Abstract
In a 2-year study, the morphophysiological and qualitative changes imposed to greenhouse lettuce ( Lactuca sativa L.) by an increasing concentration of NaCl in the irrigation water were determined. Plants were grown under soil conditions and supplied with irrigation water having electrical conductivities (ECs) of 0.7 (control), 0.9, 1.8, 3.6, or 7.2 dS·m −1 . Irrigation with saline water resulted in linear decrease in plant growth parameters (i.e., leaf number, total leaf area and head diameter), head fresh weight, and diameter as well as yield, especially at 1.8, 3.6, and 7.2 dS·m −1 , confirming that lettuce is a salt-sensitive crop. The percentage of marketable yield reduction in comparison with nonsaline control treatment was 22.7%, 36.4%, 45.4%, and 63.6% at 0.9, 1.8, 3.6, and 7.2 dS·m −1 , respectively. The reduction in marketable fresh yield has been partly compensated by a decrease in the nitrate content of salt-treated lettuce. The highest values of hydrophilic antioxidant activity were recorded in the nonsalinized treatment. The lowest values of lipophylic antioxidant activity (LAA) and total ascorbic acid were observed under severe stress conditions (7.2 dS·m −1 ). Net CO 2 assimilation rate and leaf water potential (LWP) declined with increasing NaCl concentration in the irrigation water. Increasing salinity in the irrigation water induced a reduction in stomatal conductance ( g s ) as LWP dropped below −0.62 MPa.
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Claims 11
Claim · model-written summary
Saline irrigation linearly decreased lettuce leaf number, leaf area and head diameter.
- Taxon
- Lettuce
Lactuca sativat0 - Treatment
- Irrigation with saline watere0
- Outcome
- leaf number, total leaf area and head diametere0
- Direction
- linear decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation with saline water resulted in linear decrease in plant growth parameters (i.e., leaf number, total leaf area and head diameter)”
t0“Greenhouse Lettuce”
Claim · model-written summary
Saline irrigation decreased head fresh weight and yield.
- Taxon
- LettuceLactuca sativat0
- Treatment
- Irrigation with saline watere1
- Outcome
- head fresh weight, and diameter as well as yielde0
- Direction
- linear decreasee1
- Qualifier
- especially at 1.8, 3.6, and 7.2 dS·m −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“head fresh weight, and diameter as well as yield, especially at 1.8, 3.6, and 7.2 dS·m −1”
e1“Irrigation with saline water resulted in linear decrease”
t0“Greenhouse Lettuce”
Claim · model-written summary
Marketable yield fell 22.7% at 0.9 dS·m −1.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 0.9e0
- Outcome
- marketable yielde0
- Direction
- reductione0
- Value
- 22.7%e0
- Comparator
- nonsaline control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of marketable yield reduction in comparison with nonsaline control treatment was 22.7%, 36.4%, 45.4%, and 63.6% at 0.9, 1.8, 3.6, and 7.2 dS·m −1 , respectively.”
t0“Greenhouse Lettuce”
Claim · model-written summary
Marketable yield fell 36.4% at 1.8 dS·m −1.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 1.8e0
- Outcome
- marketable yielde0
- Direction
- reductione0
- Value
- 36.4%e0
- Comparator
- nonsaline control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of marketable yield reduction in comparison with nonsaline control treatment was 22.7%, 36.4%, 45.4%, and 63.6% at 0.9, 1.8, 3.6, and 7.2 dS·m −1 , respectively.”
t0“Greenhouse Lettuce”
Claim · model-written summary
Marketable yield fell 45.4% at 3.6 dS·m −1.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 3.6e0
- Outcome
- marketable yielde0
- Direction
- reductione0
- Value
- 45.4%e0
- Comparator
- nonsaline control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of marketable yield reduction in comparison with nonsaline control treatment was 22.7%, 36.4%, 45.4%, and 63.6% at 0.9, 1.8, 3.6, and 7.2 dS·m −1 , respectively.”
t0“Greenhouse Lettuce”
Claim · model-written summary
Marketable yield fell 63.6% at 7.2 dS·m −1.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 7.2e0
- Outcome
- marketable yielde0
- Direction
- reductione0
- Value
- 63.6%e0
- Comparator
- nonsaline control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of marketable yield reduction in comparison with nonsaline control treatment was 22.7%, 36.4%, 45.4%, and 63.6% at 0.9, 1.8, 3.6, and 7.2 dS·m −1 , respectively.”
t0“Greenhouse Lettuce”
Claim · model-written summary
Salt treatment decreased lettuce nitrate content.
- Taxon
- lettuceLactuca sativae0
- Treatment
- salt-treatede0
- Outcome
- nitrate contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in the nitrate content of salt-treated lettuce”
Claim · model-written summary
Hydrophilic antioxidant activity was highest without salinity.
- Taxon
- LettuceLactuca sativat0
- Treatment
- nonsalinized treatmente0
- Outcome
- hydrophilic antioxidant activitye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest values of hydrophilic antioxidant activity were recorded in the nonsalinized treatment.”
t0“Greenhouse Lettuce”
Claim · model-written summary
At 7.2 dS·m −1, lipophylic antioxidant activity and ascorbic acid were lowest.
- Taxon
- LettuceLactuca sativat0
- Treatment
- severe stress conditions (7.2 dS·m −1 )e0
- Outcome
- lipophylic antioxidant activity (LAA) and total ascorbic acide0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest values of lipophylic antioxidant activity (LAA) and total ascorbic acid were observed under severe stress conditions (7.2 dS·m −1 ).”
t0“Greenhouse Lettuce”
Claim · model-written summary
Net CO 2 assimilation and leaf water potential declined as irrigation NaCl increased.
- Taxon
- LettuceLactuca sativat0
- Treatment
- increasing NaCl concentration in the irrigation watere0
- Outcome
- Net CO 2 assimilation rate and leaf water potential (LWP)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net CO 2 assimilation rate and leaf water potential (LWP) declined with increasing NaCl concentration in the irrigation water.”
t0“Greenhouse Lettuce”
Claim · model-written summary
Increasing irrigation salinity reduced stomatal conductance when leaf water potential fell below −0.62 MPa.
- Taxon
- LettuceLactuca sativat0
- Treatment
- Increasing salinity in the irrigation watere0
- Outcome
- stomatal conductance ( g s )e0
- Direction
- reductione0
- Qualifier
- LWP dropped below −0.62 MPae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing salinity in the irrigation water induced a reduction in stomatal conductance ( g s ) as LWP dropped below −0.62 MPa.”
t0“Greenhouse Lettuce”
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