Abstract
<ja:p>Cuttings of Populus kangdingensis C. Wang et Tung and Populus cathayana Rehder, originating from high and low altitudes in the eastern Himalaya, respectively, were examined during one growing season in a greenhouse to determine the effects of progressive drought stress. The results manifested that the adaptive responses to progressive drought stress were different in these two species from different altitudes. Significant changes in stem height, leaf development, relative water content (RWC), malondialdehyde (MDA) and hydrogen peroxide (HO) appeared earlier in P. cathayana than in P. kangdingensis, whereas changes in soluble protein, soluble sugar, free proline and antioxidant enzymes appeared earlier in P. kangdingensis. In addition, changes in these parameters became more and more significant when the drought stress progressed, especially under severe drought stress in P. cathayana. Plant growth showed significant positive correlations with soluble proteins and sugars, free proline and antioxidants and a significant negative correlation with RWC under water stressed treatment in two poplar species. Compared with P. cathayana, P. kangdingensis was able to maintain a superior height growth and leaf development under drought stress. Also, P. kangdingensis possessed greater increments in soluble protein, soluble sugar, free proline and antioxidant enzymes, but lower increments in MDA and HO than did P. cathayana when the cuttings were exposed to progressive drought stress. Our results suggest that P. kangdingensis originating from the high altitude has a better drought tolerance than does P. cathayana originating from the low altitude. Furthermore, this study manifested that acclimation to drought stress are related the rapidity, severity, duration of the drought event and the altitude of two poplar species.<ja:sub>2</ja:sub><ja:sub>2</ja:sub><ja:sub>2</ja:sub><ja:sub>2</ja:sub></ja:p>
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Claims 13
Claim · model-written summary
Changes in stem height and leaf development appeared earlier in P. cathayana than in P. kangdingensis under progressive drought.
- Material
- P. cathayanae1
- Treatment
- progressive drought stresse0
- Outcome
- stem height, leaf developmente1
- Direction
- earliere1
- Comparator
- P. kangdingensise1
- Setting
- greenhousee0
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e1“Significant changes in stem height, leaf development, relative water content (RWC), malondialdehyde (MDA) and hydrogen peroxide (HO) appeared earlier in P. cathayana than in P. kangdingensis”
Claim · model-written summary
Changes in relative water content, malondialdehyde and hydrogen peroxide appeared earlier in P. cathayana than in P. kangdingensis under progressive drought.
- Material
- P. cathayanae1
- Treatment
- progressive drought stresse0
- Outcome
- relative water content (RWC), malondialdehyde (MDA) and hydrogen peroxide (HO)e1
- Direction
- earliere1
- Comparator
- P. kangdingensise1
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e1“Significant changes in stem height, leaf development, relative water content (RWC), malondialdehyde (MDA) and hydrogen peroxide (HO) appeared earlier in P. cathayana than in P. kangdingensis”
Claim · model-written summary
Changes in soluble protein, soluble sugar and free proline appeared earlier in P. kangdingensis under progressive drought.
- Material
- P. kangdingensise2
- Treatment
- progressive drought stresse0
- Outcome
- soluble protein, soluble sugar, free prolinee2
- Direction
- earliere2
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e2“changes in soluble protein, soluble sugar, free proline and antioxidant enzymes appeared earlier in P. kangdingensis”
Claim · model-written summary
Changes in antioxidant enzymes appeared earlier in P. kangdingensis under progressive drought.
- Material
- P. kangdingensise2
- Treatment
- progressive drought stresse0
- Outcome
- antioxidant enzymese2
- Direction
- earliere2
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e2“changes in soluble protein, soluble sugar, free proline and antioxidant enzymes appeared earlier in P. kangdingensis”
Claim · model-written summary
Changes in these parameters became more and more significant as drought stress progressed in the two poplar species.
- Treatment
- drought stress progressede3
- Outcome
- changes in these parameterse3
- Direction
- more and more significante3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e3“changes in these parameters became more and more significant when the drought stress progressed”
Claim · model-written summary
Plant growth was significantly positively correlated with soluble proteins and sugars, free proline and antioxidants under water stress.
- Treatment
- water stressed treatmente4
- Compound
- soluble proteins and sugarse4
- Outcome
- Plant growthe4
- Direction
- positivee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e4“Plant growth showed significant positive correlations with soluble proteins and sugars, free proline and antioxidants and a significant negative correlation with RWC under water stressed treatment”
Claim · model-written summary
Plant growth was significantly negatively correlated with relative water content under water stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e4“Plant growth showed significant positive correlations with soluble proteins and sugars, free proline and antioxidants and a significant negative correlation with RWC under water stressed treatment”
Claim · model-written summary
P. kangdingensis maintained superior height growth and leaf development under drought stress compared with P. cathayana.
- Material
- P. kangdingensise6
- Treatment
- drought stresse6
- Outcome
- height growth and leaf developmente6
- Direction
- superiore6
- Comparator
- P. cathayanae6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e6“Compared with P. cathayana, P. kangdingensis was able to maintain a superior height growth and leaf development under drought stress”
Claim · model-written summary
P. kangdingensis showed greater increments in soluble protein, soluble sugar and free proline than P. cathayana under progressive drought.
- Material
- P. kangdingensise7
- Treatment
- progressive drought stresse7
- Outcome
- soluble protein, soluble sugar, free prolinee7
- Direction
- greater incrementse7
- Comparator
- P. cathayanae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e7“P. kangdingensis possessed greater increments in soluble protein, soluble sugar, free proline and antioxidant enzymes, but lower increments in MDA and HO than did P. cathayana when the cuttings were exposed to progressive drought stress”
Claim · model-written summary
P. kangdingensis showed greater increments in antioxidant enzymes than P. cathayana under progressive drought.
- Material
- P. kangdingensise7
- Treatment
- progressive drought stresse7
- Outcome
- antioxidant enzymese7
- Direction
- greater incrementse7
- Comparator
- P. cathayanae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e7“P. kangdingensis possessed greater increments in soluble protein, soluble sugar, free proline and antioxidant enzymes, but lower increments in MDA and HO than did P. cathayana when the cuttings were exposed to progressive drought stress”
Claim · model-written summary
P. kangdingensis showed lower increments in MDA and HO than P. cathayana under progressive drought.
- Material
- P. kangdingensise7
- Treatment
- progressive drought stresse7
- Outcome
- MDA and HOe7
- Direction
- lower incrementse7
- Comparator
- P. cathayanae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e0“were examined during one growing season in a greenhouse to determine the effects of progressive drought stress”
e7“P. kangdingensis possessed greater increments in soluble protein, soluble sugar, free proline and antioxidant enzymes, but lower increments in MDA and HO than did P. cathayana when the cuttings were exposed to progressive drought stress”
Claim · model-written summary
The authors suggest that P. kangdingensis from high altitude has better drought tolerance than P. cathayana from low altitude.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e1“P. kangdingensis originating from the high altitude has a better drought tolerance than does P. cathayana”
Claim · model-written summary
Acclimation to drought stress is related to the rapidity, severity and duration of the drought event.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in two poplar species originating from different altitudes”
e2“acclimation to drought stress are related the rapidity, severity, duration of the drought event”
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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.