Abstract
In order to understand the physiological adaptation mechanism and recovery mechanism of plant to drought,the physiological characteristics,including photosynthetic parameters,leaf relative water content,leaf membrane permeability,SOD activity and proline content of pear seedling under drought stress and rewatering conditions were investigated with the varieties ‘Cuiguan’ and ‘Huangguan’ as materials.The results showed that: 1) In the process of drought stress,leaf net photosynthetic rate,stomatal conductance and transpiration rate of the two varieties were decreased.Intercellular CO2 concentration was initially reduced and then increased in ‘Cuiguan’ leaf,while it showed a consistent downward trend in ‘Huangguan’.The four parameters of ‘Huangguan’ were significantly higher than those of ‘Cuiguan’,and the photosynthetic parameters of both varieties were significantly recovered after rewatering,however they could not recover to the normal level.2) Drought stress resulted in a sharp decrease of the relative water content and increase of the membrane permeability and proline content.And the superoxide dismutase activity in the leaves of both varieties was initially increased and decreased afterwards.Although these parameters could more or less recover after rewatering,they could not reach the normal level.This study suggested that the drought stress tolerance of ‘Huangguan’ was better than that of ‘Cuiguan’.
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Claims 11
Claim · model-written summary
Drought decreased leaf net photosynthetic rate, stomatal conductance and transpiration in both varieties.
- Taxon
- Pear Seedling
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communist0 - Treatment
- drought stresse0
- Outcome
- leaf net photosynthetic rate,stomatal conductance and transpiration ratee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
e0“In the process of drought stress,leaf net photosynthetic rate,stomatal conductance and transpiration rate of the two varieties were decreased”
t0“Pear Seedling”
Claim · model-written summary
In Cuiguan, leaf intercellular CO2 first decreased then increased during drought.
- Taxon
- Pear SeedlingPyrus communist0
- Material
- ‘Cuiguan’e0
- Outcome
- Intercellular CO2 concentratione0
- Direction
- initially reduced and then increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercellular CO2 concentration was initially reduced and then increased in ‘Cuiguan’ leaf”
t0“Pear Seedling”
Claim · model-written summary
In Huangguan, leaf intercellular CO2 declined consistently during drought.
- Taxon
- Pear SeedlingPyrus communist0
- Material
- ‘Huangguan’e0
- Outcome
- Intercellular CO2 concentratione1
- Direction
- consistent downward trende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it showed a consistent downward trend in ‘Huangguan’”
e1“Intercellular CO2 concentration”
t0“Pear Seedling”
Claim · model-written summary
The four photosynthetic parameters were significantly higher in Huangguan than Cuiguan.
- Taxon
- Pear SeedlingPyrus communist0
- Material
- ‘Huangguan’e0
- Outcome
- photosynthetic parameterse1
- Direction
- highere0
- Comparator
- ‘Cuiguan’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The four parameters of ‘Huangguan’ were significantly higher than those of ‘Cuiguan’”
e1“the photosynthetic parameters of both varieties were significantly recovered after rewatering”
t0“Pear Seedling”
Claim · model-written summary
After rewatering, photosynthetic parameters significantly recovered in both varieties but stayed below normal.
- Taxon
- Pear SeedlingPyrus communist0
- Treatment
- rewateringe0
- Outcome
- photosynthetic parameterse0
- Direction
- recoverede0
- Qualifier
- could not recover to the normal levele0
- Comparator
- normal levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic parameters of both varieties were significantly recovered after rewatering,however they could not recover to the normal level”
t0“Pear Seedling”
Claim · model-written summary
Drought caused a decrease in relative water content.
- Taxon
- Pear SeedlingPyrus communist0
- Treatment
- Drought stresse0
- Outcome
- relative water contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress resulted in a sharp decrease of the relative water content and increase of the membrane permeability and proline content”
t0“Pear Seedling”
Claim · model-written summary
Drought caused a increase in membrane permeability.
- Taxon
- Pear SeedlingPyrus communist0
- Treatment
- Drought stresse0
- Outcome
- membrane permeabilitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress resulted in a sharp decrease of the relative water content and increase of the membrane permeability and proline content”
t0“Pear Seedling”
Claim · model-written summary
Drought caused a increase in proline content.
- Taxon
- Pear SeedlingPyrus communist0
- Treatment
- Drought stresse0
- Outcome
- proline contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress resulted in a sharp decrease of the relative water content and increase of the membrane permeability and proline content”
t0“Pear Seedling”
Claim · model-written summary
Leaf superoxide dismutase activity first increased and then decreased in both varieties.
- Taxon
- Pear SeedlingPyrus communist0
- Organ / stage
- leavese0
- Gene
- superoxide dismutasee0
- Outcome
- superoxide dismutase activitye0
- Direction
- initially increased and decreased afterwardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the superoxide dismutase activity in the leaves of both varieties was initially increased and decreased afterwards”
t0“Pear Seedling”
Claim · model-written summary
Water content, membrane permeability, proline and SOD activity partly recovered after rewatering without reaching normal levels.
- Taxon
- Pear SeedlingPyrus communist0
- Treatment
- rewateringe0
- Outcome
- these parameterse0
- Direction
- recovere0
- Qualifier
- could not reach the normal levele0
- Comparator
- normal levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although these parameters could more or less recover after rewatering,they could not reach the normal level”
e1“relative water content and increase of the membrane permeability and proline content.And the superoxide dismutase activity”
t0“Pear Seedling”
Claim · model-written summary
Huangguan was judged more drought tolerant than Cuiguan.
- Taxon
- Pear SeedlingPyrus communist0
- Material
- ‘Huangguan’e0
- Outcome
- drought stress tolerancee0
- Direction
- bettere0
- Comparator
- ‘Cuiguan’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress tolerance of ‘Huangguan’ was better than that of ‘Cuiguan’”
t0“Pear Seedling”
The same questions in other papers
drought · physiology: osmolytes · Pyrus communis (pear)Results agree
1 paper in the same direction as this paper
- negative
drought · physiology: photosynthesis · Pyrus communis (pear)Results agree
2 papers in the same direction as this paper
- negative
- negative
drought · physiology: oxidative · Pyrus communis (pear)Results agree
2 papers in the same direction as this paper
- negative
- negative
drought · physiology: water · Pyrus communis (pear)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.