Abstract
Enhanced production and accumulation of free and conjugated polyamines as well as increased activities of their biosynthetic enzymes in plants have been associated with heat stress. Perchloric acid‐soluble free, as well as conjugated polyamines, and their metabolic enzymes were studied under 45°C heat stress in callus raised from heat‐tolerant and ‐sensitive rice cultivars. The levels of free and conjugated polyamines, as well as arginine decarboxylase (EC 4.1.1.19) and polyamine oxidase (EC 1.4.34) activities were higher in tolerant than in sensitive callus under non‐stressed conditions. Heat stress caused greater accumulation of free and conjugated polyamines in callus of the heat‐tolerant cultivar N22 than in that of the heat‐sensitive cultivar IR8. In particular, the uncommon polyamines norspermidine and norspermine were detected in cv. N22, which increased appreciably during stress, but they were not detected in callus of cv. IR8. Arginine decarboxylase and polyamine oxidase activities increased to a larger extent in N22 than in IR8 callus during stress, activities that were well correlated with the increased levels of common and uncommon polyamines. Increased levels of transglutaminase activity indicated the high titre of conjugated polyamines.
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Claims 8
Claim · model-written summary
Free and conjugated polyamine levels were higher in tolerant than in sensitive rice callus under non-stressed conditions
- Taxon
- rice
Oryza sativat0 - Organ / stage
- calluse1
- Outcome
- levels of free and conjugated polyaminese1
- Direction
- highere1
- Qualifier
- under non‐stressed conditionse1
- Comparator
- sensitive calluse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e1“The levels of free and conjugated polyamines, as well as arginine decarboxylase (EC 4.1.1.19) and polyamine oxidase (EC 1.4.34) activities were higher in tolerant than in sensitive callus under non‐stressed conditions”
Claim · model-written summary
Arginine decarboxylase and polyamine oxidase activities were higher in tolerant than in sensitive rice callus under non-stressed conditions
- Taxon
- riceOryza sativat0
- Organ / stage
- calluse1
- Gene
- arginine decarboxylase (EC 4.1.1.19)e1
- Outcome
- arginine decarboxylase (EC 4.1.1.19) and polyamine oxidase (EC 1.4.34) activitiese1
- Direction
- highere1
- Qualifier
- under non‐stressed conditionse1
- Comparator
- sensitive calluse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e1“The levels of free and conjugated polyamines, as well as arginine decarboxylase (EC 4.1.1.19) and polyamine oxidase (EC 1.4.34) activities were higher in tolerant than in sensitive callus under non‐stressed conditions”
Claim · model-written summary
Heat stress caused greater accumulation of free and conjugated polyamines in callus of the tolerant cultivar N22 than in the sensitive cultivar IR8
- Taxon
- riceOryza sativat0
- Material
- N22e2
- Organ / stage
- calluse2
- Treatment
- Heat stresse2
- Outcome
- accumulation of free and conjugated polyaminese2
- Direction
- greatere2
- Comparator
- IR8e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e2“Heat stress caused greater accumulation of free and conjugated polyamines in callus of the heat‐tolerant cultivar N22 than in that of the heat‐sensitive cultivar IR8”
Claim · model-written summary
Under heat stress, the uncommon polyamines norspermidine and norspermine were detected in cultivar N22 and increased appreciably
- Taxon
- riceOryza sativat0
- Material
- N22e3
- Treatment
- stresse3
- Compound
- norspermidine and norsperminee3
- Outcome
- uncommon polyaminese3
- Direction
- increased appreciablye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e3“In particular, the uncommon polyamines norspermidine and norspermine were detected in cv. N22, which increased appreciably during stress”
Claim · model-written summary
Norspermidine and norspermine were not detected in callus of cultivar IR8
- Taxon
- riceOryza sativat0
- Material
- IR8e4
- Organ / stage
- calluse4
- Compound
- norspermidine and norsperminee3
- Outcome
- not detectede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e3“In particular, the uncommon polyamines norspermidine and norspermine were detected in cv. N22, which increased appreciably during stress”
e4“but they were not detected in callus of cv. IR8”
Claim · model-written summary
Arginine decarboxylase and polyamine oxidase activities increased to a larger extent in N22 than in IR8 callus during heat stress
- Taxon
- riceOryza sativat0
- Material
- N22e5
- Treatment
- stresse5
- Gene
- Arginine decarboxylasee5
- Outcome
- Arginine decarboxylase and polyamine oxidase activitiese5
- Direction
- increased to a larger extente5
- Comparator
- IR8e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e5“Arginine decarboxylase and polyamine oxidase activities increased to a larger extent in N22 than in IR8 callus during stress, activities that were well correlated with the increased levels of common and uncommon polyamines”
Claim · model-written summary
Arginine decarboxylase and polyamine oxidase activities were well correlated with the increased levels of common and uncommon polyamines
- Taxon
- riceOryza sativat0
- Gene
- Arginine decarboxylase and polyamine oxidasee5
- Outcome
- levels of common and uncommon polyaminese5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e5“Arginine decarboxylase and polyamine oxidase activities increased to a larger extent in N22 than in IR8 callus during stress, activities that were well correlated with the increased levels of common and uncommon polyamines”
Claim · model-written summary
Increased transglutaminase activity indicates a high titre of conjugated polyamines
- Taxon
- riceOryza sativat0
- Gene
- transglutaminasee6
- Outcome
- the high titre of conjugated polyaminese6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Polyamines, both common and uncommon, under heat stress in rice (Oryza sativa) callus”
e6“Increased levels of transglutaminase activity indicated the high titre of conjugated polyamines”
The same questions in other papers
heat · molecular: metabolites · Oryza sativa (rice)Results differ
12 papers in the same direction as this paper · 30 in the opposite direction
- negative
- negative
- negative
39 papers more in this group
See all 43 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.