Abstract
Lettuce is an economically important crop for small and medium-sized growers. When grown in adverse environmental conditions, lettuce is vulnerable to a deterioration of yield and quality. Research concerning the impact of elevated potassium (K) levels on leafy vegetables, such as lettuce, is lacking. Therefore, seeds of dark-red ‘Lollo’ lettuce were germinated under greenhouse conditions at 25/20 °C (day/night). Plants were transferred into 11-L containers and placed into growth chambers at 25 and 33 °C. Plants were grown with K treatments of 117.3 (control), 234.6 (2×), 469.2 (4×), and 4) 938.4 (8×) mg·L−1. Increasing K treatments resulted in a negative quadratic response on lettuce dry mass and generated 14% more leaf calcium at 234.6 mg·L−1. An increase in temperature from 25 to 33 °C increased leaf dry matter and biomass by 40% and 43%, respectively. Leaf water content increased by 3% as temperature increased. Plants grown at 33 °C had greater quercetin glycosides compared to plants grown at 25 °C. The results from this study suggest that temperature is a stronger regulatory factor than increasing K in the determination of lettuce yield and quality. Increasing K concentration to 234.6 mg·L−1 results in greater concentrations of leaf minerals without compromising plant yield.
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Claims 8
Claim · model-written summary
Increasing potassium caused a negative quadratic dry-mass response.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- Increasing K treatmentse0
- Outcome
- dry masse0
- Direction
- negative quadratic responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K treatments resulted in a negative quadratic response on lettuce dry mass”
Claim · model-written summary
Potassium at 234.6 mg·L−1 increased leaf calcium by 14%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“generated 14% more leaf calcium at 234.6 mg·L−1”
t0“Effects of Elevated Temperature and Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce”
Claim · model-written summary
Warming from 25 to 33 °C increased leaf dry matter by 40%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 33 °Ce0
- Outcome
- leaf dry mattere0
- Direction
- increasede0
- Value
- 40%e0
- Comparator
- 25e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in temperature from 25 to 33 °C increased leaf dry matter and biomass by 40% and 43%, respectively”
t0“Effects of Elevated Temperature and Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce”
Claim · model-written summary
Warming from 25 to 33 °C increased biomass by 43%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 33 °Ce0
- Outcome
- biomasse0
- Direction
- increasede0
- Value
- 43%e0
- Comparator
- 25e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in temperature from 25 to 33 °C increased leaf dry matter and biomass by 40% and 43%, respectively”
t0“Effects of Elevated Temperature and Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce”
Claim · model-written summary
Increasing temperature raised leaf water content by 3%.
- Taxon
- LettuceLactuca sativat0
- Treatment
- temperaturee0
- Outcome
- Leaf water contente0
- Direction
- increasede0
- Value
- 3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf water content increased by 3% as temperature increased”
t0“Effects of Elevated Temperature and Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce”
Claim · model-written summary
Plants at 33 °C had more quercetin glycosides than plants at 25 °C.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 33 °Ce0
- Outcome
- quercetin glycosidese0
- Direction
- greatere0
- Comparator
- 25 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at 33 °C had greater quercetin glycosides compared to plants grown at 25 °C”
t0“Effects of Elevated Temperature and Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce”
Claim · model-written summary
Temperature was interpreted as a stronger regulator of yield and quality than potassium.
- Taxon
- lettuceLactuca sativae0
- Outcome
- yield and qualitye0
- Direction
- strongere0
- Comparator
- increasing Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“temperature is a stronger regulatory factor than increasing K in the determination of lettuce yield and quality”
Claim · model-written summary
The authors concluded 234.6 mg·L−1 potassium increases leaf minerals without reducing yield.
- Taxon
- LettuceLactuca sativat0
- Treatment
- Increasing K concentration to 234.6 mg·L−1e0
- Outcome
- greater concentrations of leaf minerals without compromising plant yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K concentration to 234.6 mg·L−1 results in greater concentrations of leaf minerals without compromising plant yield”
t0“Effects of Elevated Temperature and Potassium on Biomass and Quality of Dark Red ‘Lollo Rosso’ Lettuce”
The same questions in other papers
potassium · growth · Lactuca sativa (garden lettuce)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- no effect
- positive
7 papers more in this group
See all 11 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.