Abstract
The Aloe vera plant is an important source of bioactive compounds. Its growing conditions may have a considerable effect on both its physiological and chemical characteristics. Thus, the objective of this study was to evaluate the effect of joint water and salinity stresses (water + salinity) on the main bioactive compounds of the Aloe vera gel, the colorless inner parenchymatous tissue (also known as inner leaf juice), and their related functional properties. Aloe vera plants were treated with two levels of available soil moisture (high and low) and five levels of salinity (0, 20, 40, 60 and 80 mM NaCl). Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0). Total phenolic compounds, aloin, cell wall polysaccharides and water-soluble polymers were the bioactive compounds analyzed along with the antioxidant activity, radical scavenging, swelling, water retention and fat adsorption capacities. In general, the water + salinity stress negatively affected the development and growing process of the plants. However, it did cause a considerable increase in the total amount of dry matter, from 1.0 to 2.1 g/100 g of fresh Aloe vera gel. This increase was mainly due to the synthesis of new polysaccharides, and in particular of water-soluble mannose-rich polymers composed of mannose, galactose and glucose which increased from 194.4 to 345.8 mg/g of water-soluble material as water + salinity stress increased. Further, there was a significant increase in the aloin content, from 10.7 to 19.6 mg/g of total solid contents from Aloe vera gel. These changes in the bioactive compounds were reflected in the functional properties studied. Hydration properties of Aloe vera gel, such as swelling and water retention capacity, exhibited higher values for those plants treated with water deficit and salinity. The antioxidant capacity, determined by FRAP and DPPH methods, was also higher in the gel from stressed plants. Overall, these results show that water + salinity stress could be an agricultural strategy for increasing not only the content of bioactive compounds present in the Aloe vera gel but also for improving their related functional properties.
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Claims 7
Claim · model-written summary
Joint water and salinity stress negatively affected Aloe vera development and growth.
- Treatment
- water + salinity stresse0
- Outcome
- development and growing processe0
- Direction
- negatively affectede0
- Comparator
- HASM-0e2
Aloe veraOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water + salinity stress negatively affected the development and growing process of the plants”
e1“Aloe vera plants were treated”
e2“Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0)”
Claim · model-written summary
Joint stress increased dry matter of fresh Aloe vera gel from 1.0 to 2.1 g/100 g.
- Organ / stage
- gele0
- Treatment
- water + salinity stresse1
- Outcome
- total amount of dry mattere0
- Direction
- increasee0
- Value
- 1.0 to 2.1 g/100 ge0
- Comparator
- HASM-0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in the total amount of dry matter, from 1.0 to 2.1 g/100 g of fresh Aloe vera gel”
e1“the water + salinity stress negatively affected”
e2“Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0)”
Claim · model-written summary
Water-soluble mannose-rich polymers increased from 194.4 to 345.8 mg/g with joint stress.
- Organ / stage
- gele1
- Treatment
- water + salinity stresse0
- Outcome
- water-soluble mannose-rich polymerse0
- Direction
- increasede0
- Value
- 194.4 to 345.8 mg/ge0
- Comparator
- HASM-0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water-soluble mannose-rich polymers composed of mannose, galactose and glucose which increased from 194.4 to 345.8 mg/g of water-soluble material as water + salinity stress increased”
e1“fresh Aloe vera gel”
e2“Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0)”
Claim · model-written summary
Aloin content in Aloe vera gel increased significantly from 10.7 to 19.6 mg/g total solids.
- Organ / stage
- gele0
- Treatment
- water + salinity stresse1
- Outcome
- aloin contente0
- Direction
- increasee0
- Value
- 10.7 to 19.6 mg/ge0
- Comparator
- HASM-0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant increase in the aloin content, from 10.7 to 19.6 mg/g of total solid contents from Aloe vera gel”
e1“the water + salinity stress negatively affected”
e2“Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0)”
Claim · model-written summary
Aloe vera gel from stressed plants had higher swelling and water retention capacity.
- Organ / stage
- gele0
- Treatment
- water deficit and salinitye0
- Outcome
- swelling and water retention capacitye0
- Direction
- highere0
- Comparator
- HASM-0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hydration properties of Aloe vera gel, such as swelling and water retention capacity, exhibited higher values for those plants treated with water deficit and salinity”
e2“Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0)”
Claim · model-written summary
FRAP and DPPH antioxidant capacity of gel was higher in stressed plants.
- Organ / stage
- gele0
- Treatment
- water + salinity stresse2
- Outcome
- antioxidant capacitye0
- Direction
- highere0
- Comparator
- HASM-0e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antioxidant capacity, determined by FRAP and DPPH methods, was also higher in the gel from stressed plants”
e1“fresh Aloe vera gel”
e2“the water + salinity stress negatively affected”
e3“Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0)”
Claim · model-written summary
The authors propose joint water and salinity stress as an agricultural strategy to increase gel bioactives and functional properties.
- Treatment
- water + salinity stresse0
- Outcome
- agricultural strategy for increasing not only the content of bioactive compounds present in the Aloe vera gel but also for improving their related functional propertiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water + salinity stress could be an agricultural strategy for increasing not only the content of bioactive compounds present in the Aloe vera gel but also for improving their related functional properties”
The same questions in other papers
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salinity · growth · Aloe vera (aloe-vera)Positive and negative results
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6 papers more in this group
See all 10 papers →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.