Abstract
2 Abstract: Pot experiments were conducted on cucumber (Cucumis sativus L.) plants in the green house of the National Research Center. Dokki, Giza, Egypt to assess the impacts of low temperature on cucumber plants cultivated in January 2007 and 2008 to achieve early production during April. To alleviate the harmful effect of low temperature, salicylic acid (2, 4mM) and paclobutrazol (25, 50 mg/l) were investigated. The work concerned to study the effect of salicylic acid or paclobutrazol separately on growth criteria (plant height, number of leaves, fresh and dry weights of leaves and stems and leaf area of cucumber/ plant), plant survival, photosynthetic pigments, antioxidant enzyme (CAT, POX, APX and GR) activities, lipid peroxidation, electrolyte leakage and yield. Obtained results revealed that plants grown under low temperature and foliarly treated after transplanting with SA at the concentration of 4mM followed by 2mM and paclobutrazol at the concentration of 25 mg/l mitigated the harmful effects of low temperature stress through the enhancement of their protective parameters, such as antioxidant enzymes activity and caratenoids. SA at 4mM recorded the highest increments in GR and APX activities, survival percentage and carotenoids contents. Meanwhile, PBZ at 25mg/l recorded the highest increments in POX and CAT activities, chl. a and b. Remarkable decreases were also recorded in MDA and electrolyte leakage (EL) with SA and PBZ treatments. The results also, showed that the highest value of yield per plant was recorded with plants received Salicylic acid at the concentration of 4mM. Based on the obtained results, it could be suggested that the protection mechanism had helped the plants to increase their tolerance against low temperature stress, through mainly the decrease in membrane damage symptoms leading to intercellular osmotic adjustment.
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Claims 6
Claim · model-written summary
Salicylic acid at 4 mM most increased GR, APX, survival, and carotenoids.
- Taxon
- Cucumber
Cucumis sativust0 - Treatment
- SA at 4mMe0
- Outcome
- GR and APX activities, survival percentage and carotenoids contentse0
- Direction
- highest incrementse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA at 4mM recorded the highest increments in GR and APX activities, survival percentage and carotenoids contents”
t0“Cucumber”
Claim · model-written summary
Paclobutrazol at 25 mg/l most increased POX, CAT, and chlorophyll.
- Taxon
- CucumberCucumis sativust0
- Treatment
- PBZ at 25mg/le0
- Outcome
- POX and CAT activities, chl. a and be0
- Direction
- highest incrementse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ at 25mg/l recorded the highest increments in POX and CAT activities, chl. a and b”
t0“Cucumber”
Claim · model-written summary
Salicylic acid reduced MDA and electrolyte leakage.
- Taxon
- CucumberCucumis sativust0
- Treatment
- SAe0
- Outcome
- MDA and electrolyte leakage (EL)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Remarkable decreases were also recorded in MDA and electrolyte leakage (EL) with SA and PBZ treatments”
t0“Cucumber”
Claim · model-written summary
Paclobutrazol reduced MDA and electrolyte leakage.
- Taxon
- CucumberCucumis sativust0
- Treatment
- PBZe0
- Outcome
- MDA and electrolyte leakage (EL)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Remarkable decreases were also recorded in MDA and electrolyte leakage (EL) with SA and PBZ treatments”
t0“Cucumber”
Claim · model-written summary
Salicylic acid at 4 mM produced the highest yield per plant.
- Taxon
- CucumberCucumis sativust0
- Treatment
- Salicylic acid at the concentration of 4mMe0
- Outcome
- yield per plante0
- Direction
- highest valuee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest value of yield per plant was recorded with plants received Salicylic acid at the concentration of 4mM”
t0“Cucumber”
Claim · model-written summary
Protection was suggested to improve cold tolerance by lowering membrane damage.
- Taxon
- CucumberCucumis sativust0
- Outcome
- increase their tolerance against low temperature stresse0
- Qualifier
- decrease in membrane damage symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protection mechanism had helped the plants to increase their tolerance against low temperature stress, through mainly the decrease in membrane damage symptoms”
t0“Cucumber”
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