Abstract
Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury. Chilling resistance was enhanced in parallel with the period of heat‐treatment. The level of APX activity was higher in heated seedlings whereas CAT activity was decreased by heat stress. There was no significant difference in SOD activity between heated and unheated seedlings. The elevated activity of APX was sustained after 7 d of chilling. The cytosolic APX gene expression in response to high and low temperature was analysed with an APXa gene probe. APXa mRNA levels increased within 1 h after seedlings were exposed to 42 °C. Elevated APXa mRNA levels could also be detected after 24 h of heating. The APXa mRNA level in preheated seedlings was still higher than unheated seedlings under cold stress. The promoter of the APXa gene was cloned from rice genomic DNA by TAIL‐PCR, and characterized by DNA sequencing. The promoter had a minimal heat shock factor‐binding motif, 5′‐nGAAnnTTCn‐3′, located in the 81 bp upstream of the TATA box. Heat shock induction of the APXa gene could be a possible cause of reduced chilling injury in rice seedlings.
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Claims 11
Claim · model-written summary
Rice seedlings kept at 42 °C for 24 h did not develop chilling injury at 5 °C.
- Taxon
- Rice (Oryza sativa L.)
Oryza sativae0 - Treatment
- kept at 42 °C for 24 he0
- Outcome
- chilling injurye0
- Direction
- did not develope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
Claim · model-written summary
Chilling resistance was enhanced in parallel with the period of heat treatment in rice.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- period of heate1
- Outcome
- Chilling resistancee1
- Direction
- enhancede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e1“Chilling resistance was enhanced in parallel with the period of heat”
Claim · model-written summary
APX activity was higher in heated rice seedlings than in unheated seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- heated seedlingse2
- Outcome
- level of APX activitye2
- Direction
- highere2
- Comparator
- unheated seedlingse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e2“The level of APX activity was higher in heated seedlings whereas CAT activity was decreased by heat stress”
e3“There was no significant difference in SOD activity between heated and unheated seedlings”
Claim · model-written summary
CAT activity was decreased by heat stress in rice seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- heat stresse2
- Outcome
- CAT activitye2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e2“The level of APX activity was higher in heated seedlings whereas CAT activity was decreased by heat stress”
Claim · model-written summary
SOD activity did not differ significantly between heated and unheated rice seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- heatede3
- Outcome
- SOD activitye3
- Direction
- no significant differencee3
- Comparator
- unheated seedlingse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e3“There was no significant difference in SOD activity between heated and unheated seedlings”
Claim · model-written summary
The elevated APX activity was sustained after 7 d of chilling in rice seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- chillinge4
- Outcome
- elevated activity of APXe4
- Direction
- sustainede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e4“The elevated activity of APX was sustained after 7 d of chilling”
Claim · model-written summary
APXa mRNA levels increased within 1 h after rice seedlings were exposed to 42 °C.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- exposed to 42 °Ce5
- Gene
- APXae5
- Outcome
- APXa mRNA levelse5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e5“APXa mRNA levels increased within 1 h after seedlings were exposed to 42 °C”
Claim · model-written summary
Elevated APXa mRNA levels were detected after 24 h of heating in rice seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- heatinge6
- Gene
- APXae6
- Outcome
- APXa mRNA levelse6
- Direction
- Elevatede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e6“Elevated APXa mRNA levels could also be detected after 24 h of heating”
Claim · model-written summary
The APXa mRNA level remained higher in preheated rice seedlings than in unheated seedlings under cold stress.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- preheated seedlingse7
- Gene
- APXae7
- Outcome
- APXa mRNA levele7
- Direction
- highere7
- Qualifier
- under cold stresse7
- Comparator
- unheated seedlingse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e7“The APXa mRNA level in preheated seedlings was still higher than unheated seedlings under cold stress”
Claim · model-written summary
The APXa promoter has a minimal heat shock factor-binding motif located 81 bp upstream of the TATA box.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Outcome
- heat shock factor‐binding motife2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e2“The promoter had a minimal heat shock factor‐binding motif, 5′‐nGAAnnTTCn‐3′, located in the 81 bp upstream of the TATA box”
Claim · model-written summary
Heat-shock induction of the APXa gene might be a cause of reduced chilling injury in rice seedlings.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae0
- Treatment
- Heat shock inductione2
- Gene
- APXae2
- Outcome
- reduced chilling injurye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) seedlings, when kept at 42 °C for 24 h before being kept at 5 °C for 7 d, did not develop chilling injury”
e2“Heat shock induction of the APXa gene could be a possible cause of reduced chilling injury in rice seedlings”
The same questions in other papers
cold · physiology: antioxidant enzymes · Oryza sativa (rice)Results differ
12 papers in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- negative
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See all 19 papers →heat · molecular: expression · Oryza sativa (rice)Positive and negative results
16 papers in the same direction as this paper · 18 in the opposite direction
- negative
- no effect
- negative
31 papers more in this group
See all 35 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.