Abstract
The present study was conducted to evaluate the effects of partial root-zone drying (PRD) irrigation technique on stomatal conductance (gs), leaf water potential (pd), leaf relative water content (RWC), vegetative growth, fruit quality and enzymatic antioxidants of young plants of four Olea europaea L. varieties (Picholine Marocaine, Haouzia, Picholine Languedoc and Manzanilla) grown under arid conditions in Southern Morocco. In this irrigation strategy, a split-root technique was used to divide the root system of the plants in two parts. Two water regimes were used: (1) control, with both root compartments well watered; (2) PRD, with one compartment irrigated (50% of the control), the other compartment was kept dry switching every 10 days. For all olive varieties studied, gs and the shoot length of the plants subjected to PRD decreased, whereas, pd and RWC remained higher. The effect of PRD was similar among the four olive varieties, with their stomata closing in response to the water deficit before any significant changes in leaf water status were detectable. At the agronomic level, the benefits of PRD on olive were expressed by an earlier maturity and by higher values of olive fruit weight and dimensions, especially, in Manzanilla, which produced a fruit reaching 7.1 g and 2.6 cm, respectively. The enzymatic activities of soluble peroxidases (POX), insoluble peroxidases (POXins), polyphenoloxidase (PPO) and superoxide dismutase (SOD) were up-regulated under PRD. Picholine Marocaine and Haouzia showed higher enzymatic activities revealing that in these two varieties, PRD had possibly induced oxidative stress, which resulted in an up-regulation of the antioxidant activities of POXins, POX, PPO and SOD under water deficit.
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Claims 8
Claim · model-written summary
Olive stomata closed in response to water deficit before significant changes in leaf water status were detectable.
- Taxon
- Olea europaea
Olea europaeae0 - Outcome
- stomata closinge5
- Qualifier
- before any significant changes in leaf water status were detectablee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young plants of four Olea europaea L. varieties (Picholine Marocaine, Haouzia, Picholine Languedoc and Manzanilla) grown under arid conditions in Southern Morocco”
e5“with their stomata closing in response to the water deficit before any significant changes in leaf water status were detectable”
Claim · model-written summary
Partial root-zone drying gave an earlier maturity of olive fruit than the control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“(1) control, with both root compartments well watered”
e6“At the agronomic level, the benefits of PRD on olive were expressed by an earlier maturity and by higher values of olive fruit weight and dimensions, especially, in Manzanilla, which produced a fruit reaching 7.1 g and 2.6 cm, respectively”
Claim · model-written summary
Partial root-zone drying gave higher olive fruit weight in Manzanilla, reaching 7.1 g, than the control.
- Taxon
- oliveOlea europaeae6
- Material
- Manzanillae6
- Treatment
- PRDe6
- Outcome
- olive fruit weighte6
- Direction
- highere6
- Value
- 7.1 ge6
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“(1) control, with both root compartments well watered”
e6“At the agronomic level, the benefits of PRD on olive were expressed by an earlier maturity and by higher values of olive fruit weight and dimensions, especially, in Manzanilla, which produced a fruit reaching 7.1 g and 2.6 cm, respectively”
Claim · model-written summary
Partial root-zone drying gave higher olive fruit dimensions in Manzanilla, reaching 2.6 cm, than the control.
- Taxon
- oliveOlea europaeae6
- Material
- Manzanillae6
- Treatment
- PRDe6
- Outcome
- dimensionse6
- Direction
- highere6
- Value
- 2.6 cme6
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“(1) control, with both root compartments well watered”
e6“At the agronomic level, the benefits of PRD on olive were expressed by an earlier maturity and by higher values of olive fruit weight and dimensions, especially, in Manzanilla, which produced a fruit reaching 7.1 g and 2.6 cm, respectively”
Claim · model-written summary
Partial root-zone drying up-regulated soluble peroxidases (POX), insoluble peroxidases (POXins) and polyphenoloxidase (PPO) in olive compared with the control.
- Taxon
- Olea europaeaOlea europaeae0
- Treatment
- PRDe7
- Outcome
- soluble peroxidases (POX), insoluble peroxidases (POXins), polyphenoloxidase (PPO)e7
- Direction
- up-regulatede7
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young plants of four Olea europaea L. varieties (Picholine Marocaine, Haouzia, Picholine Languedoc and Manzanilla) grown under arid conditions in Southern Morocco”
e2“(1) control, with both root compartments well watered”
e7“The enzymatic activities of soluble peroxidases (POX), insoluble peroxidases (POXins), polyphenoloxidase (PPO) and superoxide dismutase (SOD) were up-regulated under PRD”
Claim · model-written summary
Partial root-zone drying up-regulated superoxide dismutase (SOD) in olive compared with the control.
- Taxon
- Olea europaeaOlea europaeae0
- Treatment
- PRDe7
- Outcome
- superoxide dismutase (SOD)e7
- Direction
- up-regulatede7
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young plants of four Olea europaea L. varieties (Picholine Marocaine, Haouzia, Picholine Languedoc and Manzanilla) grown under arid conditions in Southern Morocco”
e2“(1) control, with both root compartments well watered”
e7“The enzymatic activities of soluble peroxidases (POX), insoluble peroxidases (POXins), polyphenoloxidase (PPO) and superoxide dismutase (SOD) were up-regulated under PRD”
Claim · model-written summary
Picholine Marocaine and Haouzia olive varieties showed higher enzymatic activities than the other varieties under partial root-zone drying.
- Taxon
- Olea europaeaOlea europaeae0
- Material
- Picholine Marocaine and Haouziae4
- Outcome
- enzymatic activitiese4
- Direction
- highere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young plants of four Olea europaea L. varieties (Picholine Marocaine, Haouzia, Picholine Languedoc and Manzanilla) grown under arid conditions in Southern Morocco”
e4“Picholine Marocaine and Haouzia showed higher enzymatic activities revealing that in these two varieties”
Claim · model-written summary
Partial root-zone drying possibly induced oxidative stress, which up-regulated antioxidant activities of POXins, POX, PPO and SOD under water deficit.
- Taxon
- Olea europaeaOlea europaeae0
- Treatment
- PRDe1
- Outcome
- antioxidant activitiese1
- Qualifier
- possibly induced oxidative stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young plants of four Olea europaea L. varieties (Picholine Marocaine, Haouzia, Picholine Languedoc and Manzanilla) grown under arid conditions in Southern Morocco”
e1“PRD had possibly induced oxidative stress, which resulted in an up-regulation of the antioxidant activities of POXins, POX, PPO and SOD under water deficit”
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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.