Abstract
Onion is considered as a salt-sensitive plant, however, tolerance to salt seems to be cultivar-dependent and the genotypic responses have not been extensively investigated. In order to evaluate some biochemical responses of six cultivars of onions with different salinity tolerance, a factorial experiment in completely randomized design with two factors include: cultivars (six cultivars of onions) and different levels of salinity (1.2, 3.7, 6.1, 8.5 and 11 dS/m) with three replications carried out in a water culture system. The results showed that the type of physiological response to salinity was cultivar-dependent. In all cultivars, the chlorophyll a, b, total chlorophyll and total carotenoids significantly decreased and proline significantly increased under salt stress. Reductions in photosynthetic pigmentation were observed among all cultivars, but the decrease was higher in sensitive cultivars (Behbahan and Karaj). Susceptible cultivars showed more increase in proline content than tolerant cultivars in stress conditions. The amount of soluble sugars and leaf protein in tolerant cultivars increased, whereas in other cultivars decreased significantly. Total phenol increased in low salinity and decreased with increasing salinity while this reduction in tolerant cultivars (Isfahan and Azarshahr) was less than semi-tolerant (Harsin and P.S) and semi-tolerant was less than susceptible ones. Correlation between stress tolerance index and yield and biochemical indices showed a positive and very significant correlation between salt tolerance index with yield, chlorophyll a, chlorophyll b, total chlorophyll, carotenoids and soluble sugars, and a very significant negative correlation with proline. In general, the results showed that the physiological responses could be used to select more tolerant cultivars. .
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Claims 12
Claim · model-written summary
Salinity responses differed by onion cultivar.
- Taxon
- onion
Allium cepat0 - Treatment
- salinitye0
- Outcome
- physiological responsee0
- Direction
- cultivar-dependente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that the type of physiological response to salinity was cultivar-dependent.”
t0“onion”
Claim · model-written summary
Salt stress significantly decreased onion chlorophyll a, b, total chlorophyll and carotenoids.
- Taxon
- onionAllium cepat0
- Treatment
- salt stresse0
- Outcome
- chlorophyll a, b, total chlorophyll and total carotenoidse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all cultivars, the chlorophyll a, b, total chlorophyll and total carotenoids significantly decreased and proline significantly increased under salt stress.”
t0“onion”
Claim · model-written summary
Salt stress significantly increased onion proline.
- Taxon
- onionAllium cepat0
- Treatment
- salt stresse0
- Outcome
- prolinee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all cultivars, the chlorophyll a, b, total chlorophyll and total carotenoids significantly decreased and proline significantly increased under salt stress.”
t0“onion”
Claim · model-written summary
Sensitive onion cultivars Behbahan and Karaj had greater pigment loss.
- Taxon
- onionAllium cepat0
- Material
- Behbahan and Karaje0
- Outcome
- photosynthetic pigmentatione0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in photosynthetic pigmentation were observed among all cultivars, but the decrease was higher in sensitive cultivars (Behbahan and Karaj).”
t0“onion”
Claim · model-written summary
Susceptible onion cultivars increased proline more than tolerant cultivars under stress.
- Taxon
- onionAllium cepat0
- Material
- Susceptible cultivarse0
- Outcome
- proline contente0
- Direction
- more increasee0
- Comparator
- tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Susceptible cultivars showed more increase in proline content than tolerant cultivars in stress conditions.”
t0“onion”
Claim · model-written summary
Soluble sugars and leaf protein increased in tolerant onion cultivars under salinity.
- Taxon
- onionAllium cepat0
- Material
- tolerant cultivarse0
- Treatment
- salinitye1
- Outcome
- soluble sugars and leaf proteine0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of soluble sugars and leaf protein in tolerant cultivars increased, whereas in other cultivars decreased significantly.”
e1“The results showed that the type of physiological response to salinity was cultivar-dependent.”
t0“onion”
Claim · model-written summary
Soluble sugars and leaf protein decreased significantly in other onion cultivars.
- Taxon
- onionAllium cepat0
- Material
- other cultivarse0
- Treatment
- salinitye1
- Outcome
- soluble sugars and leaf proteine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of soluble sugars and leaf protein in tolerant cultivars increased, whereas in other cultivars decreased significantly.”
e1“The results showed that the type of physiological response to salinity was cultivar-dependent.”
t0“onion”
Claim · model-written summary
Onion total phenol increased at low salinity, then declined as salinity increased.
- Taxon
- onionAllium cepat0
- Treatment
- low salinitye0
- Outcome
- Total phenole0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total phenol increased in low salinity and decreased with increasing salinity while this reduction in tolerant cultivars (Isfahan and Azarshahr) was less than semi-tolerant (Harsin and P.S) and semi-tolerant was less than susceptible ones.”
t0“onion”
Claim · model-written summary
Phenol reduction was less in tolerant Isfahan and Azarshahr onions than in semi-tolerant Harsin and P.S.
- Taxon
- onionAllium cepat0
- Material
- Isfahan and Azarshahre0
- Outcome
- reductione0
- Direction
- lesse0
- Comparator
- Harsin and P.Se0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this reduction in tolerant cultivars (Isfahan and Azarshahr) was less than semi-tolerant (Harsin and P.S) and semi-tolerant was less than susceptible ones.”
t0“onion”
Claim · model-written summary
Salt tolerance index correlated positively and significantly with yield and photosynthetic pigments and soluble sugars.
- Taxon
- onionAllium cepat0
- Outcome
- salt tolerance indexe0
- Direction
- positivee0
- Comparator
- yield, chlorophyll a, chlorophyll b, total chlorophyll, carotenoids and soluble sugarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a positive and very significant correlation between salt tolerance index with yield, chlorophyll a, chlorophyll b, total chlorophyll, carotenoids and soluble sugars”
t0“onion”
Claim · model-written summary
Salt tolerance index correlated negatively and significantly with proline.
- Taxon
- onionAllium cepat0
- Outcome
- prolinee0
- Direction
- negativee0
- Comparator
- prolinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a very significant negative correlation with proline.”
t0“onion”
Claim · model-written summary
The authors conclude that physiological responses can select more tolerant onion cultivars.
- Taxon
- onionAllium cepat0
- Outcome
- select more tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the physiological responses could be used to select more tolerant cultivars.”
t0“onion”
The same questions in other papers
salinity · physiology: osmolytes · Allium cepa (onion)Results agree
1 paper in the same direction as this paper
- positive
salinity · physiology: pigments · Allium cepa (onion)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.