Abstract
Glucosinolates (GSss) represent bioactive compounds of Brassica vegetables whose health-promoting effects merely stem from their breakdown products, particularly the isothiocyanates (ITCs), released after hydrolysis of GSs by myrosinase. GSs are occasionally discussed as transient S reservoirs, but little is known concerning the interactive effect of S and N supply on ITC concentrations. Therefore, kohlrabi plants were grown in a pot experiment with varied S (0.00, 0.05, and 0.20 g pot (-1)) and N (1, 2, and 4 g pot (-1)) supplies. Plant growth exhibited a classical nutrient response curve with respect to both S and N. The ITC profile of kohlrabi tubers was dominated by methylthiobutyl ITC (11-1350 micromol (g DM) (-1)), followed by sulforaphan (7-120 micromol (g DM) (-1)), phenylethyl ITC (5-34 micromol (g DM) (-1)), and allyl ITC (5-38 micromol (g DM) (-1)), resulting from the hydrolysis of glucoerucin, glucoraphanin, gluconasturtiin, and sinigrin, respectively. The ITC profile was in agreement with reported data, and concentrations of all ITCs were substantially reduced in response to increasing N and decreasing S supply. A growth-induced dilution effect could be ruled out in most cases, and the results do not support the hypothesis that GS acts as transient reservoir with respect to S.
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
Growth followed a classical nutrient response to sulfur supply.
- Taxon
- kohlrabi
Brassica oleracea var. gongylodese1 - Treatment
- Se0
- Outcome
- Plant growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth exhibited a classical nutrient response curve with respect to both S and N.”
e1“kohlrabi plants”
Claim · model-written summary
Growth followed a classical nutrient response to nitrogen supply.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Treatment
- Ne0
- Outcome
- Plant growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant growth exhibited a classical nutrient response curve with respect to both S and N.”
e1“kohlrabi plants”
Claim · model-written summary
Methylthiobutyl ITC dominated the tuber profile at 11–1350 micromol per gram dry matter.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese0
- Organ / stage
- tuberse0
- Outcome
- methylthiobutyl ITCe0
- Direction
- dominatede0
- Value
- 11-1350 micromol (g DM) (-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ITC profile of kohlrabi tubers was dominated by methylthiobutyl ITC (11-1350 micromol (g DM) (-1))”
Claim · model-written summary
Sulforaphan was present at 7–120 micromol per gram dry matter.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Organ / stage
- tuberse1
- Outcome
- sulforaphane0
- Value
- 7-120 micromol (g DM) (-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sulforaphan (7-120 micromol (g DM) (-1))”
e1“kohlrabi tubers”
Claim · model-written summary
Phenylethyl ITC was present at 5–34 micromol per gram dry matter.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Organ / stage
- tuberse1
- Outcome
- phenylethyl ITCe0
- Value
- 5-34 micromol (g DM) (-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phenylethyl ITC (5-34 micromol (g DM) (-1))”
e1“kohlrabi tubers”
Claim · model-written summary
Allyl ITC was present at 5–38 micromol per gram dry matter.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Organ / stage
- tuberse1
- Outcome
- allyl ITCe0
- Value
- 5-38 micromol (g DM) (-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“allyl ITC (5-38 micromol (g DM) (-1))”
e1“kohlrabi tubers”
Claim · model-written summary
Increasing nitrogen supply substantially reduced all ITC concentrations.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Treatment
- increasing Ne0
- Outcome
- concentrations of all ITCse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentrations of all ITCs were substantially reduced in response to increasing N and decreasing S supply.”
e1“kohlrabi tubers”
Claim · model-written summary
Decreasing sulfur supply substantially reduced all ITC concentrations.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Treatment
- decreasing S supplye0
- Outcome
- concentrations of all ITCse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentrations of all ITCs were substantially reduced in response to increasing N and decreasing S supply.”
e1“kohlrabi tubers”
Claim · model-written summary
Growth induced dilution was ruled out in most cases.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Outcome
- growth-induced dilution effecte0
- Qualifier
- in most casese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A growth-induced dilution effect could be ruled out in most cases”
e1“kohlrabi tubers”
Claim · model-written summary
Results did not support a transient sulfur reservoir role for glucosinolates.
- Taxon
- kohlrabiBrassica oleracea var. gongylodese1
- Outcome
- GS acts as transient reservoir with respect to Se0
- Qualifier
- do not support the hypothesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the results do not support the hypothesis that GS acts as transient reservoir with respect to S.”
e1“kohlrabi tubers”
The same questions in other papers
sulfur atom · molecular: metabolites · Brassica oleracea (wild cabbage)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- no effect
- positive
8 papers more in this group
See all 12 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.