Abstract
Soil salinity leads to serious productivity loss by activating a series of metabolic reactions. The static nature of the plants necessitates the activation of complex metabolic activities including antioxidant pathways, especially the scavenging of reactive oxygen species (ROS). In the present study, three rice cultivars, traditionally grown in the Kaipad rice system were selected to characterise their salt tolerance compared to the salt tolerant variety Vytilla-2. The 21 day old seedlings of the Kaipad rice varieties and Vytilla-2 were subjected to salt stress, ranging from 25 mM to 150 mM NaCl. The leaf samples were collected at an interval of 7, 14 and 21 days of salt stress and evaluated for enzymatic and non-enzymatic antioxidants and ascorbate-glutathione cycle enzymes. The specific activity of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) were correlated with the superoxide (O2 -), malondialdehyde (MDA), glutathione (GSH, total and reduced ) and ascorbate (AsA) content using standard protocols. Results indicated that, the variety Ezhome – 1 alleviates salt stress comparable to Vytilla-2, treated with 150 mM NaCl during the 21st day of salt stress, while cultivars Kuthiru and Kuttoosan showed lesser salt tolerance potential comparable to Vytilla-2. The Na+ accumulation was positively correlated with NaCl concentration and reduction in K+ concentration increased the Na+/K+ ratio in all the varieties. Under salt stress the membrane stability index was least affected suggesting the lesser quantity of ion leakage during salt stress. Comparison of salt stress in these varieties suggests the functional cooperation between the antioxidant, ascorbate- glutathione cycle enzymes and nonenzymatic antioxidants to combat the generation of ROS hence promoting their tolerance.
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Claims 7
Claim · model-written summary
The variety Ezhome-1 alleviated salt stress comparably to Vytilla-2 at 150 mM NaCl on day 21 of salt stress.
- Taxon
- rice
Oryza sativat0 - Material
- Ezhome – 1e1
- Treatment
- 150 mM NaCle1
- Outcome
- salt stresse1
- Direction
- alleviatese1
- Comparator
- Vytilla-2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the variety Ezhome – 1 alleviates salt stress comparable to Vytilla-2, treated with 150 mM NaCl during the 21st day of salt stress”
t0“Kaipad Rice Varieties”
Claim · model-written summary
Kuthiru and Kuttoosan showed lesser salt tolerance potential than the Vytilla-2 reference.
- Taxon
- riceOryza sativat0
- Material
- Kuthiru and Kuttoosane2
- Treatment
- salt stresse3
- Outcome
- salt tolerance potentiale2
- Direction
- lessere2
- Comparator
- Vytilla-2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“while cultivars Kuthiru and Kuttoosan showed lesser salt tolerance potential comparable to Vytilla-2”
e3“were subjected to salt stress, ranging from 25 mM to 150 mM NaCl”
t0“Kaipad Rice Varieties”
Claim · model-written summary
Under salt stress the membrane stability index was least affected in the rice varieties.
- Taxon
- riceOryza sativat0
- Treatment
- salt stresse3
- Outcome
- membrane stability indexe4
- Direction
- least affectede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Under salt stress the membrane stability index was least affected”
e3“were subjected to salt stress, ranging from 25 mM to 150 mM NaCl”
t0“Kaipad Rice Varieties”
Claim · model-written summary
Na+ accumulation was positively correlated with NaCl concentration in the rice varieties.
- Taxon
- riceOryza sativat0
- Treatment
- NaCl concentratione6
- Outcome
- Na+ accumulatione6
- Direction
- positively correlatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The Na+ accumulation was positively correlated with NaCl concentration”
t0“Kaipad Rice Varieties”
Claim · model-written summary
A reduction in K+ concentration increased the Na+/K+ ratio in all the rice varieties.
- Taxon
- riceOryza sativat0
- Material
- all the varietiese7
- Compound
- K+e7
- Outcome
- Na+/K+ ratioe7
- Direction
- increasede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“reduction in K+ concentration increased the Na+/K+ ratio in all the varieties”
t0“Kaipad Rice Varieties”
Claim · model-written summary
Activities of antioxidant enzymes were correlated with superoxide, malondialdehyde, glutathione and ascorbate content in the rice varieties.
- Taxon
- riceOryza sativat0
- Gene
- superoxide dismutase (SOD)e0
- Compound
- ascorbate (AsA)e0
- Outcome
- malondialdehyde (MDA)e0
- Direction
- correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The specific activity of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) were correlated with the superoxide (O2 -), malondialdehyde (MDA), glutathione (GSH, total and reduced ) and ascorbate (AsA) content”
t0“Kaipad Rice Varieties”
Claim · model-written summary
Functional cooperation between antioxidant and ascorbate-glutathione cycle enzymes and nonenzymatic antioxidants is suggested to combat ROS and promote salt tolerance.
- Taxon
- riceOryza sativat0
- Outcome
- tolerancee1
- Qualifier
- functional cooperatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“suggests the functional cooperation between the antioxidant, ascorbate- glutathione cycle enzymes and nonenzymatic antioxidants to combat the generation of ROS hence promoting their tolerance”
t0“Kaipad Rice Varieties”
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See all 17 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.