Abstract
Abstract Lettuce was grown in a complete nutrient solution, with Zn increased stepwise by a factor of 2 for 8 treatments from 1.6 to 200 μ g/liter. Forty-seven days after imbibition the plants were harvested and separated into 6 parts for tissue analysis. The plants in the low Zn solutions were stunted in growth and showed a marginal purpling and a rupture of laticifers on the margins of the mature leaves. The symptoms progressed from an overall chlorosis to an interveinal necrosis; with the dark desiccated areas eventually coalescing to cover most of the leaf. The Zn nutrient status of the lettuce plant was best defined by determining the Zn concentration in the mature petiole (mid-rib). The critical level of Zn in the mature petiole is 9 ppm. Concentration of Zn in this tissue below 9 ppm indicates an unfavorable Zn nutrient status for the vegetative growth of lettuce.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. 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 6
Claim · model-written summary
Low Zn solutions stunted lettuce growth.
- Taxon
- Lettuce
Lactuca sativae0 - Treatment
- low Zn solutionse1
- Outcome
- growthe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce was grown in a complete nutrient solution”
e1“The plants in the low Zn solutions were stunted in growth and showed a marginal purpling and a rupture of laticifers on the margins of the mature leaves”
Claim · model-written summary
Low Zn plants showed marginal purpling and a rupture of laticifers on the margins of mature leaves.
- Taxon
- LettuceLactuca sativae0
- Organ / stage
- mature leavese1
- Treatment
- low Zn solutionse1
- Outcome
- marginal purpling and a rupture of laticiferse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce was grown in a complete nutrient solution”
e1“The plants in the low Zn solutions were stunted in growth and showed a marginal purpling and a rupture of laticifers on the margins of the mature leaves”
Claim · model-written summary
Low Zn symptoms progressed from overall chlorosis to interveinal necrosis.
- Taxon
- LettuceLactuca sativae0
- Treatment
- low Zn solutionse1
- Outcome
- symptomse2
- Qualifier
- from an overall chlorosis to an interveinal necrosise2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce was grown in a complete nutrient solution”
e1“The plants in the low Zn solutions were stunted in growth”
e2“The symptoms progressed from an overall chlorosis to an interveinal necrosis”
Claim · model-written summary
The Zn nutrient status of lettuce is best defined by the Zn concentration in the mature petiole.
- Taxon
- lettuce plantLactuca sativae3
- Organ / stage
- mature petiolee3
- Outcome
- Zn nutrient statuse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The Zn nutrient status of the lettuce plant was best defined by determining the Zn concentration in the mature petiole (mid-rib)”
Claim · model-written summary
The critical level of Zn in the mature petiole of lettuce is 9 ppm.
- Taxon
- LettuceLactuca sativae0
- Organ / stage
- mature petiolee4
- Outcome
- critical level of Zne4
- Value
- 9 ppme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce was grown in a complete nutrient solution”
e4“The critical level of Zn in the mature petiole is 9 ppm”
Claim · model-written summary
Zn concentration in the mature petiole below 9 ppm indicates an unfavorable Zn nutrient status for lettuce vegetative growth.
- Taxon
- lettuceLactuca sativae5
- Compound
- Zne5
- Outcome
- Zn nutrient statuse5
- Direction
- unfavorablee5
- Value
- 9 ppme5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Concentration of Zn in this tissue below 9 ppm indicates an unfavorable Zn nutrient status for the vegetative growth of lettuce”
The same questions in other papers
zinc atom · growth · Lactuca sativa (garden lettuce)Results differ
7 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
11 papers more in this group
See all 15 papers →zinc atom · disease · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- negative
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.