Abstract
The present investigation aimed to examine the effects of seaweed extracts (SWE) on tomato plants under saline conditions (50 mM of NaCl). The current findings have shown that the SWE obtained from Jania rubens (J. rubens) gave better results compared to those prepared from the other two seaweeds; Dictyota dichotoma (D. dichotoma) and Gelidium sesquipedale (G. sesquipedale). Indeed, under salt stress, the application of fresh seaweed at 2% significantly (p ≤ 0.05) increased the plant height (26.28 cm ± 0.95) compared with the non-treated stressed control (17.65 cm ± 1.04). Based on these results the effect of J. rubens on some biological and biochemical parameters of tomato plants was evaluated. In fact, increased contents of chlorophylls, total soluble sugars (TSS), and total free amino acids (TFAA) were observed in seaweed-treated plants compared to the control plants. Moreover, the treatment of stressed plants with SWE revealed a significant (p ≤ 0.05) improvement in antioxidant enzyme activities such as superoxide dismutase (SOD), glutathione peroxidase (GPx), and glutathione S-transferase (GST). The extract also showed an increase in the enzyme activities of glutamate dehydrogenase (GDH) and phosphoenolpyruvate carboxylase (PEPC), which are implicated in the nitrogen and carbon metabolism, respectively. Furthermore, the analysis of the chemical composition of the liquid seaweed extracts (fresh and dried) has shown that they contain bioactive compounds such as polyphenols, flavonoids, soluble sugars, and amino acids, which can be responsible for the tomato's tolerance to salinity. Therefore, the SWE tested in the present study can be used as a biostimulant to enhance the salt stress tolerance of tomato plants.
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Claims 7
Claim · model-written summary
Jania rubens extract performed better than extracts from the other two seaweeds.
- Treatment
- Jania rubense0
- Outcome
- better resultse0
- Direction
- bettere0
- Comparator
- Dictyota dichotoma (D. dichotoma) and Gelidium sesquipedale (G. sesquipedale)e0
Not reportedTaxon
Verbatim
e0“the SWE obtained from Jania rubens (J. rubens) gave better results compared to those prepared from the other two seaweeds; Dictyota dichotoma (D. dichotoma) and Gelidium sesquipedale (G. sesquipedale)”
Claim · model-written summary
Two percent fresh seaweed increased plant height under salt stress versus untreated stressed plants.
- Taxon
- Solanum lycopersicum L
Solanum lycopersicumt0 - Treatment
- application of fresh seaweed at 2%e0
- Outcome
- plant heighte0
- Direction
- increasede0
- Value
- 26.28 cm ± 0.95e0
- Qualifier
- 17.65 cm ± 1.04e0
- Comparator
- non-treated stressed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under salt stress, the application of fresh seaweed at 2% significantly (p ≤ 0.05) increased the plant height (26.28 cm ± 0.95) compared with the non-treated stressed control (17.65 cm ± 1.04)”
t0“Solanum lycopersicum L”
Claim · model-written summary
Seaweed treatment increased chlorophyll, soluble sugar and free amino acid contents in tomato.
- Taxon
- Solanum lycopersicum LSolanum lycopersicumt0
- Treatment
- seaweed-treatede0
- Outcome
- contents of chlorophylls, total soluble sugars (TSS), and total free amino acids (TFAA)e0
- Direction
- increasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased contents of chlorophylls, total soluble sugars (TSS), and total free amino acids (TFAA) were observed in seaweed-treated plants compared to the control plants”
t0“Solanum lycopersicum L”
Claim · model-written summary
Seaweed extract improved antioxidant enzyme activities in stressed tomato.
- Taxon
- Solanum lycopersicum LSolanum lycopersicumt0
- Treatment
- SWEe0
- Outcome
- antioxidant enzyme activities such as superoxide dismutase (SOD), glutathione peroxidase (GPx), and glutathione S-transferase (GST)e0
- Direction
- improvemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment of stressed plants with SWE revealed a significant (p ≤ 0.05) improvement in antioxidant enzyme activities such as superoxide dismutase (SOD), glutathione peroxidase (GPx), and glutathione S-transferase (GST)”
t0“Solanum lycopersicum L”
Claim · model-written summary
The extract increased glutamate dehydrogenase and phosphoenolpyruvate carboxylase activities.
- Taxon
- Solanum lycopersicum LSolanum lycopersicumt0
- Treatment
- The extracte0
- Outcome
- enzyme activities of glutamate dehydrogenase (GDH) and phosphoenolpyruvate carboxylase (PEPC)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extract also showed an increase in the enzyme activities of glutamate dehydrogenase (GDH) and phosphoenolpyruvate carboxylase (PEPC)”
t0“Solanum lycopersicum L”
Claim · model-written summary
Fresh and dried seaweed extracts contained polyphenols, flavonoids, soluble sugars and amino acids.
- Taxon
- Solanum lycopersicum LSolanum lycopersicumt0
- Outcome
- they contain bioactive compounds such as polyphenols, flavonoids, soluble sugars, and amino acidse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“liquid seaweed extracts (fresh and dried) has shown that they contain bioactive compounds such as polyphenols, flavonoids, soluble sugars, and amino acids”
t0“Solanum lycopersicum L”
Claim · model-written summary
The authors propose using seaweed extracts to improve tomato salt tolerance.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- used as a biostimulant to enhance the salt stress tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the SWE tested in the present study can be used as a biostimulant to enhance the salt stress tolerance of tomato plants”
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