Abstract
Rice yield is reduced by a short period of water stress at the early panicle-development stage. This study was conducted to examine the factors that reduce the panicle dry weight of rice subjected to water stress and the alleviating effects of top dressing after the stress. Akihikari, Nipponbare and Akebono were grown in 4-L pots under submerged soil conditions. One half of the pots were subjected to the same degree of water stress during panicle development and the other half was grown without water stress. On the day after the stress treatment, chemical fertilizer was applied to one half of each water treatment. Panicle dry weight at maturity was decreased by water stress and the top dressing after the stress alleviated the decrease. The top dressing increased panicle dry weight under the two water treatments in all three cultivars. Increase of panicle dry weight was dependent on that of total dry weight from drainage to full heading, from full heading to maturity, and from drainage to maturity. Leaf area duration (LAD) and net assimilation rate (NAR) were responsible for changes in total dry weight. Effect of water stress was prominent before full heading, while that of top dressing after full heading. It was concluded that reduction of LAD and NAR may be involved in reduction of panicle dry weight by water stress at the early panicle-development stage, and that top dressing after the water stress may mitigate the effect of water stress on panicle dry weight through the improvement of LAD and NAR.
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Claims 9
Claim · model-written summary
Water stress decreased panicle dry weight at maturity in rice compared with plants grown without water stress.
- Taxon
- Rice
Oryza sativat0 - Treatment
- water stresse1
- Outcome
- Panicle dry weight at maturitye1
- Direction
- decreasede1
- Comparator
- grown without water stresse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e1“Panicle dry weight at maturity was decreased by water stress and the top dressing after the stress alleviated the decrease”
e2“One half of the pots were subjected to the same degree of water stress during panicle development and the other half was grown without water stress”
Claim · model-written summary
Top dressing after water stress alleviated the decrease in rice panicle dry weight.
- Taxon
- RiceOryza sativat0
- Treatment
- top dressing after the stresse1
- Outcome
- Panicle dry weight at maturitye1
- Direction
- alleviatede1
- Comparator
- water stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e1“Panicle dry weight at maturity was decreased by water stress and the top dressing after the stress alleviated the decrease”
Claim · model-written summary
Top dressing increased panicle dry weight under both water treatments in all three rice cultivars.
- Taxon
- RiceOryza sativat0
- Material
- Akihikari, Nipponbare and Akebonoe7
- Treatment
- top dressinge2
- Outcome
- panicle dry weighte2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e2“The top dressing increased panicle dry weight under the two water treatments in all three cultivars”
e7“Akihikari, Nipponbare and Akebono were grown in 4-L pots under submerged soil conditions”
Claim · model-written summary
Increase of panicle dry weight depended on increases in total dry weight over the stages from drainage to full heading, full heading to maturity, and drainage to maturity in rice.
- Taxon
- RiceOryza sativat0
- Organ / stage
- from drainage to maturitye3
- Outcome
- total dry weighte3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e3“Increase of panicle dry weight was dependent on that of total dry weight from drainage to full heading, from full heading to maturity, and from drainage to maturity”
Claim · model-written summary
Leaf area duration and net assimilation rate were responsible for changes in total dry weight of rice.
- Taxon
- RiceOryza sativat0
- Outcome
- total dry weighte4
- Qualifier
- Leaf area duration (LAD) and net assimilation rate (NAR)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e4“Leaf area duration (LAD) and net assimilation rate (NAR) were responsible for changes in total dry weight”
Claim · model-written summary
Reduction of leaf area duration and net assimilation rate may be involved in the reduction of panicle dry weight by water stress.
- Taxon
- RiceOryza sativat0
- Treatment
- water stresse6
- Outcome
- panicle dry weighte6
- Qualifier
- reduction of LAD and NARe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e6“It was concluded that reduction of LAD and NAR may be involved in reduction of panicle dry weight by water stress at the early panicle-development stage”
Claim · model-written summary
Top dressing after water stress may mitigate the effect of water stress on panicle dry weight through improved leaf area duration and net assimilation rate.
- Taxon
- RiceOryza sativat0
- Treatment
- top dressing after the water stresse6
- Outcome
- panicle dry weighte6
- Qualifier
- through the improvement of LAD and NARe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e6“and that top dressing after the water stress may mitigate the effect of water stress on panicle dry weight through the improvement of LAD and NAR”
Claim · model-written summary
The effect of water stress on rice was prominent before full heading.
- Taxon
- RiceOryza sativat0
- Outcome
- Effect of water stresse5
- Qualifier
- prominent before full headinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e5“Effect of water stress was prominent before full heading, while that of top dressing after full heading”
Claim · model-written summary
The effect of top dressing on rice was prominent after full heading.
- Taxon
- RiceOryza sativat0
- Treatment
- top dressinge5
- Outcome
- Effecte5
- Qualifier
- after full headinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Top Dressing on Growth and Panicle Dry Weight as Affected by Soil Water Stress at the Early Panicle-Development Stage in Rice (Oryza sativaL.)”
e5“Effect of water stress was prominent before full heading, while that of top dressing after full heading”
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See all 3,455 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.