Abstract
Abstract Phosphorus (P) deficiency is a limiting factor for sustainable rice ( Oryza sativa L.) production. However, little is known about how rice varieties that differ in tolerance to low P perform under water‐saving irrigation. In this study, we characterized the responses of two rice varieties, ZD88 that has a weak tolerance to low soil P and YJ2 that has a strong tolerance to low soil P to two irrigation regimes under both optimal P (NP, 46.9 mg/kg Olsen‐P) and low P (LP, 6.8 mg/kg Olsen‐P). The first irrigation regime involved continuous flooding (CF), while the second involved alternate wetting and moderate soil drying (AWD). The study was conducted in plants grown in pot over two years. YJ2 exhibited stronger tolerance to LP than ZD88 under both irrigation regimes. Compared to CF, plants grown with AWD produced higher grain yields and had increased phosphorus translocation efficiencies, as well as higher metabolic phosphorus efficiencies and increased phosphorus harvest index values. The water use efficiencies of the two rice varieties were increased under both NP and LP under AWD conditions. The AWD regime also resulted in higher shoot dry weights and increased photosynthesis rates under LP compared with CF. Moreover, the remobilization of non‐structural carbohydrates from stems to the grain was also increased under the AWD regime, together with higher activities of sucrose‐phosphate synthase, sucrose synthase and peroxidases and increased abscisic acid contents in grains. Root dry weights and root to shoot ratios were also increased under AWD conditions, together with increased root acid phosphatase activities. Taken together, these results demonstrate that the AWD regime benefits rice production under LP environment.
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Claims 14
Claim · model-written summary
YJ2 tolerated low P more strongly than ZD88 under both irrigation regimes.
- Taxon
- rice
Oryza sativae1 - Material
- YJ2e0
- Outcome
- tolerance to LPe0
- Direction
- strongere0
- Qualifier
- under both irrigation regimese0
- Comparator
- ZD88e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“YJ2 exhibited stronger tolerance to LP than ZD88 under both irrigation regimes”
e1“rice varieties, ZD88”
Claim · model-written summary
AWD increased rice grain yield relative to CF.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to CF, plants grown with AWD produced higher grain yields”
t0“rice”
Claim · model-written summary
AWD raised phosphorus translocation efficiency compared with CF.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe0
- Outcome
- phosphorus translocation efficienciese0
- Direction
- increasede0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to CF, plants grown with AWD produced higher grain yields and had increased phosphorus translocation efficiencies”
t0“rice”
Claim · model-written summary
AWD raised metabolic phosphorus efficiency compared with CF.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe0
- Outcome
- metabolic phosphorus efficienciese0
- Direction
- highere0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to CF, plants grown with AWD produced higher grain yields and had increased phosphorus translocation efficiencies, as well as higher metabolic phosphorus efficiencies”
t0“rice”
Claim · model-written summary
AWD increased phosphorus harvest index compared with CF.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe0
- Outcome
- phosphorus harvest index valuese0
- Direction
- increasede0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to CF, plants grown with AWD produced higher grain yields and had increased phosphorus translocation efficiencies, as well as higher metabolic phosphorus efficiencies and increased phosphorus harvest index values”
t0“rice”
Claim · model-written summary
AWD increased water use efficiency of both rice varieties under optimal and low P.
- Taxon
- riceOryza sativae0
- Treatment
- AWDe0
- Outcome
- water use efficienciese0
- Direction
- increasede0
- Qualifier
- under both NP and LPe0
- Comparator
- CFe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The water use efficiencies of the two rice varieties were increased under both NP and LP under AWD conditions”
e1“continuous flooding (CF)”
Claim · model-written summary
AWD increased shoot dry weight under low P compared with CF.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe0
- Outcome
- shoot dry weightse0
- Direction
- highere0
- Qualifier
- under LPe0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The AWD regime also resulted in higher shoot dry weights and increased photosynthesis rates under LP compared with CF”
t0“rice”
Claim · model-written summary
AWD increased photosynthesis under low P compared with CF.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe0
- Outcome
- photosynthesis ratese0
- Direction
- increasede0
- Qualifier
- under LPe0
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The AWD regime also resulted in higher shoot dry weights and increased photosynthesis rates under LP compared with CF”
t0“rice”
Claim · model-written summary
AWD increased nonstructural carbohydrate remobilization from stems to grain.
- Taxon
- riceOryza sativat0
- Treatment
- AWD regimee0
- Outcome
- remobilization of non‐structural carbohydrates from stems to the graine0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“remobilization of non‐structural carbohydrates from stems to the grain was also increased under the AWD regime”
t0“rice”
Claim · model-written summary
AWD raised sucrose-phosphate synthase, sucrose synthase and peroxidase activities.
- Taxon
- riceOryza sativat0
- Treatment
- AWD regimee0
- Outcome
- activities of sucrose‐phosphate synthase, sucrose synthase and peroxidasese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the AWD regime, together with higher activities of sucrose‐phosphate synthase, sucrose synthase and peroxidases”
t0“rice”
Claim · model-written summary
AWD increased abscisic acid content in grains.
- Taxon
- riceOryza sativat0
- Organ / stage
- grainse0
- Treatment
- AWD regimee1
- Outcome
- abscisic acid contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased abscisic acid contents in grains”
e1“under the AWD regime”
t0“rice”
Claim · model-written summary
AWD increased root dry weight and root-to-shoot ratio.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe0
- Outcome
- Root dry weights and root to shoot ratiose0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root dry weights and root to shoot ratios were also increased under AWD conditions”
t0“rice”
Claim · model-written summary
AWD increased root acid phosphatase activity.
- Taxon
- riceOryza sativat0
- Treatment
- AWDe1
- Outcome
- root acid phosphatase activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased root acid phosphatase activities”
e1“Root dry weights and root to shoot ratios were also increased under AWD conditions”
t0“rice”
Claim · model-written summary
The authors conclude AWD benefits rice production under low P.
- Taxon
- riceOryza sativae0
- Outcome
- AWD regime benefits rice production under LP environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the AWD regime benefits rice production under LP environment”
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See all 14 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.