Abstract
Low temperatures can inhibit plant growth and development, and cause physiological problems by damaging membrane lipids, proteins, and nucleic acids. A factorial experiment based on a complete randomized design with five replicates investigated the effect of root zone temperature and nitrogen ratio on sweet pepper seedlings in soilless culture. Treatments include root zone temperature (15, 25 (optimum), and 35 °C) and different nitrogen levels: 50, 75, and 100% (optimum) of N Johnson nutrient solution. The results showed that growth parameters including root fresh weight, shoot dry weight, and root volume reduced more at 15 °C with nitrogen level reduction compared with 35 °C. Photosynthetic characteristics like photosynthetic rate, transpiration, mesophyll conductivity, and photosynthetic water use efficiency were not affected by nitrogen levels at 25 and 35 °C. Also, higher photosynthetic traits, including greenness index, photosynthesis rate, and mesophyll conductance, were obtained with N50% at 15 °C. Shoot phenol increased by 55% at N 50% compared with N 100% at 35 °C. Sweet peppers seedlings were more sensitive to high root zone temperature of 35 °C. Heat stress and nitrogen deficiency in the root zone ambient led to poor growth, lower photosynthetic capacity, higher phenolic compound, lower nitrate reductase activity, and higher nitrogen compound in evaluated seedlings. Nitrate reductase activity was affected by heat stress and significantly decreased at 35 °C. The phosphorous and potassium concentration was reduced by nitrogen reduction at 35 °C. Conclusively, a lower nitrogen level in the nutrient solution can be used for sweet pepper seedlings’ growth if the temperature of the nutrient solution is decreased to 15 °C.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 10
Claim · model-written summary
At 15 °C, nitrogen reduction reduced root fresh weight, shoot dry weight and root volume more than at 35 °C.
- Taxon
- sweet pepper
Capsicum annuume1 - Treatment
- nitrogen level reductione0
- Outcome
- root fresh weight, shoot dry weight, and root volumee0
- Direction
- reduced moree0
- Comparator
- 35 °Ce0
Not reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth parameters including root fresh weight, shoot dry weight, and root volume reduced more at 15 °C with nitrogen level reduction compared with 35 °C”
e1“on sweet pepper”
Claim · model-written summary
Nitrogen levels did not affect photosynthetic rate, transpiration, mesophyll conductivity or water use efficiency at 25 and 35 °C.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- nitrogen levelse0
- Outcome
- photosynthetic rate, transpiration, mesophyll conductivity, and photosynthetic water use efficiencye0
- Direction
- not affectede0
- Qualifier
- 25 and 35 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic characteristics like photosynthetic rate, transpiration, mesophyll conductivity, and photosynthetic water use efficiency were not affected by nitrogen levels at 25 and 35 °C”
e1“on sweet pepper”
Claim · model-written summary
At 15 °C, N50% yielded higher greenness index, photosynthesis rate and mesophyll conductance.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- N50%e0
- Outcome
- greenness index, photosynthesis rate, and mesophyll conductancee0
- Direction
- highere0
- Qualifier
- 15 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher photosynthetic traits, including greenness index, photosynthesis rate, and mesophyll conductance, were obtained with N50% at 15 °C”
e1“on sweet pepper”
Claim · model-written summary
At 35 °C, N 50% increased shoot phenol by 55% against N 100%.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- N 50%e0
- Outcome
- Shoot phenole0
- Direction
- increasede0
- Value
- 55%e0
- Qualifier
- 35 °Ce0
- Comparator
- N 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot phenol increased by 55% at N 50% compared with N 100% at 35 °C”
e1“on sweet pepper”
Claim · model-written summary
Seedlings were more sensitive to a root zone temperature of 35 °C.
- Taxon
- Sweet peppersCapsicum annuume0
- Outcome
- more sensitive to high root zone temperature of 35 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweet peppers seedlings were more sensitive to high root zone temperature of 35 °C”
Claim · model-written summary
Heat stress and nitrogen deficiency caused poor growth and lower photosynthetic capacity.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- Heat stress and nitrogen deficiencye0
- Outcome
- poor growth, lower photosynthetic capacitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress and nitrogen deficiency in the root zone ambient led to poor growth, lower photosynthetic capacity, higher phenolic compound, lower nitrate reductase activity, and higher nitrogen compound in evaluated seedlings”
e1“on sweet pepper”
Claim · model-written summary
Heat stress and nitrogen deficiency raised phenolic compound and nitrogen compound.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- Heat stress and nitrogen deficiencye0
- Outcome
- phenolic compound, lower nitrate reductase activity, and higher nitrogen compounde0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress and nitrogen deficiency in the root zone ambient led to poor growth, lower photosynthetic capacity, higher phenolic compound, lower nitrate reductase activity, and higher nitrogen compound in evaluated seedlings”
e1“on sweet pepper”
Claim · model-written summary
Nitrate reductase activity decreased significantly at 35 °C.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- heat stresse0
- Outcome
- Nitrate reductase activitye0
- Direction
- decreasede0
- Qualifier
- 35 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity was affected by heat stress and significantly decreased at 35 °C”
e1“on sweet pepper”
Claim · model-written summary
Nitrogen reduction at 35 °C reduced phosphorus and potassium concentration.
- Taxon
- sweet pepperCapsicum annuume1
- Treatment
- nitrogen reductione0
- Outcome
- phosphorous and potassium concentratione0
- Direction
- reducede0
- Qualifier
- 35 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phosphorous and potassium concentration was reduced by nitrogen reduction at 35 °C”
e1“on sweet pepper”
Claim · model-written summary
The authors recommend lower nitrogen nutrient solution for seedlings when solution temperature is 15 °C.
- Taxon
- sweet pepperCapsicum annuume0
- Outcome
- a lower nitrogen level in the nutrient solution can be usede0
- Qualifier
- 15 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a lower nitrogen level in the nutrient solution can be used for sweet pepper seedlings’ growth if the temperature of the nutrient solution is decreased to 15 °C”
The same questions in other papers
nitrogen · physiology: photosynthesis · Capsicum annuum (sweet pepper)Positive and negative results
1 in the opposite direction
- negative
nitrogen · nutrient: content · Capsicum annuum (sweet pepper)Positive and negative results
1 paper in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →nitrogen · growth · Capsicum annuum (sweet pepper)Positive and negative results
6 papers in the same direction as this paper · 21 in the opposite direction
- positive
- positive
- positive
24 papers more in this group
See all 28 papers →heat · physiology: photosynthesis · Capsicum annuum (sweet pepper)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.