Abstract
To determine whether variations in high-temperature (HT) tolerance in three rice (Oryza sativa L.) cultivars and two N treatments are related to leaf transpiration rate (E), and whether the involvement of nonstructural carbohydrates (NSC) in HT tolerance is related to E, a pot experiment supplied with two N levels (low N, 0.077g urea kg-1 soil; sufficient N, 0.538g urea kg-1 soil) was conducted under ambient temperature (AT) and HT with three cultivars, N22, Zhenshan 97B and Koshihikari. HT significantly decreased grain yield and seed setting percentage in Koshihikari and ZS97, which could be partly offset by a sufficient N supply. The most HT-tolerant cultivar, N22, had the highest E and stem NSC concentrations under both N treatments, whereas the most sensitive cultivar, Koshihikari, had the lowest E and stem NSC concentrations. A sufficient N supply significantly increased E in the three cultivars under the HT treatment. Grain yield and seed-setting percentage were positively related to E and plant NSC concentration under HT, and E was positively related to NSC concentration under both AT and HT. Therefore, variations in HT tolerance among rice cultivars and nitrogen treatments were related to E, and possibly to NSC concentration.
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Claims 8
Claim · model-written summary
High temperature significantly decreased grain yield and seed setting in Koshihikari and ZS97.
- Taxon
- rice
Oryza sativat0 - Material
- Koshihikari and ZS97e0
- Treatment
- HTe0
- Outcome
- grain yield and seed setting percentagee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HT significantly decreased grain yield and seed setting percentage in Koshihikari and ZS97”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Sufficient nitrogen partly offset the high-temperature losses.
- Taxon
- riceOryza sativae1
- Treatment
- sufficient N supplye0
- Outcome
- grain yield and seed setting percentaget0
- Direction
- offsete0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which could be partly offset by a sufficient N supply.”
t0“HT significantly decreased grain yield and seed setting percentage in Koshihikari and ZS97”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
N22 had the highest leaf transpiration and stem nonstructural carbohydrate concentrations under both nitrogen treatments.
- Taxon
- riceOryza sativat0
- Material
- N22e0
- Outcome
- E and stem NSC concentrationse0
- Direction
- higheste0
- Qualifier
- under both N treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most HT-tolerant cultivar, N22, had the highest E and stem NSC concentrations under both N treatments”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Koshihikari had the lowest leaf transpiration and stem nonstructural carbohydrate concentrations.
- Taxon
- riceOryza sativat0
- Material
- Koshihikarie0
- Outcome
- E and stem NSC concentrationse0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most sensitive cultivar, Koshihikari, had the lowest E and stem NSC concentrations.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Sufficient nitrogen significantly increased leaf transpiration in all three cultivars under high temperature.
- Taxon
- riceOryza sativat0
- Treatment
- sufficient N supplye0
- Outcome
- Ee0
- Direction
- increasede0
- Qualifier
- under the HT treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sufficient N supply significantly increased E in the three cultivars under the HT treatment.”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Grain yield and seed setting were positively related to leaf transpiration under high temperature.
- Taxon
- riceOryza sativat0
- Treatment
- Ee0
- Outcome
- Grain yield and seed-setting percentagee0
- Direction
- positively relatede0
- Qualifier
- under HTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield and seed-setting percentage were positively related to E and plant NSC concentration under HT”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Grain yield and seed setting were positively related to plant nonstructural carbohydrate concentration under high temperature.
- Taxon
- riceOryza sativat0
- Compound
- plant NSC concentratione0
- Outcome
- Grain yield and seed-setting percentagee0
- Direction
- positively relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield and seed-setting percentage were positively related to E and plant NSC concentration under HT”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Leaf transpiration was positively related to nonstructural carbohydrate concentration at ambient and high temperatures.
- Taxon
- riceOryza sativat0
- Compound
- NSC concentratione0
- Outcome
- Ee0
- Direction
- positively relatede0
- Qualifier
- under both AT and HTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“E was positively related to NSC concentration under both AT and HT.”
t0“rice (Oryza sativa L.)”
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