Abstract
The evergreen tree olive (Olea europaea L.) is the only species of the genus Olea that produces edible fruits with high ecological and economic value. This tree species has developed a series of physiochemical mechanisms to tolerate drought stress and grow under adverse climatic environments. One of these mechanisms is photosynthesis activities, so that as yet little information achieved about the relations between olive production and photosynthetic parameters under drought conditions. An experiment was carried out during two consecutive years (2015–2017) to study the response of 20 different olive tree cultivars (Olea europaea L.) to drought stress. Several parameters like net photosynthetic rate (PN), stomatal conductance (GS), transpiration rate (TE), photosynthetic pigments (total chlorophyll, chlorophyll a, b and carotenoid) and fruit yield were measured. The results of combined analysis of variance for fruit yield and other measured traits showed that year, drought treatment, cultivar main effects and their interactions were highly significant. The results indicated that drought stress reduced all traits, however GS (42.80%), PN (37.21%) and TE (37.17%) significantly affected by drought. Lower reduction in photosynthetic performance (PN, GS and TE) in the cultivar T7 compared to other olive cultivars allowed them to maintain better fruit yield. Principal component analysis (PCA) identified two PCs that accounted for 82.04 and 83.27% of the total variation in photosynthetic parameters under optimal and drought stress conditions, respectively. Taken together, mean comparison, relative changes due to drought and biplot analysis revealed that cultivars ‘T7’, ‘Roghani’, ‘Koroneiki’, ‘Korfolia’ and ‘Abou-satl’ displayed better response against drought stress. According to our results, one olive cultivar namely ‘T7’, could be used in olive breeding programs to improve new high yielding cultivars with drought tolerance for use in the drought-prone environments.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Year, drought, cultivar, and their interactions significantly affected fruit yield and measured traits.
- Taxon
- Olea europaea L.
Olea europaeat0 - Treatment
- drought treatmente0
- Outcome
- FRUIT YIELD AND PHOTOSYNTHESIS PARAMETERSt0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“year, drought treatment, cultivar main effects and their interactions were highly significant”
t0“FRUIT YIELD AND PHOTOSYNTHESIS PARAMETERS IN DIFFERENT OLIVE CULTIVARS (Olea europaea L.)”
t1“FRUIT YIELD AND PHOTOSYNTHESIS PARAMETERS IN DIFFERENT OLIVE CULTIVARS (Olea europaea L.)”
Claim · model-written summary
Drought reduced all measured traits in olive cultivars.
- Taxon
- Olea europaea L.Olea europaeat0
- Treatment
- drought stresse0
- Outcome
- all traitse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress reduced all traits”
t0“(Olea europaea L.)”
t1“(Olea europaea L.)”
Claim · model-written summary
Drought affected stomatal conductance by 42.80%.
- Taxon
- Olea europaea L.Olea europaeat0
- Treatment
- drought stresse1
- Outcome
- GSe0
- Direction
- reducede1
- Value
- 42.80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GS (42.80%)”
t0“(Olea europaea L.) UNDER CON-TRASTING WATER REGIMES”
t1“(Olea europaea L.) UNDER CON-TRASTING WATER REGIMES”
e1“drought stress reduced all traits”
Claim · model-written summary
Drought affected net photosynthetic rate by 37.21%.
- Taxon
- Olea europaea L.Olea europaeat0
- Treatment
- drought stresse1
- Outcome
- PNe0
- Value
- 37.21%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PN (37.21%)”
t0“(Olea europaea L.) UNDER CON-TRASTING WATER REGIMES”
t1“(Olea europaea L.) UNDER CON-TRASTING WATER REGIMES”
e1“drought stress reduced all traits”
Claim · model-written summary
Drought affected transpiration rate by 37.17%.
- Taxon
- Olea europaea L.Olea europaeat0
- Outcome
- TEe0
- Value
- 37.17%e0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TE (37.17%)”
t0“(Olea europaea L.)”
t1“(Olea europaea L.)”
Claim · model-written summary
T7 had a lower reduction in photosynthetic performance than other olive cultivars.
- Taxon
- oliveOlea europaeae0
- Material
- T7e0
- Outcome
- photosynthetic performance (PN, GS and TE)e0
- Direction
- Lower reductione0
- Comparator
- other olive cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower reduction in photosynthetic performance (PN, GS and TE) in the cultivar T7 compared to other olive cultivars”
Claim · model-written summary
T7 maintained better fruit yield than other olive cultivars.
- Taxon
- oliveOlea europaeae0
- Material
- T7e1
- Outcome
- fruit yielde0
- Direction
- bettere0
- Comparator
- other olive cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to other olive cultivars allowed them to maintain better fruit yield”
t0“OLIVE CULTIVARS (Olea europaea L.) UNDER CON-TRASTING WATER REGIMES”
t1“OLIVE CULTIVARS (Olea europaea L.) UNDER CON-TRASTING WATER REGIMES”
e1“Lower reduction in photosynthetic performance (PN, GS and TE) in the cultivar T7 compared to other olive cultivars”
Claim · model-written summary
Two principal components accounted for 82.04% of photosynthetic variation under optimal conditions.
- Taxon
- Olea europaea L.Olea europaeat0
- Outcome
- total variation in photosynthetic parameterse0
- Value
- 82.04e0
- Qualifier
- optimale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two PCs that accounted for 82.04 and 83.27% of the total variation in photosynthetic parameters under optimal and drought stress conditions, respectively”
t0“(Olea europaea L.)”
t1“(Olea europaea L.)”
Claim · model-written summary
Two principal components accounted for 83.27% of photosynthetic variation under drought.
- Taxon
- Olea europaea L.Olea europaeat0
- Outcome
- total variation in photosynthetic parameterse0
- Value
- 83.27%e0
- Qualifier
- drought stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two PCs that accounted for 82.04 and 83.27% of the total variation in photosynthetic parameters under optimal and drought stress conditions, respectively”
t0“(Olea europaea L.)”
t1“(Olea europaea L.)”
Claim · model-written summary
T7, Roghani, and Koroneiki had better drought responses.
- Taxon
- Olea europaea L.Olea europaeat0
- Material
- T7e0
- Outcome
- response against drought stresse0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars ‘T7’, ‘Roghani’, ‘Koroneiki’, ‘Korfolia’ and ‘Abou-satl’ displayed better response against drought stress”
t0“(Olea europaea L.)”
t1“(Olea europaea L.)”
Claim · model-written summary
The authors proposed T7 for breeding high-yielding drought-tolerant olive cultivars.
- Taxon
- oliveOlea europaeae0
- Material
- T7e0
- Outcome
- used in olive breeding programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one olive cultivar namely ‘T7’, could be used in olive breeding programs to improve new high yielding cultivars with drought tolerance”
The same questions in other papers
drought · physiology: photosynthesis · Olea europaea (common olive)Results differ
14 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
12 papers more in this group
See all 16 papers →drought · physiology: gas exchange · Olea europaea (common olive)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
3 papers more in this group
See all 7 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.