Abstract
Rice (Oryza sativa L.) is the most important cereal crop and a major staple food for majority of the human populations worldwide. Rice crop is sensitive to salinity. In spite of large number of studies on salinity tolerance of rice, our knowledge on the overall effect of salinity on rice seedling growth is limited. Improvement in salt tolerance of crop plants remains indescribable, largely due to the fact that salinity is a complex trait which affects almost every aspect of the physiology, biochemistry and genomics of plants. The present investigation was conducted to establish the relationship between various morphological, physiological traits and stress indices. A set of 131 rice accessions was evaluated in two levels namely, non-stress (EC ~ 1.2 dS/m) and saline stress (EC ~ 10 dS/m) in hydroponics at seedling stage. Root length and shoot lengths were reduced by 52 and 50%, respectively in saline stress compared to non-stress conditions. There was a significant correlation between various morphological and physiological parameters in non-saline in addition to saline stress as well as non-stress. The effect of the increased Na+ concentration in the medium is detrimental to root length and shoot length as observed by reduction in root length and a concomitant reduction in shoot length. Increased concentration of Na+ led to augmented Na+/K+ ratio with increased stress in the medium and decreased expression of traits. A significant positive correlation (r=0.60) was noticed between stress tolerance index (STI) of root and shoot length. The stress susceptibility index (SSI) for root length was expressed significant positive correlation with SSI for shoot length (r=0.43). SSI for K+ content was registered significant negative correlation with STI for Na+ content (r=-0.43). The three accessions namely, IC 545004, IC 545486 and IC 545215 were found to be the best performers adjudged on the morphological and physiological criteria in saline stress situation. These three rice accessions could be used as a donor parent or for genotypic studies in future breeding programs.
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Claims 14
Claim · model-written summary
Saline stress reduced rice seedling root length by 52% relative to non-stress conditions.
- Taxon
- rice
Oryza sativat0 - Treatment
- saline stresse0
- Outcome
- Root lengthe0
- Direction
- reducede0
- Value
- 52e0
- Comparator
- non-stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length and shoot lengths were reduced by 52 and 50%, respectively in saline stress compared to non-stress conditions.”
t0“rice”
Claim · model-written summary
Saline stress reduced rice seedling shoot length by 50% relative to non-stress conditions.
- Taxon
- riceOryza sativat0
- Treatment
- saline stresse0
- Outcome
- shoot lengthse0
- Direction
- reducede0
- Value
- 50%e0
- Comparator
- non-stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length and shoot lengths were reduced by 52 and 50%, respectively in saline stress compared to non-stress conditions.”
t0“rice”
Claim · model-written summary
Morphological and physiological parameters of rice were significantly correlated under saline and non-stress conditions.
- Taxon
- riceOryza sativat0
- Outcome
- correlation between various morphological and physiological parameterse0
- Setting
- non-salinee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant correlation between various morphological and physiological parameters in non-saline in addition to saline stress as well as non-stress.”
t0“rice”
Claim · model-written summary
Increased medium Na+ concentration was detrimental to rice root length.
- Taxon
- riceOryza sativat0
- Treatment
- increased Na+ concentration in the mediume0
- Outcome
- root lengthe0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of the increased Na+ concentration in the medium is detrimental to root length and shoot length as observed by reduction in root length and a concomitant reduction in shoot length.”
t0“rice”
Claim · model-written summary
Increased medium Na+ concentration was detrimental to rice shoot length.
- Taxon
- riceOryza sativat0
- Treatment
- increased Na+ concentration in the mediume0
- Outcome
- shoot lengthe0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of the increased Na+ concentration in the medium is detrimental to root length and shoot length as observed by reduction in root length and a concomitant reduction in shoot length.”
t0“rice”
Claim · model-written summary
Increasing Na+ concentration augmented the rice Na+/K+ ratio under increasing stress.
- Taxon
- riceOryza sativat0
- Treatment
- Increased concentration of Na+e0
- Outcome
- Na+/K+ ratioe0
- Direction
- augmentede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased concentration of Na+ led to augmented Na+/K+ ratio with increased stress in the medium”
t0“rice”
Claim · model-written summary
Increasing Na+ concentration decreased expression of rice seedling traits.
- Taxon
- riceOryza sativat0
- Treatment
- Increased concentration of Na+e0
- Outcome
- expression of traitse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased concentration of Na+ led to augmented Na+/K+ ratio with increased stress in the medium and decreased expression of traits.”
t0“rice”
Claim · model-written summary
Root-length and shoot-length stress tolerance indices were positively correlated in rice (r=0.60).
- Taxon
- riceOryza sativat0
- Organ / stage
- root and shoote0
- Outcome
- stress tolerance index (STI) of root and shoot lengthe0
- Direction
- positive correlatione0
- Value
- r=0.60e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant positive correlation (r=0.60) was noticed between stress tolerance index (STI) of root and shoot length.”
t0“rice”
Claim · model-written summary
Root-length and shoot-length stress susceptibility indices were positively correlated in rice (r=0.43).
- Taxon
- riceOryza sativat0
- Outcome
- stress susceptibility index (SSI) for root lengthe0
- Direction
- positive correlatione0
- Value
- r=0.43e0
- Comparator
- SSI for shoot lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stress susceptibility index (SSI) for root length was expressed significant positive correlation with SSI for shoot length (r=0.43).”
t0“rice”
Claim · model-written summary
SSI for K+ content was negatively correlated with STI for Na+ content in rice (r=-0.43).
- Taxon
- riceOryza sativat0
- Outcome
- SSI for K+ contente0
- Direction
- negative correlatione0
- Value
- r=-0.43e0
- Comparator
- STI for Na+ contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SSI for K+ content was registered significant negative correlation with STI for Na+ content (r=-0.43).”
t0“rice”
Claim · model-written summary
Rice accession IC 545004 was among the best performers under saline stress.
- Taxon
- riceOryza sativat0
- Material
- IC 545004e0
- Outcome
- best performerse0
- Direction
- beste0
- Qualifier
- saline stress situatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three accessions namely, IC 545004, IC 545486 and IC 545215 were found to be the best performers adjudged on the morphological and physiological criteria in saline stress situation.”
t0“rice”
Claim · model-written summary
Rice accession IC 545486 was among the best performers under saline stress.
- Taxon
- riceOryza sativat0
- Material
- IC 545486e0
- Outcome
- best performerse0
- Direction
- beste0
- Qualifier
- saline stress situatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three accessions namely, IC 545004, IC 545486 and IC 545215 were found to be the best performers adjudged on the morphological and physiological criteria in saline stress situation.”
t0“rice”
Claim · model-written summary
Rice accession IC 545215 was among the best performers under saline stress.
- Taxon
- riceOryza sativat0
- Material
- IC 545215e0
- Outcome
- best performerse0
- Direction
- beste0
- Qualifier
- saline stress situatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three accessions namely, IC 545004, IC 545486 and IC 545215 were found to be the best performers adjudged on the morphological and physiological criteria in saline stress situation.”
t0“rice”
Claim · model-written summary
The authors propose the three best-performing rice accessions as donor parents or material for genotypic studies in breeding.
- Taxon
- riceOryza sativae0
- Outcome
- could be used as a donor parent or for genotypic studies in future breeding programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These three rice accessions could be used as a donor parent or for genotypic studies in future breeding programs.”
The same questions in other papers
salinity · growth · Oryza sativa (rice)Positive and negative results
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See all 296 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.