Abstract
Increasing soil salinity of irrigated agricultural areas represents a major environmental stress factor that impairs the production of many salt-sensitive crop plants. Different lettuce cultivars were studied for identification of more tolerant ones, based on physiological properties. Five selected lettuce cultivars were grown hydroponically, salt stress was induced by 50 mM and 100 mM of NaCl. The cultivars exhibited differential reduction in shoot fresh weight. The highest sodium and free proline accumulation in the shoot of the most tolerant cultivar, associated with a moderate decrease of the root hydraulic conductance and of the leaf stomatal conductance, can be related to a better defense mechanism against osmotic stress. Salt exposure increased the potassium and calcium ion content of the xylem sap, which may be important for an efficient osmotic adjustment needed to support leaf expansion. The fact that the highest amount of Na+ was found in the shoot of the most tolerant cultivar, and the lowest in the most sensitive one, reflects that in lettuce Na+ exclusion is not a main strategy for salt tolerance. Lettuce is a good example for the case in which salinity tolerance is related not to exclusion, but to inclusion of sodium ions in the shoot system. For salt tolerant varieties the marketable yield has a higher dry biomass percentage, leaves of plants grown under high salinity are crispier, darker green and have a slight salty taste.
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Claims 8
Claim · model-written summary
Lettuce cultivars differed in shoot fresh-weight reduction under salt stress.
- Taxon
- lettuce cultivars
Lactuca sativat0 - Outcome
- shoot fresh weighte0
- Direction
- reductione0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cultivars exhibited differential reduction in shoot fresh weight.”
t0“lettuce cultivars”
Claim · model-written summary
The most tolerant cultivar accumulated the most shoot sodium and free proline.
- Taxon
- lettuce cultivarsLactuca sativat0
- Material
- most tolerant cultivare0
- Organ / stage
- shoote0
- Outcome
- sodium and free proline accumulatione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest sodium and free proline accumulation in the shoot of the most tolerant cultivar, associated with a moderate decrease of the root hydraulic conductance and of the leaf stomatal conductance”
t0“lettuce cultivars”
Claim · model-written summary
Root hydraulic and leaf stomatal conductance moderately decreased in the most tolerant cultivar.
- Taxon
- lettuce cultivarsLactuca sativat0
- Material
- most tolerant cultivare1
- Outcome
- root hydraulic conductance and of the leaf stomatal conductancee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“associated with a moderate decrease of the root hydraulic conductance and of the leaf stomatal conductance”
e1“The highest sodium and free proline accumulation in the shoot of the most tolerant cultivar, associated with a moderate decrease of the root hydraulic conductance and of the leaf stomatal conductance”
t0“lettuce cultivars”
Claim · model-written summary
Salt exposure increased potassium and calcium ion content in xylem sap.
- Taxon
- lettuce cultivarsLactuca sativat0
- Treatment
- Salt exposuree0
- Outcome
- potassium and calcium ion content of the xylem sape0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt exposure increased the potassium and calcium ion content of the xylem sap”
t0“lettuce cultivars”
Claim · model-written summary
Shoot Na+ was highest in the most tolerant cultivar and lowest in the most sensitive cultivar.
- Taxon
- lettuce cultivarsLactuca sativat0
- Organ / stage
- shoote0
- Outcome
- amount of Na+e0
- Direction
- higheste0
- Comparator
- most sensitive onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest amount of Na+ was found in the shoot of the most tolerant cultivar, and the lowest in the most sensitive one”
t0“lettuce cultivars”
Claim · model-written summary
Salinity tolerance in lettuce was related to sodium inclusion in shoots.
- Taxon
- lettuce cultivarsLactuca sativat0
- Outcome
- salinity tolerancee0
- Qualifier
- inclusion of sodium ions in the shoot systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity tolerance is related not to exclusion, but to inclusion of sodium ions in the shoot system”
t0“lettuce cultivars”
Claim · model-written summary
Salt-tolerant varieties had marketable yield with a higher dry biomass percentage.
- Taxon
- lettuce cultivarsLactuca sativat0
- Outcome
- dry biomass percentagee0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For salt tolerant varieties the marketable yield has a higher dry biomass percentage”
t0“lettuce cultivars”
Claim · model-written summary
Leaves grown under high salinity were crispier, darker green and slightly salty.
- Taxon
- lettuce cultivarsLactuca sativat0
- Treatment
- high salinitye0
- Outcome
- crispier, darker green and have a slight salty tastee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of plants grown under high salinity are crispier, darker green and have a slight salty taste”
t0“lettuce cultivars”
The same questions in other papers
salinity · physiology: ion balance · Lactuca sativa (garden lettuce)Positive and negative results
5 in the opposite direction
- negative
- negative
- negative
2 papers more in this group
See all 6 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.