Abstract
Previous studies demonstrated that ammonium nutrition results in higher water uptake rate than does nitrate nutrition under water stress, and thus enhances the tolerance of rice plants to water stress. However, the process by which water uptake is related to nitrogen form under water stress remains unknown. A hydroponic experiment with simulated water stress induced by polyethylene glycol (PEG6000) was conducted in a greenhouse to study the relationship between root aerenchyma formation and water uptake rate, such as xylem sap flow rate and hydraulic conductance, in two different rice cultivars (cv. 'Shanyou 63' hybrid indica and cv. 'Yangdao 6' indica, China). The results showed that root aerenchyma tissue increased in water-stressed plants of both cultivars fed by nitrate. No significant difference was found in root hydraulic conductivity and/or xylem sap flow rate between the two rice cultivars fed by ammonium regardless of water status, whereas these parameters decreased significantly in water-stressed plants fed by nitrate. It was concluded that aerenchyma that formed in the root cortex impeded the radial transport of water in the root cylinder and decreased water uptake in water-stressed rice plants fed by nitrate. Water transport occurred mainly through Hg-sensitive water channels in rice roots supplied with ammonium.
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Claims 7
Claim · model-written summary
Water stressed nitrate fed rice formed more root aerenchyma in both cultivars.
- Taxon
- rice
Oryza sativat0 - Treatment
- water-stressed plants of both cultivars fed by nitratee0
- Outcome
- root aerenchyma tissuee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root aerenchyma tissue increased in water-stressed plants of both cultivars fed by nitrate.”
t0“Rice”
Claim · model-written summary
Ammonium fed cultivars had no significant difference in root hydraulic conductivity.
- Taxon
- riceOryza sativae0
- Treatment
- fed by ammoniume0
- Outcome
- root hydraulic conductivitye0
- Direction
- No significant differencee0
- Comparator
- two rice cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant difference was found in root hydraulic conductivity and/or xylem sap flow rate between the two rice cultivars fed by ammonium regardless of water status”
Claim · model-written summary
Ammonium fed cultivars had no significant difference in xylem sap flow.
- Taxon
- riceOryza sativae0
- Treatment
- fed by ammoniume0
- Outcome
- xylem sap flow ratee0
- Direction
- No significant differencee0
- Comparator
- two rice cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant difference was found in root hydraulic conductivity and/or xylem sap flow rate between the two rice cultivars fed by ammonium regardless of water status”
Claim · model-written summary
Water stress significantly decreased root hydraulic conductivity under nitrate.
- Taxon
- riceOryza sativae1
- Treatment
- water-stressed plants fed by nitratee0
- Outcome
- root hydraulic conductivitye1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these parameters decreased significantly in water-stressed plants fed by nitrate.”
e1“root hydraulic conductivity and/or xylem sap flow rate between the two rice cultivars”
Claim · model-written summary
Water stress significantly decreased xylem sap flow under nitrate.
- Taxon
- riceOryza sativae1
- Treatment
- water-stressed plants fed by nitratee0
- Outcome
- xylem sap flow ratee1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these parameters decreased significantly in water-stressed plants fed by nitrate.”
e1“xylem sap flow rate between the two rice cultivars”
Claim · model-written summary
Authors conclude root cortex aerenchyma impeded radial water transport and reduced uptake in stressed nitrate fed rice.
- Taxon
- riceOryza sativae0
- Organ / stage
- root cortexe0
- Outcome
- water uptakee0
- Direction
- decreasede0
- Qualifier
- impeded the radial transport of watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aerenchyma that formed in the root cortex impeded the radial transport of water in the root cylinder and decreased water uptake in water-stressed rice plants fed by nitrate.”
Claim · model-written summary
Water transport in ammonium supplied rice roots occurred mainly through Hg sensitive channels.
- Taxon
- riceOryza sativae0
- Organ / stage
- rootse0
- Outcome
- Water transporte0
- Qualifier
- Hg-sensitive water channelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water transport occurred mainly through Hg-sensitive water channels in rice roots supplied with ammonium.”
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See all 12 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.