Abstract
SummaryInterest in cultivating purslane (Portulaca oleracea L.) as a food crop has increased since its identification as an excellent source of some biologically-active compounds that are considered to be essential for the promotion of human health and the prevention of disease. The aim of this research was to determine the effects of salinity, by means of exposure to different concentrations of NaCl in the nutrient solution, on the germination, growth, yield, and nitrate contents of purslane cultivated in a hydroponic system under two different light intensities. The results indicated that higher germination percentages (approx. 50%) were obtained between saline levels with electrical conductivities (EC) of 0 – 12.5 dS m–1. Above 12.5 dS m–1, the germination percentage decreased significantly. Salinity reduced both shoot and root growth. This reduction was greater in plants grown under the lower light intensity. When the EC of the nutrient solution increased from 2.5 dS m–1 to 15.0 dS m–1, yields were reduced by 26% in plants grown in a greenhouse, and by 82.2% in plants grown under the lower light intensity in a growth chamber. In both cases, nitrate levels increased in plants grown at an EC of 5.0 dS m–1, but nitrate levels decreased with further increases in salinity. In all cases, nitrate levels were below the maximum levels established by European Regulations for lettuce.
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Claims 9
Claim · model-written summary
Purslane germination reached approximately 50% across EC 0–12.5 dS m–1.
- Taxon
- purslane (Portulaca oleracea L.)
Portulaca oleraceae1 - Outcome
- germination percentagese0
- Direction
- highere0
- Value
- approx. 50%e0
- Qualifier
- 0 – 12.5 dS m–1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher germination percentages (approx. 50%) were obtained between saline levels with electrical conductivities (EC) of 0 – 12.5 dS m–1”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Above EC 12.5 dS m–1, purslane germination decreased significantly.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Treatment
- Above 12.5 dS m–1e0
- Outcome
- germination percentagee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above 12.5 dS m–1, the germination percentage decreased significantly.”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Salinity reduced purslane shoot and root growth.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Treatment
- Salinitye0
- Outcome
- shoot and root growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity reduced both shoot and root growth.”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
The salinity-related growth reduction was greater under lower light intensity.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae2
- Outcome
- shoot and root growthe1
- Direction
- greatere0
- Setting
- lower light intensitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This reduction was greater in plants grown under the lower light intensity.”
e1“Salinity reduced both shoot and root growth.”
e2“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Increasing nutrient solution EC from 2.5 to 15.0 dS m–1 reduced greenhouse purslane yield by 26%.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Treatment
- 15.0 dS m–1e0
- Outcome
- yieldse0
- Direction
- reducede0
- Value
- 26%e0
- Comparator
- 2.5 dS m–1e0
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the EC of the nutrient solution increased from 2.5 dS m–1 to 15.0 dS m–1, yields were reduced by 26% in plants grown in a greenhouse”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Increasing nutrient solution EC from 2.5 to 15.0 dS m–1 reduced purslane yield under lower light in a growth chamber by 82.2%.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Treatment
- 15.0 dS m–1e0
- Outcome
- yieldse0
- Direction
- reducede0
- Value
- 82.2%e0
- Qualifier
- lower light intensitye0
- Comparator
- 2.5 dS m–1e0
- Setting
- growth chambere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the EC of the nutrient solution increased from 2.5 dS m–1 to 15.0 dS m–1, yields were reduced by 26% in plants grown in a greenhouse, and by 82.2% in plants grown under the lower light intensity in a growth chamber.”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Purslane nitrate levels increased at EC 5.0 dS m–1 in both light settings.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Treatment
- EC of 5.0 dS m–1e0
- Outcome
- nitrate levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cases, nitrate levels increased in plants grown at an EC of 5.0 dS m–1”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Purslane nitrate levels decreased with further salinity increases.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Treatment
- further increases in salinitye0
- Outcome
- nitrate levelse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate levels decreased with further increases in salinity”
e1“purslane (Portulaca oleracea L.)”
Claim · model-written summary
Purslane nitrate levels remained below European limits for lettuce.
- Taxon
- purslane (Portulaca oleracea L.)Portulaca oleraceae1
- Outcome
- nitrate levelse0
- Direction
- belowe0
- Comparator
- maximum levels established by European Regulations for lettucee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate levels were below the maximum levels established by European Regulations for lettuce”
e1“purslane (Portulaca oleracea L.)”
The same questions in other papers
salinity · growth · Portulaca oleraceaResults agree
2 papers in the same direction as this paper
- negative
- negative
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.