Abstract
Three onion ( Allium cepa L.) cultivars, `Southport White Globe', `Grano', and `Pukekohe Longkeeper' were grown at low to high S (at 0.5, 1.8, 3.0 or 4.0 meq·L -1 ) in hydroponic culture. Differential solvent extractions of bulbs were used to isolate quantitatively cell contents, cell wall proteins, and cell wall residue. The weight of the cell fractions, their S content, and the S content of intact bulbs were determined. Bulb characteristics of fresh weight (FW), firmness, soluble solids concentration (SSC), and soluble sugars were also determined. For all three cultivars, bulb FW increased with S from 0.5 to 4.0 meq·L -1 . Sulfur had a significant effect on bulb firmness. Onion bulbs grown with S at 0.5 meq·L -1 , the lowest S concentration, were significantly softer than onion bulbs grown at the highest concentration of 4.0 meq·L -1 . Varying the S supply had a major effect on dry weight (DW) allocation to the cell wall residue. Bulbs of all three cultivars grown at the lowest S had significantly less DW in the cell walls compared to S at 3.0 or 4.0 meq·L -1 . In contrast to the effect of S supply on DW allocation, varying S supply had no effect on total bulb S, free SO 4 -2 , and on the S content of the cell contents and the cell wall residue and only a minor effect on cell wall proteins. There was no significant effect of S supply on either SSC or soluble sugars. At low S nutrition, which is limiting to the growth of onion bulbs, cell wall deposition is reduced, with a consequent decrease in bulb firmness. The S composition of the cellular components is maintained at the expense of bulb growth.
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Claims 12
Claim · model-written summary
Onion bulb fresh weight increased as sulfur supply rose from 0.5 to 4.0 meq·L -1.
- Taxon
- Onion
Allium cepat0 - Treatment
- S from 0.5 to 4.0 meq·L -1e0
- Outcome
- bulb FWe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For all three cultivars, bulb FW increased with S from 0.5 to 4.0 meq·L -1”
t0“Onion”
Claim · model-written summary
Sulfur supply significantly affected onion bulb firmness.
- Taxon
- OnionAllium cepat0
- Treatment
- Sulfure0
- Outcome
- bulb firmnesse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sulfur had a significant effect on bulb firmness”
t0“Onion”
Claim · model-written summary
Onion bulbs at 0.5 meq·L -1 sulfur were significantly softer than bulbs at 4.0 meq·L -1.
- Taxon
- OnionAllium cepae0
- Treatment
- S at 0.5 meq·L -1e0
- Outcome
- onion bulbse0
- Direction
- softere0
- Comparator
- highest concentration of 4.0 meq·L -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion bulbs grown with S at 0.5 meq·L -1 , the lowest S concentration, were significantly softer than onion bulbs grown at the highest concentration of 4.0 meq·L -1”
Claim · model-written summary
Bulbs at lowest sulfur had significantly less cell wall dry weight than at 3.0 or 4.0 meq·L -1.
- Taxon
- OnionAllium cepat0
- Treatment
- lowest Se0
- Outcome
- DW in the cell wallse0
- Direction
- lesse0
- Comparator
- S at 3.0 or 4.0 meq·L -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulbs of all three cultivars grown at the lowest S had significantly less DW in the cell walls compared to S at 3.0 or 4.0 meq·L -1”
t0“Onion”
Claim · model-written summary
Varying sulfur supply did not affect total onion bulb sulfur.
- Taxon
- OnionAllium cepat0
- Treatment
- varying S supplye0
- Outcome
- total bulb Se0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varying S supply had no effect on total bulb S, free SO 4 -2 , and on the S content of the cell contents and the cell wall residue”
t0“Onion”
Claim · model-written summary
Varying sulfur supply did not affect free sulfate in onion bulbs.
- Taxon
- OnionAllium cepat0
- Treatment
- varying S supplye0
- Outcome
- free SO 4 -2e0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varying S supply had no effect on total bulb S, free SO 4 -2 , and on the S content of the cell contents and the cell wall residue”
t0“Onion”
Claim · model-written summary
Varying sulfur supply did not affect sulfur content of onion cell contents or cell wall residue.
- Taxon
- OnionAllium cepat0
- Treatment
- varying S supplye0
- Outcome
- S content of the cell contents and the cell wall residuee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varying S supply had no effect on total bulb S, free SO 4 -2 , and on the S content of the cell contents and the cell wall residue”
t0“Onion”
Claim · model-written summary
Sulfur supply had only a minor effect on onion cell wall proteins.
- Taxon
- OnionAllium cepat0
- Treatment
- varying S supplye1
- Outcome
- cell wall proteinse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only a minor effect on cell wall proteins”
e1“varying S supply had no effect on total bulb S”
t0“Onion”
Claim · model-written summary
Sulfur supply had no significant effect on onion soluble solids concentration.
- Taxon
- OnionAllium cepat0
- Treatment
- S supplye0
- Outcome
- SSCe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant effect of S supply on either SSC or soluble sugars”
t0“Onion”
Claim · model-written summary
Sulfur supply had no significant effect on onion soluble sugars.
- Taxon
- OnionAllium cepat0
- Treatment
- S supplye0
- Outcome
- soluble sugarse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant effect of S supply on either SSC or soluble sugars”
t0“Onion”
Claim · model-written summary
Low sulfur nutrition was associated with reduced cell wall deposition and consequent lower bulb firmness.
- Taxon
- onionAllium cepae0
- Treatment
- low S nutritione0
- Outcome
- bulb firmnesse0
- Direction
- decreasee0
- Qualifier
- cell wall deposition is reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low S nutrition, which is limiting to the growth of onion bulbs, cell wall deposition is reduced, with a consequent decrease in bulb firmness”
Claim · model-written summary
Onion cellular sulfur composition was maintained at the expense of bulb growth.
- Taxon
- OnionAllium cepat0
- Outcome
- S composition of the cellular componentse0
- Qualifier
- at the expense of bulb growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The S composition of the cellular components is maintained at the expense of bulb growth”
t0“Onion”
The same questions in other papers
sulfur atom · physiology: osmolytes · Allium cepa (onion)Results differ
1 in the opposite direction
- positive
sulfur atom · molecular: metabolites · Allium cepa (onion)Results differ
6 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 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.