Abstract
Glucosinolates are sulfur-containing secondary plant metabolites commonly found in the family Brassicaceae. The presence of selenium in soils increases the uptake of sulfur and inhibits the production of glucosinolates in brassicaceous plants. This study was undertaken to determine the extent of selenium's impact on sulfur uptake and glucosinolate production in Brassica oleracea L. Rapid-cycling B. oleracea plants were grown hydroponically in half-strength Hoagland's nutrient solution with selenium treatments delivered as sodium selenate concentrations of 0.0, 0.5, 0.75, 1.0, and 1.5 mg·L −1 . Elevated sulfur treatments of 37 mg·L −1 sulfate and 37 mg·L −1 sulfate/0.75 mg·L −1 selenate were incorporated to compare with selenium treatments. Plants were harvested and freeze-dried 1 day before anthesis. Selenium and sulfur content of plant tissue was determined by flame atomic absorption spectrophotometry and a carbon–nitrogen–sulfur analyzer. Glucosinolate content of leaf tissue was determined by high-performance liquid chromatography. Selenium and sulfur uptake in plants positively correlated with selenium concentration in the nutrient solution. The sulfur concentration of plants exposed to selenium equaled or exceeded the sulfur concentration of plants exposed to elevated sulfur. Despite higher sulfur concentrations, there occurred a statistically significant decrease in production of five of the seven glucosinolates analyzed in selenium-enriched plants. Plants that underwent elevated sulfur treatments had higher glucosinolate production than selenium-treated plants. These results suggest that selenium either upregulates or prevents the downregulation of sulfur uptake in B. oleracea . In addition, the presence of selenium within the plant appears to have a negative impact on the production of certain glucosinolates despite adequate availability of sulfur.
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Claims 6
Claim · model-written summary
Selenium and sulfur uptake positively correlated with selenium concentration in the nutrient solution.
- Taxon
- Brassica oleracea
Brassica oleraceat0 - Treatment
- selenium concentration in the nutrient solutione0
- Outcome
- Selenium and sulfur uptakee0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selenium and sulfur uptake in plants positively correlated with selenium concentration in the nutrient solution.”
t0“Brassica oleracea”
Claim · model-written summary
Sulfur concentration with selenium equaled or exceeded concentration with elevated sulfur.
- Taxon
- Brassica oleraceaBrassica oleraceat0
- Treatment
- seleniume0
- Outcome
- sulfur concentratione0
- Direction
- equaled or exceedede0
- Comparator
- elevated sulfure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sulfur concentration of plants exposed to selenium equaled or exceeded the sulfur concentration of plants exposed to elevated sulfur.”
t0“Brassica oleracea”
Claim · model-written summary
Selenium enrichment significantly decreased production of five of seven analyzed glucosinolates.
- Taxon
- Brassica oleraceaBrassica oleraceat0
- Treatment
- selenium-enrichede0
- Outcome
- production of five of the seven glucosinolatese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“statistically significant decrease in production of five of the seven glucosinolates analyzed in selenium-enriched plants”
t0“Brassica oleracea”
Claim · model-written summary
Elevated sulfur treatments produced more glucosinolates than selenium treatment.
- Taxon
- Brassica oleraceaBrassica oleraceat0
- Treatment
- elevated sulfur treatmentse0
- Outcome
- glucosinolate productione0
- Direction
- highere0
- Comparator
- selenium-treated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants that underwent elevated sulfur treatments had higher glucosinolate production than selenium-treated plants.”
t0“Brassica oleracea”
Claim · model-written summary
The authors suggest selenium upregulates or prevents downregulation of sulfur uptake.
- Taxon
- Brassica oleraceaBrassica oleraceat0
- Treatment
- seleniume0
- Outcome
- sulfur uptakee0
- Direction
- upregulates or prevents the downregulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selenium either upregulates or prevents the downregulation of sulfur uptake in B. oleracea”
t0“Brassica oleracea”
Claim · model-written summary
The authors infer selenium within the plant negatively affects production of certain glucosinolates despite adequate sulfur.
- Taxon
- Brassica oleraceaBrassica oleraceat0
- Treatment
- seleniume0
- Outcome
- production of certain glucosinolatese0
- Direction
- negative impacte0
- Qualifier
- despite adequate availability of sulfure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the presence of selenium within the plant appears to have a negative impact on the production of certain glucosinolates despite adequate availability of sulfur”
t0“Brassica oleracea”
The same questions in other papers
sulfur atom · quality: phytochemicals · Brassica oleracea (wild cabbage)Positive and negative results
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- no effect
- no effect
- negative
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See all 11 papers →selenium atom · nutrient: content · Brassica oleracea (wild cabbage)Results agree
8 papers in the same direction as this paper
- positive
- positive
- positive
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See all 9 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.