Abstract
BACKGROUND: Over the last two decades, the area of cultivated super-high-density olive orchards has increased rapidly. Water stress is an important tool in super-high-density orchards to reduce tree growth and promote suitability for overhead mechanical harvesters. Little is known regarding the effect of water stress in super-high-density orchards on oil quality parameters. In this study the effect of irrigation rate on oil quality parameters was evaluated in a six-year-old super-high-density 'Koreneiki' olive orchard for five consecutive seasons. Five water status levels, determined by irrigating in order to maintain various midday stem water potential threshold values (-1.5, -2, -2.5, -3 and -4 MPa), were applied during the oil accumulation stage. RESULTS: The MUFA/PUFA ratio and free fatty acid content generally decreased as a function of increasing tree water stress. In most seasons a reduction in polyphenols was found with decreasing irrigation level. Peroxide value was not affected by the water stress level. CONCLUSION: The present study demonstrates that limiting irrigation and exposure of olive trees to water stress in a super-high-density orchard lowers free fatty acid content and therefore benefits oil quality. However, the decreased MUFA/PUFA ratio and the reduction in polyphenol content that were also found under increased water stress negatively influence oil quality.
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Claims 6
Claim · model-written summary
Olive oil MUFA/PUFA ratio decreased with increasing tree water stress.
- Taxon
- olive
Olea europaeat0 - Treatment
- increasing tree water stresse0
- Outcome
- MUFA/PUFA ratioe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MUFA/PUFA ratio and free fatty acid content generally decreased as a function of increasing tree water stress”
t0“olive oil quality”
Claim · model-written summary
Olive oil free fatty acid content decreased with increasing water stress.
- Taxon
- oliveOlea europaeat0
- Treatment
- increasing tree water stresse0
- Outcome
- free fatty acid contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MUFA/PUFA ratio and free fatty acid content generally decreased as a function of increasing tree water stress”
t0“olive oil quality”
Claim · model-written summary
Olive oil polyphenols declined as irrigation decreased in most seasons.
- Taxon
- oliveOlea europaeat0
- Treatment
- decreasing irrigation levele0
- Outcome
- polyphenolse0
- Direction
- reductione0
- Qualifier
- In most seasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most seasons a reduction in polyphenols was found with decreasing irrigation level”
t0“olive oil quality”
Claim · model-written summary
Water stress did not affect olive oil peroxide value.
- Taxon
- oliveOlea europaeat0
- Treatment
- water stress levele0
- Outcome
- Peroxide valuee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxide value was not affected by the water stress level”
t0“olive oil quality”
Claim · model-written summary
The authors interpret reduced free fatty acid content under limited irrigation as beneficial to oil quality.
- Taxon
- olive treesOlea europaeae0
- Treatment
- limiting irrigatione0
- Outcome
- oil qualitye0
- Qualifier
- lowers free fatty acid contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limiting irrigation and exposure of olive trees to water stress in a super-high-density orchard lowers free fatty acid content and therefore benefits oil quality”
Claim · model-written summary
The authors interpret reduced MUFA/PUFA ratio and polyphenols under stress as harmful to oil quality.
- Taxon
- oliveOlea europaeat0
- Outcome
- oil qualitye0
- Qualifier
- decreased MUFA/PUFA ratio and the reduction in polyphenol contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decreased MUFA/PUFA ratio and the reduction in polyphenol content that were also found under increased water stress negatively influence oil quality”
t0“olive oil quality”
The same questions in other papers
drought · molecular: metabolites · Olea europaea (common olive)Positive and negative results
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- negative
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- positive
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See all 8 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.