Abstract
Effects of root-zone temperatures (RZT) (12°C-RZT and 20°C-RZT) and different N, P, and K nutrient regimes on the growth, reactive oxygen species (ROS), and antioxidant enzyme in cucumber seedlings were investigated in hydroponics. Strong interactions were observed between RZT and nutrient on the dry weight (P=0.001), root length (P=0.001) and leaf area (P=0.05). Plant dry weights were suppressed at low RZT of 12°C, while higher biomass and growth of cucumber seedlings were produced at elevated RZT of 20°C under each nutrient treatment. Growth indexes (plant height, internode length, root length, and leaf area) at 12°C-RZT had less difference among nutrient treatments, but greater response was obtained for different nutrients at high RZT. RZT had larger effects (P=0.001) on cucumber seedling growth than nutrients. In addition, N was more effective nutrients to plant growth than P and K under low root temperature to plant growth. Higher hydrogen peroxide (H2O2), malondialdehyde (MDA), soluble sugar (SS) contents in leaves were observed at 12°C-RZT in all nutrient treatments than those at 20°C-RZT, indicating the chilling adversity damaged to plant growth. In general, antioxidant enzyme had larger response under low root-zone temperature. Superoxide dismutase (SOD) activities were higher in both leaves and roots while peroxidase (POD) and catalase (CAT) showed large different action in leaves and roots at both the two root-zone temperature.
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Claims 9
Claim · model-written summary
Root zone temperature interacted with nutrients for dry weight, root length and leaf area.
- Taxon
- Cucumber Seedling
Cucumis sativust0 - Treatment
- RZT and nutriente0
- Outcome
- dry weighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strong interactions were observed between RZT and nutrient on the dry weight (P=0.001), root length (P=0.001) and leaf area (P=0.05).”
t0“Cucumber Seedling”
Claim · model-written summary
Dry weight was suppressed at 12°C root zone temperature.
- Taxon
- cucumber seedlingsCucumis sativuse0
- Treatment
- low RZT of 12°Ce0
- Outcome
- Plant dry weightse0
- Direction
- suppressede0
- Comparator
- elevated RZT of 20°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant dry weights were suppressed at low RZT of 12°C, while higher biomass and growth of cucumber seedlings were produced at elevated RZT of 20°C under each nutrient treatment.”
Claim · model-written summary
Growth indices differed less among nutrient treatments at 12°C than at high root zone temperature.
- Taxon
- Cucumber SeedlingCucumis sativust0
- Treatment
- 12°C-RZTe0
- Outcome
- Growth indexese0
- Direction
- less differencee0
- Comparator
- high RZTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth indexes (plant height, internode length, root length, and leaf area) at 12°C-RZT had less difference among nutrient treatments, but greater response was obtained for different nutrients at high RZT.”
t0“Cucumber Seedling”
Claim · model-written summary
Root zone temperature affected seedling growth more than nutrients.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- RZTe0
- Outcome
- seedling growthe0
- Direction
- larger effectse0
- Comparator
- nutrientse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RZT had larger effects (P=0.001) on cucumber seedling growth than nutrients.”
Claim · model-written summary
Nitrogen was more effective for growth than phosphorus and potassium under low root temperature.
- Taxon
- Cucumber SeedlingCucumis sativust0
- Treatment
- Ne0
- Outcome
- plant growthe0
- Direction
- more effectivee0
- Qualifier
- low root temperaturee0
- Comparator
- P and Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N was more effective nutrients to plant growth than P and K under low root temperature to plant growth.”
t0“Cucumber Seedling”
Claim · model-written summary
Leaf hydrogen peroxide, malondialdehyde and soluble sugar contents were higher at 12°C than 20°C.
- Taxon
- Cucumber SeedlingCucumis sativust0
- Organ / stage
- leavese0
- Treatment
- 12°C-RZTe0
- Outcome
- hydrogen peroxide (H2O2), malondialdehyde (MDA), soluble sugar (SS) contentse0
- Direction
- Highere0
- Comparator
- 20°C-RZTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher hydrogen peroxide (H2O2), malondialdehyde (MDA), soluble sugar (SS) contents in leaves were observed at 12°C-RZT in all nutrient treatments than those at 20°C-RZT”
t0“Cucumber Seedling”
Claim · model-written summary
Antioxidant enzymes responded more under low root zone temperature.
- Taxon
- Cucumber SeedlingCucumis sativust0
- Treatment
- low root-zone temperaturee0
- Outcome
- antioxidant enzymee0
- Direction
- larger responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“antioxidant enzyme had larger response under low root-zone temperature.”
t0“Cucumber Seedling”
Claim · model-written summary
SOD activities were higher in leaves and roots.
- Taxon
- Cucumber SeedlingCucumis sativust0
- Organ / stage
- leaves and rootse0
- Gene
- Superoxide dismutase (SOD)e0
- Outcome
- activitiese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase (SOD) activities were higher in both leaves and roots”
t0“Cucumber Seedling”
Claim · model-written summary
POD and CAT showed different actions between leaves and roots at the two temperatures.
- Taxon
- Cucumber SeedlingCucumis sativust0
- Organ / stage
- leaves and rootse0
- Gene
- peroxidase (POD) and catalase (CAT)e0
- Outcome
- large different actione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“peroxidase (POD) and catalase (CAT) showed large different action in leaves and roots at both the two root-zone temperature.”
t0“Cucumber Seedling”
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