Abstract
Numerous Tunisian arid and semi-arid regions are subjected to soil salinity. Thus, they are known for halophytes plants cultivation, including date palms. Phoenix dactylifera L., cv. ‘Deglet Nour’, is a valuable Tunisian cultivar subjected to high salinity levels. In this way, our purpose is to evaluate the response of its roots to long period exposition to increasing salt concentrations. We started by studying the effects of 4 g/L, 8 g/L, 12 g/L, and 16 g/L NaCl on the parameters of germination (Growth rate—GR, Seed Mortality Rate—SLM, Germination Mean Time—GMT, and Germination Speed—GS) of date palm seeds for a 2-month period. We found that 4 g/L NaCl did not affect the seeds germination, and, hereinafter, the parameters of germination and the radicle length decreased with the increase of NaCl concentrations and experiment time. Then, we demonstrated a high antioxidative enzymes CAT and SOD production in case of salt stress augmentation. Lastly, a metabolomic approach was carried out by LC-HRMS, followed by an untargeted and targeted analysis using the XCMS online and MZmine tools, respectively. The roots chemical composition was compared using PCA. We identified 25 secondary metabolites, divided into 3 categories. Metabolites known for their role in salt stress alleviation include δ-tocotrienol, metabolites identified in salt stress for the first time, and other unknown metabolites.
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Claims 6
Claim · model-written summary
At 4 g/L NaCl, date palm seed germination was unaffected.
- Taxon
- date palm
Phoenix dactyliferat0 - Treatment
- 4 g/L NaCle0
- Outcome
- seeds germinatione0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“4 g/L NaCl did not affect the seeds germination”
t0“Date Palm”
Claim · model-written summary
At higher NaCl concentrations and longer exposure, date palm germination parameters decreased.
- Taxon
- Date PalmPhoenix dactyliferat0
- Treatment
- NaCl concentrationse0
- Outcome
- parameters of germinatione0
- Direction
- decreasede0
- Qualifier
- experiment timee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the parameters of germination and the radicle length decreased with the increase of NaCl concentrations and experiment time”
t0“Date Palm”
Claim · model-written summary
Date palm radicle length decreased with increasing NaCl concentration and time.
- Taxon
- date palmPhoenix dactyliferat0
- Treatment
- NaCl concentrationse0
- Outcome
- radicle lengthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the radicle length decreased with the increase of NaCl concentrations and experiment time”
t0“Date Palm”
Claim · model-written summary
Salt stress augmentation raised CAT and SOD production in date palm roots.
- Taxon
- date palmPhoenix dactyliferat0
- Treatment
- salt stress augmentatione0
- Outcome
- CAT and SOD productione0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a high antioxidative enzymes CAT and SOD production in case of salt stress augmentation”
t0“Date Palm”
Claim · model-written summary
Twenty-five secondary metabolites in three categories were identified in date palm roots.
- Taxon
- date palmPhoenix dactyliferat0
- Outcome
- secondary metabolitese0
- Value
- 25 secondary metabolitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We identified 25 secondary metabolites, divided into 3 categories”
t0“Date Palm”
Claim · model-written summary
Date palm root metabolites included δ-tocotrienol, compounds newly identified in salt stress, and unknown metabolites.
- Taxon
- date palmPhoenix dactyliferat0
- Outcome
- δ-tocotrienol, metabolites identified in salt stress for the first time, and other unknown metabolitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Metabolites known for their role in salt stress alleviation include δ-tocotrienol, metabolites identified in salt stress for the first time, and other unknown metabolites”
t0“Date Palm”
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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.