Abstract
Root pressure and plasma membrane intrinsic protein (PIP) availability in the xylem have been recognized to participate in the refilling of embolized conduits, yet integration of the two mechanisms has not been reported in the same plant. In this study, 4-month-old seedlings of a hybrid poplar (Populus alba × Populus glandulosa) clone 84K were subjected to two contrasting soil-water treatments, with the drought treatment involving withholding of water for 17 days to reduce the soil-water content to 10% of the saturated field capacity, followed by a re-watering cycle. The percentage loss of stem hydraulic conductance (PLC) sharply increased, and stomatal conductance and photosynthesis declined in response to drought stress; these processes were gradually restored following the subsequent re-watering. Embolism was most severe in the middle portions of the stem, followed by the basal and top portions of the stems of seedlings subjected to drought stress and subsequent re-watering. Although drought stress eliminated root pressure, re-watering partially restored it in a short period of time. The expression of PIP genes in the xylem was activated by drought stress, and some PIP genes were further stimulated in the top portion after re-watering. The dynamics of root pressure and differential expression of PIP genes along the stem coincided with changes in PLC, suggesting that root pressure and PIPs work together to refill the embolized vessels. On the basis of the recovery dynamics in PLC and g(smax) (maximum stomatal conductance) after re-watering, the stomatal closure and xylem cavitation exhibited fatigue due to drought stress.
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Claims 11
Claim · model-written summary
Drought sharply increased stem hydraulic conductance loss.
- Treatment
- drought stresse0
- Outcome
- percentage loss of stem hydraulic conductance (PLC)e0
- Direction
- increasede0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage loss of stem hydraulic conductance (PLC) sharply increased, and stomatal conductance and photosynthesis declined in response to drought stress”
t0“poplar clone”
Claim · model-written summary
Drought reduced stomatal conductance and photosynthesis.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance and photosynthesis declined in response to drought stress”
t0“poplar clone”
Claim · model-written summary
Rewatering gradually restored hydraulic and gas exchange processes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these processes were gradually restored following the subsequent re-watering”
t0“poplar clone”
Claim · model-written summary
Embolism was most severe in middle stem portions.
- Organ / stage
- middle portions of the steme0
- Outcome
- Embolisme0
- Direction
- most severee0
- Comparator
- basal and top portionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Embolism was most severe in the middle portions of the stem, followed by the basal and top portions”
t0“poplar clone”
Claim · model-written summary
Drought eliminated root pressure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress eliminated root pressure”
t0“poplar clone”
Claim · model-written summary
Rewatering partially restored root pressure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although drought stress eliminated root pressure, re-watering partially restored it in a short period of time”
t0“poplar clone”
Claim · model-written summary
Drought activated xylem PIP gene expression.
- Organ / stage
- xyleme0
- Treatment
- drought stresse0
- Gene
- PIP genese0
- Outcome
- expression of PIP genese0
- Direction
- activatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression of PIP genes in the xylem was activated by drought stress”
t0“poplar clone”
Claim · model-written summary
Rewatering further stimulated some PIP genes in the top stem.
- Organ / stage
- top portione0
- Treatment
- re-wateringe0
- Gene
- PIP genese0
- Outcome
- PIP genese0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some PIP genes were further stimulated in the top portion after re-watering”
t0“poplar clone”
Claim · model-written summary
Root pressure and PIP dynamics coincided with hydraulic conductance loss changes.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dynamics of root pressure and differential expression of PIP genes along the stem coincided with changes in PLC”
t0“poplar clone”
Claim · model-written summary
Authors suggest root pressure and PIPs jointly refill embolized vessels.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that root pressure and PIPs work together to refill the embolized vessels”
t0“poplar clone”
Claim · model-written summary
Stomatal closure and xylem cavitation showed fatigue after drought.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stomatal closure and xylem cavitation exhibited fatigue due to drought stress”
t0“poplar clone”
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See all 10 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.