Abstract
The negative impacts of extreme heat and drought on olive plants have driven the quest for mitigation approaches based on the use of biostimulants, which have proved to be effective in contrasting environmental stresses. The aim of our study was to evaluate the effectiveness of six biostimulants in mitigating high temperature and water stress in young olive trees in terms of vegetative and eco-physiological parameters as well as bioactive compound content. Biostimulants based on glycine betaine and macro- and micro-algae effectively protected the plants from abiotic stress by improving their eco-physiological and vegetative parameters. At the end of the growing season, olive plants were experiencing water deficit which had built up through the summer months. At this time, the glycine betaine-treated plants had a three-fold higher stomatal conductance compared with the control, while plants sprayed with the seaweed mix had a relative water content 33% higher than the control. The kaolin treatment resulted in higher total phenolics and antioxidant activities (DPPH, FRAP and ABTS) in water stress conditions and caused an increase of 238.53 and 443.49% in leaves total polyphenols content in 100% and 50% water regime, respectively. This study showed the effectiveness of biostimulants in mitigating the damage from abiotic stress on young olive trees, by improving some vegetative, eco-physiological and leaf nutraceutical parameters. Further studies are needed to test the efficiency of these biostimulants in open field conditions on olive trees in full production.
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Claims 9
Claim · model-written summary
Glycine betaine biostimulant improved olive eco-physiological and vegetative parameters under abiotic stress.
- Taxon
- Olive
Olea europaeat0 - Treatment
- glycine betainee0
- Outcome
- eco-physiological and vegetative parameterse0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biostimulants based on glycine betaine and macro- and micro-algae effectively protected the plants from abiotic stress by improving their eco-physiological and vegetative parameters”
t0“Young Olive Trees”
Claim · model-written summary
Macro- and micro-algae biostimulant improved olive eco-physiological and vegetative parameters under abiotic stress.
- Taxon
- OliveOlea europaeat0
- Treatment
- macro- and micro-algaee0
- Outcome
- eco-physiological and vegetative parameterse0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biostimulants based on glycine betaine and macro- and micro-algae effectively protected the plants from abiotic stress by improving their eco-physiological and vegetative parameters”
t0“Young Olive Trees”
Claim · model-written summary
Olive plants experienced a water deficit by the end of the growing season.
- Taxon
- oliveOlea europaeae0
- Outcome
- water deficite0
- Qualifier
- end of the growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of the growing season, olive plants were experiencing water deficit which had built up through the summer months”
Claim · model-written summary
Glycine betaine treated plants had three-fold higher stomatal conductance than controls.
- Taxon
- oliveOlea europaeae1
- Treatment
- glycine betainee0
- Outcome
- stomatal conductancee0
- Direction
- highere0
- Value
- three-folde0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glycine betaine-treated plants had a three-fold higher stomatal conductance compared with the control”
e1“At the end of the growing season, olive plants”
Claim · model-written summary
Seaweed mix raised relative water content 33% above control.
- Taxon
- oliveOlea europaeae1
- Treatment
- seaweed mixe0
- Outcome
- relative water contente0
- Direction
- highere0
- Value
- 33%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants sprayed with the seaweed mix had a relative water content 33% higher than the control”
e1“At the end of the growing season, olive plants”
Claim · model-written summary
Kaolin increased total phenolics under water stress.
- Taxon
- oliveOlea europaeae1
- Treatment
- kaoline0
- Outcome
- total phenolicse0
- Direction
- highere0
- Qualifier
- water stress conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kaolin treatment resulted in higher total phenolics and antioxidant activities (DPPH, FRAP and ABTS) in water stress conditions”
e1“At the end of the growing season, olive plants”
Claim · model-written summary
Kaolin increased antioxidant activities under water stress.
- Taxon
- oliveOlea europaeae1
- Treatment
- kaoline0
- Outcome
- antioxidant activities (DPPH, FRAP and ABTS)e0
- Direction
- highere0
- Qualifier
- water stress conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kaolin treatment resulted in higher total phenolics and antioxidant activities (DPPH, FRAP and ABTS) in water stress conditions”
e1“At the end of the growing season, olive plants”
Claim · model-written summary
Kaolin increased leaf total polyphenols by 238.53% under a 100% water regime.
- Taxon
- oliveOlea europaeae1
- Treatment
- kaoline0
- Outcome
- leaves total polyphenols contente0
- Direction
- increasee0
- Value
- 238.53e0
- Qualifier
- 100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kaolin treatment resulted in higher total phenolics and antioxidant activities (DPPH, FRAP and ABTS) in water stress conditions and caused an increase of 238.53 and 443.49% in leaves total polyphenols content in 100% and 50% water regime, respectively”
e1“At the end of the growing season, olive plants”
Claim · model-written summary
Kaolin increased leaf total polyphenols by 443.49% under a 50% water regime.
- Taxon
- oliveOlea europaeae1
- Treatment
- kaoline0
- Outcome
- leaves total polyphenols contente0
- Direction
- increasee0
- Value
- 443.49%e0
- Qualifier
- 50% water regimee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kaolin treatment resulted in higher total phenolics and antioxidant activities (DPPH, FRAP and ABTS) in water stress conditions and caused an increase of 238.53 and 443.49% in leaves total polyphenols content in 100% and 50% water regime, respectively”
e1“At the end of the growing season, olive plants”
The same questions in other papers
kaolin · quality: phytochemicals · Olea europaea (common olive)Results agree
3 papers in the same direction as this paper
- positive
- positive
- 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.