dry weight relative to controls.
- Taxon
- Polygonum cuspidatumPolygonum cuspidatumt0
- Treatment
- SO 2 ‐treatede0
- Outcome
- root dry weight ( RW )e0
- Direction
- decreasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf area ( LA ) and/or leaf dry weight of SO 2 ‐treated plants were increased, and the root dry weight ( RW ) was decreased, in comparison with controls”
t0“Polygonum cuspidatum”
Claim · model-written summary
SO 2 exposure slightly decreased leaf carbon assimilation rate.
- Taxon
- Polygonum cuspidatumPolygonum cuspidatumt0
- Treatment
- SO 2 ‐treatede0
- Outcome
- leaf carbon assimilation rate (CAR)e0
- Direction
- slightly decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf carbon assimilation rate (CAR) in SO 2 ‐treated plants was slightly decreased in spite of a clear decrease in net photosynthesis”
t0“Polygonum cuspidatum”
Claim · model-written summary
SO 2 exposure clearly decreased net photosynthesis.
- Taxon
- Polygonum cuspidatumPolygonum cuspidatumt0
- Treatment
- SO 2 ‐treatede1
- Outcome
- net photosynthesise0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in spite of a clear decrease in net photosynthesis”
t0“Polygonum cuspidatum”
e1“The leaf carbon assimilation rate (CAR) in SO 2 ‐treated plants”
Claim · model-written summary
SO 2 exposure decreased the stem-plus-root dry weight to leaf area ratio relative to controls.
- Taxon
- Polygonum cuspidatumPolygonum cuspidatumt0
- Treatment
- SO 2 ‐treatede1
- Outcome
- ( SW+RW)/LAe0
- Direction
- decreasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the value of ( SW+RW)/LA (SW stem dry weight) was decreased in comparison with controls”
e1“The leaf carbon assimilation rate (CAR) in SO 2 ‐treated plants”
t0“Polygonum cuspidatum”
Claim · model-written summary
The total leaf carbon absorption to total root nitrogen absorption ratio was similar in SO 2 exposed plants and controls.
- Taxon
- Polygonum cuspidatumPolygonum cuspidatumt0
- Treatment
- SO 2 ‐treatede0
- Outcome
- ratio of total leaf carbon absorption (leaf area x CAR) to total root nitrogen absorption (root dry weight x nitrogen assimilation rate)e0
- Direction
- similare0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of total leaf carbon absorption (leaf area x CAR) to total root nitrogen absorption (root dry weight x nitrogen assimilation rate) in SO 2 ‐treated plants was similar to that in controls”
t0“Polygonum cuspidatum”
Claim · model-written summary
The authors infer that changes in leaf and root growth under SO 2 may compensate for reduced carbon assimilation and maintain the carbon-to-nitrogen absorption ratio.
- Taxon
- P. cuspidatumPolygonum cuspidatume0
- Treatment
- SO 2 stresse0
- Outcome
- ratio of total leaf carbon absorption to total root nitrogen absorptione0
- Qualifier
- early stage of vegetative growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in leaf area and/or leaf dry weight and a decrease in root dry weight in P. cuspidatum under SO 2 stress may be induced in order to compensate for the decrease in CAR and to maintain the ratio of total leaf carbon absorption to total root nitrogen absorption in the early stage of vegetative growth”