Abstract
Significant efforts are required to enable rice plant to cope with the menace of high night temperature (HNT) stress. As an immediate solution, use of plant growth hormones can be targeted to maximize plant tolerance against HNT stress. Ascorbic acid (AsA) is a small water soluble molecule which acts as an antioxidant and can directly detoxify active oxygen species. In this study, the potential role of AsA has been investigated for the alleviation of HNT related problems by improving the overall anti-oxidant status and physiological performance of rice. In this regard, the current research was carried out in controlled environment to study the interactive effect of HNT and foliar application of AsA on physiological traits of rice; mainly focusing on its anti-oxidative and nutrient status. Two tested genotypes showed considerable similarity in response to both HNT and AsA. HNT increased the malondialdehyde (MDA) content of both varieties and exogenous AsA reduced it almost to the level of control night temperature (CNT). Similarly, the HNT associated increases in Na + and K + in both root and shoot were also lowered by exogenous AsA. The anti-oxidative enzymes catalase (CAT) and peroxidase (POD) were also increased under HNT. While application of AsA led to reductions in their concentrations. POD was more sensitive to HNT than CAT and AsA also showed more pronounced effect on POD compared to CAT. Although preliminary results for the acclamatory role AsA under HNT are favorable, future detailed studies including diverse genotypes and different levels of AsA applied at various stages are imperative.
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Claims 9
Claim · model-written summary
High night temperature increased malondialdehyde content in both rice varieties.
- Taxon
- rice
Oryza sativat0 - Treatment
- HNTe0
- Outcome
- malondialdehyde (MDA) contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HNT increased the malondialdehyde (MDA) content of both varieties”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
Exogenous AsA reduced malondialdehyde content almost to the level of control night temperature.
- Taxon
- riceOryza sativat0
- Treatment
- exogenous AsAe0
- Outcome
- malondialdehyde (MDA) contente0
- Direction
- reducede0
- Comparator
- control night temperature (CNT)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HNT increased the malondialdehyde (MDA) content of both varieties and exogenous AsA reduced it almost to the level of control night temperature (CNT)”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
High night temperature increased Na+ and K+ in both root and shoot.
- Taxon
- riceOryza sativat0
- Organ / stage
- root and shoote0
- Treatment
- HNTe0
- Outcome
- Na + and K +e0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the HNT associated increases in Na + and K + in both root and shoot were also lowered by exogenous AsA”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
Exogenous AsA lowered the HNT-associated increases in Na+ and K+ in both root and shoot.
- Taxon
- riceOryza sativat0
- Organ / stage
- root and shoote0
- Treatment
- exogenous AsAe0
- Outcome
- Na + and K +e0
- Direction
- lowerede0
- Qualifier
- HNT associated increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the HNT associated increases in Na + and K + in both root and shoot were also lowered by exogenous AsA”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
The anti-oxidative enzymes catalase and peroxidase increased under high night temperature.
- Taxon
- riceOryza sativat0
- Treatment
- HNTe0
- Outcome
- anti-oxidative enzymes catalase (CAT) and peroxidase (POD)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The anti-oxidative enzymes catalase (CAT) and peroxidase (POD) were also increased under HNT”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
Application of AsA reduced the concentrations of the anti-oxidative enzymes catalase and peroxidase.
- Taxon
- riceOryza sativat0
- Treatment
- application of AsAe0
- Outcome
- their concentrationse0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While application of AsA led to reductions in their concentrations”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
Peroxidase was more sensitive to high night temperature than catalase.
- Taxon
- riceOryza sativat0
- Treatment
- HNTe0
- Outcome
- POD was more sensitivee0
- Direction
- more sensitivee0
- Comparator
- CATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“POD was more sensitive to HNT than CAT”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
AsA had a more pronounced effect on peroxidase than on catalase.
- Taxon
- riceOryza sativat0
- Treatment
- AsAe0
- Outcome
- effect on PODe0
- Direction
- more pronouncede0
- Comparator
- CATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AsA also showed more pronounced effect on POD compared to CAT”
t0“Physiological and biochemical changes in rice”
Claim · model-written summary
The two tested rice genotypes responded similarly to both high night temperature and AsA.
- Taxon
- riceOryza sativat0
- Material
- Two tested genotypese0
- Outcome
- similarity in responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two tested genotypes showed considerable similarity in response to both HNT and AsA”
t0“Physiological and biochemical changes in rice”
The same questions in other papers
L-ascorbic acid · physiology: oxidative · Oryza sativa (rice)Positive and negative results
7 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
5 papers more in this group
See all 9 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.