Abstract
This study investigated the ameliorating effect of exogenous proline on some physiological responses of salt acclimated and non-acclimated Aloe vera plants against subsequent salt stress (EC 21 dS/m). Compared to control, salinity decreased leaf growth and relative water content (RWC), leaf contents of chlorophyll a, carotenoids, K/Na ratio, photosystem performance index (PIabs), while promoted leaf contents of hydrogen peroxide (H2O2), maloendialdehyde (MDA) and Na, which subsequently induced oxidative stress. However, foliar applied proline was effective in alleviating the deleterious effects of salinity. Maximum amelioration of salt stress by exogenous proline was found only in salt-acclimated plants, which was attributed to the reduced leaf Na accumulation together with enhanced K content. Proline pretreatment improved plant relative water content, which was correlated with enhancement in leaf proline concentration. We showed that application of proline on salt-acclimated stressed plants alleviated the damage to PSII functioning induced by salinity, contributing to the improvement of the oxygen-evolving complex efficiency of PSII (Fv/Fo) and the quantum yield of electron transport (ΦEo). This improvement of PSII activity was achieved by higher carotenoids and phenolic accumulation. Additionally, proline treatment reduced the accumulation of H2O2 and MDA, indicating that proline pretreatment was more effective in lowering oxidative damage in salt-exposed acclimated plants, which was associated with the activation of SOD, CAT and APX enzymes. Thus, proline pretreatment could protect salt acclimated Alo vera plants against subsequent salt stress through improving K/Na ratio and water relations attributes as well as enhancing antioxidant systems, resulting in better photosynthesis under salt stress.
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Claims 14
Claim · model-written summary
Salinity decreased leaf growth and relative water content in Aloe vera compared with control.
- Treatment
- salinitye0
- Outcome
- leaf growth and relative water content (RWC)e0
- Direction
- decreasede0
- Comparator
- controle0
Aloe veraOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to control, salinity decreased leaf growth and relative water content (RWC)”
t0“Aloe vera”
Claim · model-written summary
Salinity decreased leaf chlorophyll a and carotenoid contents in Aloe vera compared with control.
- Treatment
- salinitye0
- Outcome
- leaf contents of chlorophyll a, carotenoidse0
- Direction
- decreasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to control, salinity decreased leaf growth and relative water content (RWC), leaf contents of chlorophyll a, carotenoids”
t0“Aloe vera”
Claim · model-written summary
Salinity decreased the leaf K/Na ratio and photosystem performance index (PIabs) in Aloe vera compared with control.
- Treatment
- salinitye0
- Outcome
- K/Na ratio, photosystem performance index (PIabs)e0
- Direction
- decreasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to control, salinity decreased leaf growth and relative water content (RWC), leaf contents of chlorophyll a, carotenoids, K/Na ratio, photosystem performance index (PIabs)”
t0“Aloe vera”
Claim · model-written summary
Salinity increased leaf hydrogen peroxide, malondialdehyde and Na contents in Aloe vera compared with control, inducing oxidative stress.
- Treatment
- salinitye0
- Outcome
- leaf contents of hydrogen peroxide (H2O2), maloendialdehyde (MDA) and Nae0
- Direction
- promotede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to control, salinity decreased leaf growth and relative water content (RWC), leaf contents of chlorophyll a, carotenoids, K/Na ratio, photosystem performance index (PIabs), while promoted leaf contents of hydrogen peroxide (H2O2), maloendialdehyde (MDA) and Na”
t0“Aloe vera”
Claim · model-written summary
Foliar applied proline alleviated the deleterious effects of salinity in Aloe vera.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar applied proline was effective in alleviating the deleterious effects of salinity”
t0“Aloe vera”
Claim · model-written summary
Maximum amelioration of salt stress by exogenous proline occurred only in salt-acclimated Aloe vera plants.
- Treatment
- exogenous prolinee0
- Outcome
- amelioration of salt stresse0
- Direction
- Maximume0
- Qualifier
- only in salt-acclimated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum amelioration of salt stress by exogenous proline was found only in salt-acclimated plants”
t0“Aloe vera”
Claim · model-written summary
The proline amelioration in salt-acclimated plants was attributed to reduced leaf Na accumulation together with enhanced K content.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum amelioration of salt stress by exogenous proline was found only in salt-acclimated plants, which was attributed to the reduced leaf Na accumulation together with enhanced K content”
t0“Aloe vera”
Claim · model-written summary
Proline pretreatment improved relative water content of Aloe vera plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline pretreatment improved plant relative water content”
t0“Aloe vera”
Claim · model-written summary
The improvement in relative water content was correlated with enhanced leaf proline concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline pretreatment improved plant relative water content, which was correlated with enhancement in leaf proline concentration”
t0“Aloe vera”
Claim · model-written summary
Proline applied to salt-acclimated stressed plants alleviated salinity damage to PSII, improving oxygen-evolving complex efficiency (Fv/Fo) and quantum yield of electron transport (ΦEo).
- Treatment
- application of prolinee0
- Outcome
- oxygen-evolving complex efficiency of PSII (Fv/Fo) and the quantum yield of electron transport (ΦEo)e0
- Direction
- improvemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of proline on salt-acclimated stressed plants alleviated the damage to PSII functioning induced by salinity, contributing to the improvement of the oxygen-evolving complex efficiency of PSII (Fv/Fo) and the quantum yield of electron transport (ΦEo)”
t0“Aloe vera”
Claim · model-written summary
The improvement of PSII activity was achieved by higher carotenoid and phenolic accumulation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This improvement of PSII activity was achieved by higher carotenoids and phenolic accumulation”
t0“Aloe vera”
Claim · model-written summary
Proline treatment reduced the accumulation of H2O2 and MDA.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline treatment reduced the accumulation of H2O2 and MDA”
t0“Aloe vera”
Claim · model-written summary
Lower oxidative damage under proline pretreatment in salt-exposed acclimated plants was associated with activation of SOD, CAT and APX enzymes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline pretreatment was more effective in lowering oxidative damage in salt-exposed acclimated plants, which was associated with the activation of SOD, CAT and APX enzymes”
t0“Aloe vera”
Claim · model-written summary
The authors conclude that proline pretreatment could protect salt-acclimated Aloe vera against subsequent salt stress by improving the K/Na ratio and water relations and enhancing antioxidant systems.
- Treatment
- proline pretreatmente0
- Outcome
- subsequent salt stresse0
- Qualifier
- improving K/Na ratio and water relations attributes as well as enhancing antioxidant systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline pretreatment could protect salt acclimated Alo vera plants against subsequent salt stress through improving K/Na ratio and water relations attributes as well as enhancing antioxidant systems”
t0“Aloe vera”
The same questions in other papers
salinity · physiology: water · Aloe vera (aloe-vera)Positive and negative results
1 in the opposite direction
- positive
salinity · physiology: oxidative · Aloe vera (aloe-vera)Positive and negative results
1 in the opposite direction
- positive
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.