Abstract
Climate change will bring the interaction of stresses such as increased temperature and drought under high [CO 2 ] conditions. This is likely to impact on crop growth and productivity. This study aimed to ( i ) determine the response of barley water relations to vegetative and anthesis drought periods under triple interaction conditions, ( ii ) test the possibility to prime barley plants for drought, and ( iii ) analyse the involvement of aquaporins in (i) and (ii). The water status of barley was not affected by drought at the vegetative stage, regardless of the environmental conditions. At the anthesis stage, when the water shortage period was more severe, barley plants growing under combined elevated CO 2 and temperature conditions were able to maintain a better water status compared with plants grown under current conditions. Elevated CO 2 and temperature conditions reduced the stomatal conductance and slowed down the plant water flow through a root-leaf hydraulic conductivity coordination. Leaf HvPIP2;1 and HvTIP1 ; 1 aquaporins seemed to play a key role regulating barley's water flow, while leaf and root HvPIP2;5 provided basic level of water flow. At anthesis drought and under future combined conditions, plants showed a reduced cell dehydration and decrease in leaf relative water content compared with plants grown under current conditions. Exposure to a previous drought did not prime the water status of barley plants to a subsequent drought, but instead worsened the response under future conditions. This was due to an imbalance between the roots versus shoot development. • The water status of barley is not affected by vegetative drought. • However, it is affected by anthesis drought but eased by elevated [CO2] × temperature. • Subsequent drought periods worsen barley water status at elevated [CO2] × temperature. • These events are tuned by isoform-specific changes in gene expression of aquaporins.
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Claims 11
Claim · model-written summary
Vegetative drought did not affect barley water status across environmental conditions.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- drought at the vegetative stagee0
- Outcome
- water statuse0
- Direction
- not affectede0
- Qualifier
- regardless of the environmental conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The water status of barley was not affected by drought at the vegetative stage, regardless of the environmental conditions.”
Claim · model-written summary
At anthesis, elevated CO2 and temperature maintained better water status than current conditions.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- combined elevated CO 2 and temperature conditionse0
- Outcome
- water statuse0
- Direction
- bettere0
- Comparator
- current conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley plants growing under combined elevated CO 2 and temperature conditions were able to maintain a better water status compared with plants grown under current conditions.”
Claim · model-written summary
Elevated CO2 and temperature reduced stomatal conductance.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Elevated CO 2 and temperature conditionse0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 and temperature conditions reduced the stomatal conductance and slowed down the plant water flow through a root-leaf hydraulic conductivity coordination.”
t0“barley”
Claim · model-written summary
Elevated CO2 and temperature slowed plant water flow.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Elevated CO 2 and temperature conditionse0
- Outcome
- plant water flowe0
- Direction
- slowed downe0
- Qualifier
- root-leaf hydraulic conductivity coordinatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 and temperature conditions reduced the stomatal conductance and slowed down the plant water flow through a root-leaf hydraulic conductivity coordination.”
t0“barley”
Claim · model-written summary
Leaf HvPIP2;1 and HvTIP1 ; 1 were interpreted as key regulators of barley water flow.
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- Leafe0
- Gene
- HvPIP2;1 and HvTIP1 ; 1 aquaporinse0
- Outcome
- water flowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf HvPIP2;1 and HvTIP1 ; 1 aquaporins seemed to play a key role regulating barley's water flow”
Claim · model-written summary
Leaf and root HvPIP2;5 was interpreted as providing basic water flow.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leaf and roote0
- Gene
- HvPIP2;5e0
- Outcome
- water flowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf and root HvPIP2;5 provided basic level of water flow.”
t0“barley”
Claim · model-written summary
Under future combined conditions, anthesis drought reduced cell dehydration against current conditions.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- anthesis drought and under future combined conditionse0
- Outcome
- cell dehydratione0
- Direction
- reducede0
- Comparator
- current conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At anthesis drought and under future combined conditions, plants showed a reduced cell dehydration and decrease in leaf relative water content compared with plants grown under current conditions.”
t0“barley”
Claim · model-written summary
Under future combined conditions, anthesis drought decreased leaf relative water content against current conditions.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- anthesis drought and under future combined conditionse0
- Outcome
- leaf relative water contente0
- Direction
- decreasee0
- Comparator
- current conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At anthesis drought and under future combined conditions, plants showed a reduced cell dehydration and decrease in leaf relative water content compared with plants grown under current conditions.”
t0“barley”
Claim · model-written summary
Prior drought did not prime barley water status for a later drought.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- Exposure to a previous droughte0
- Outcome
- water statuse0
- Direction
- did not primee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to a previous drought did not prime the water status of barley plants to a subsequent drought”
Claim · model-written summary
Prior drought worsened the later drought response under future conditions.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- previous droughte0
- Outcome
- responsee0
- Direction
- worsenede0
- Qualifier
- future conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to a previous drought did not prime the water status of barley plants to a subsequent drought, but instead worsened the response under future conditions.”
t0“barley”
Claim · model-written summary
The worsened response was attributed to root-shoot developmental imbalance.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- responsee0
- Qualifier
- imbalance between the roots versus shoot developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but instead worsened the response under future conditions. This was due to an imbalance between the roots versus shoot development.”
t0“barley”
The same questions in other papers
drought · physiology: water · Hordeum vulgare (barley)Results differ
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- negative
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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.