Abstract
One of the physiological disease, sudden wiliting of Yushin variety suggested that low sunlight, excessive nitrogen application, and highly reduced soil condions either singly or combined, might be possible causes of the disorder. Some visual symptom of sudden wilting are discoloration of leaves, development of nodal roots above the soil surface, total root rot, and lodging. Those observations led to the hypothesis that suffocation of root tissues was a direct cause of the wilting. The oxygen transport characteristics of Yushin, IR262 and Tongil were examined by two methods. First, Soil-cultured plants of the three varieties were subjected to paraffin treatment to decrease the oxygen supply from the air to root tissues through the soil-water system, liquid paraffin was applied to the water surface in the pots at panicle formation stage. In this experiment, sudden wilting was observed of Yushin and IR262 at about a week after the treatment, but Tongil remained green and healthy. Wilting-resistant variety Tongil had higher oxygen release, whereas the susceptible Yushin and IR262 had lower oxygen release. Second, the number and size of the air spaces in each internode were investigated in the 5th internode from the top, all three varieties have a similar number of air spaces, although the air spaces of Thongil were larger. In the 4th internode, Tongil had plenty air spaces, Yushin and one of the Yushin's parents IR262 had scanty or none. The observations indicated that the ability of Yushin and IR262 for oxygen transport is very limited compared with that of Tongil. The limited oxygen supply due to poor development of air space in internode of rice plants may cause suffocation of root tissues, weaken metabolic activity of the tissues, and induce root rot, subsequently inducing sudden wilting and lodging under unfavorable weather, soil and cultural conditions.
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Claims 9
Claim · model-written summary
After paraffin treatment, Yushin and IR262 wilted about a week later.
- Taxon
- Rice Plant
Oryza sativat0 - Material
- Yushin and IR262e0
- Treatment
- treatmente0
- Outcome
- sudden wiltinge0
- Value
- about a weeke0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sudden wilting was observed of Yushin and IR262 at about a week after the treatment”
t0“Rice Plant”
Claim · model-written summary
Tongil remained green and healthy after paraffin treatment.
- Taxon
- Rice PlantOryza sativat0
- Material
- Tongile0
- Treatment
- treatmente1
- Outcome
- remained green and healthye0
- Comparator
- Yushin and IR262e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but Tongil remained green and healthy.”
e1“sudden wilting was observed of Yushin and IR262 at about a week after the treatment”
t0“Rice Plant”
Claim · model-written summary
Tongil had higher oxygen release than the susceptible varieties.
- Taxon
- Rice PlantOryza sativat0
- Material
- Tongile0
- Outcome
- oxygen releasee0
- Direction
- highere0
- Comparator
- Yushin and IR262e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wilting-resistant variety Tongil had higher oxygen release, whereas the susceptible Yushin and IR262 had lower oxygen release.”
t0“Rice Plant”
Claim · model-written summary
Yushin and IR262 had lower oxygen release than Tongil.
- Taxon
- Rice PlantOryza sativat0
- Material
- Yushin and IR262e0
- Outcome
- oxygen releasee0
- Direction
- lowere0
- Comparator
- Tongile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wilting-resistant variety Tongil had higher oxygen release, whereas the susceptible Yushin and IR262 had lower oxygen release.”
t0“Rice Plant”
Claim · model-written summary
The three varieties had similar numbers of air spaces in the fifth internode.
- Taxon
- Rice PlantOryza sativat0
- Organ / stage
- 5th internodee1
- Outcome
- number of air spacese0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all three varieties have a similar number of air spaces”
e1“in the 5th internode from the top”
t0“Rice Plant”
Claim · model-written summary
Thongil had larger air spaces in the fifth internode.
- Taxon
- Rice PlantOryza sativat0
- Material
- Thongile0
- Organ / stage
- 5th internodee1
- Outcome
- air spacese0
- Direction
- largere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the air spaces of Thongil were larger”
e1“in the 5th internode from the top”
t0“Rice Plant”
Claim · model-written summary
Tongil had plentiful air spaces in the fourth internode.
- Taxon
- Rice PlantOryza sativat0
- Material
- Tongile0
- Organ / stage
- 4th internodee0
- Outcome
- air spacese0
- Direction
- plentye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the 4th internode, Tongil had plenty air spaces”
t0“Rice Plant”
Claim · model-written summary
Yushin and IR262 had scant or absent air spaces in the fourth internode.
- Taxon
- Rice PlantOryza sativat0
- Material
- Yushin and one of the Yushin's parents IR262e0
- Organ / stage
- 4th internodee1
- Outcome
- air spacese1
- Direction
- scanty or nonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yushin and one of the Yushin's parents IR262 had scanty or none.”
e1“In the 4th internode, Tongil had plenty air spaces”
t0“Rice Plant”
Claim · model-written summary
The authors infer limited oxygen transport in Yushin and IR262 relative to Tongil.
- Taxon
- Rice PlantOryza sativat0
- Material
- Yushin and IR262e0
- Outcome
- oxygen transporte0
- Direction
- very limitede0
- Comparator
- Tongile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ability of Yushin and IR262 for oxygen transport is very limited compared with that of Tongil.”
t0“Rice Plant”