Abstract
The rice ( Oryza sativa L.) crop is established under hypoxia when sown into flooded or water‐saturated soft. This study was conducted to clarify the interrelationship between seed vigor and seedling growth in anaerobic soil and to identify seedling characteristics that predict establishment in the field. Different levels of seed vigor were obtained with different cultivars, times of harvest, and accelerated aging treatments. Seeds of cultivars tolerant of anaerobic soil (ASDI, JC178, Taothabi, and Kuhei 2) and of intolerant cultivars (IR36 and IR50) were produced by harvesting 25, 30, 35, and 40 d after heading. Another set of seeds was aged at 43°C and 100% relative humidity for 0, 3, 6, and 9 d. The characteristics measured were germination and germination rate in petri dishes, coleoptile and mesocotyl lengths in N 2 gas in llasks, and seedling establishment, vigor index (which indicates the speed of emergence), height, leaf development, mesocotyl length, and shoot weight in flooded soil in trays and in water‐saturated soil in the field. The harvest time did not affect seedling establishment in the field. Aging reduced seedling establishment significantly in the cultivars tested except ASD1, which was tolerant to aging. Seedling establishment in the field was closely correlated with the vigor index in the field (simple linear correlation coefficient r = 0.8 to 1.0), establishment and vigor index in the tray ( r = 0.5 to 0.9), and coleoptile length in N 2 gas ( r = 0.4 to 0.9), suggesting that these characteristics would be useful in the prediction of seedling establishment in anaerobic soil.
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Claims 6
Claim · model-written summary
Harvest time did not affect seedling establishment in the field.
- Taxon
- rice
Oryza sativae0 - Treatment
- harvest timee1
- Outcome
- seedling establishmente1
- Direction
- did not affecte1
- Setting
- in the fielde1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice ( Oryza sativa L.) crop is established under hypoxia”
e1“The harvest time did not affect seedling establishment in the field”
Claim · model-written summary
Accelerated aging reduced seedling establishment significantly in the cultivars tested, except ASD1, which was tolerant to aging.
- Taxon
- riceOryza sativae0
- Treatment
- Aginge2
- Outcome
- seedling establishmente2
- Direction
- reducede2
- Qualifier
- except ASD1, which was tolerant to aginge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice ( Oryza sativa L.) crop is established under hypoxia”
e2“Aging reduced seedling establishment significantly in the cultivars tested except ASD1, which was tolerant to aging”
Claim · model-written summary
Seedling establishment in the field was closely correlated with the vigor index in the field (r = 0.8 to 1.0).
- Taxon
- riceOryza sativae0
- Outcome
- Seedling establishmente3
- Direction
- higherinferrede3
- Value
- r = 0.8 to 1.0e3
- Qualifier
- simple linear correlation coefficiente3
- Setting
- in the fielde3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice ( Oryza sativa L.) crop is established under hypoxia”
e3“Seedling establishment in the field was closely correlated with the vigor index in the field (simple linear correlation coefficient r = 0.8 to 1.0)”
Claim · model-written summary
Seedling establishment in the tray was correlated with the vigor index in the tray (r = 0.5 to 0.9).
- Taxon
- riceOryza sativae0
- Outcome
- establishmente4
- Direction
- higherinferrede4
- Value
- r = 0.5 to 0.9e4
- Setting
- in the traye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice ( Oryza sativa L.) crop is established under hypoxia”
e4“establishment and vigor index in the tray ( r = 0.5 to 0.9)”
Claim · model-written summary
Coleoptile length in N2 gas was correlated with seedling establishment (r = 0.4 to 0.9).
- Taxon
- riceOryza sativae0
- Outcome
- coleoptile lengthe5
- Direction
- higherinferrede5
- Value
- r = 0.4 to 0.9e5
- Setting
- N 2 gase5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice ( Oryza sativa L.) crop is established under hypoxia”
e5“coleoptile length in N 2 gas ( r = 0.4 to 0.9)”
Claim · model-written summary
The seedling characteristics measured would be useful for predicting seedling establishment in anaerobic soil.
- Taxon
- riceOryza sativae0
- Outcome
- prediction of seedling establishmente6
- Setting
- anaerobic soile6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice ( Oryza sativa L.) crop is established under hypoxia”
e6“suggesting that these characteristics would be useful in the prediction of seedling establishment in anaerobic soil”
The same questions in other papers
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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.