Abstract
Glucosinolates are a class of nitrogen (N) and sulfur (S) containing compounds shown to have cancer-preventing properties in animal models and widely found in cruciferous plants. The overall objective of this study was to determine whether N and S fertility affects glucosinolate concentrations in cabbage ( Brassica oleracea L. Capitata group). Field studies on a sandy soil low in available N and S were conducted over a 2-year period with both green (`Grand Slam') and red (`Vorox') cabbage cultivars. Treatments evaluated each year were the interactive effects of N (125 and 250 kg·ha –1 ) and S (0, and 110 kg·ha –1 ) fertilizer application. Yield of both cabbage cultivars increased with increasing N and S in the second year of the study, but not in the first. Tissue N concentrations in heads at harvest increased with N application and tissue S concentrations increased with S application. When S was not applied, tissue S decreased significantly as N rate increased, while N rate had no effect on tissue S concentrations when S was applied. The dominant glucosinolate detected in both cabbage cultivars was glucobrassicin, with indole forms accounting for about 80% of the total glucosinolates regardless of treatment. Tissue N was negatively correlated and tissue S and S to N ratio were positively correlated with total glucosinolate concentration, although all correlations were generally weak ( r 2 < 0.5). Total glucosinolates and glucobrassicin concentrations were maximized in both cultivars at the low N and high S application rates. Except for sinigrin in one of the 2 years, all glucosinolates detected were higher in Vorox than in `Grand Slam'. Based on these results, glucosinolates in cabbage can be manipulated by cultural management practices as well as genetics.
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Claims 15
Claim · model-written summary
Green Grand Slam cabbage yield increased with N and S in year two, but not year one.
- Taxon
- cabbage
Brassica oleracea var. capitatae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of both cabbage cultivars increased with increasing N and S in the second year of the study, but not in the first.”
e1“green (`Grand Slam') and red (`Vorox') cabbage cultivars”
Claim · model-written summary
Red Vorox cabbage yield increased with N and S in year two, but not year one.
- Taxon
- cabbageBrassica oleracea var. capitatae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of both cabbage cultivars increased with increasing N and S in the second year of the study, but not in the first.”
e1“green (`Grand Slam') and red (`Vorox') cabbage cultivars”
Claim · model-written summary
Head tissue N increased with N application.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue N concentrations in heads at harvest increased with N application”
t0“Cabbage”
Claim · model-written summary
Head tissue S increased with S application.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tissue S concentrations increased with S application.”
t0“Cabbage”
Claim · model-written summary
Without S fertilizer, tissue S decreased significantly as N rate rose.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When S was not applied, tissue S decreased significantly as N rate increased”
t0“Cabbage”
Claim · model-written summary
With S fertilizer, N rate had no effect on tissue S.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N rate had no effect on tissue S concentrations when S was applied.”
t0“Cabbage”
Claim · model-written summary
Glucobrassicin was the dominant glucosinolate in both cultivars.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dominant glucosinolate detected in both cabbage cultivars was glucobrassicin”
t0“Cabbage”
Claim · model-written summary
Indole forms made up about 80% of total glucosinolates regardless of treatment.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indole forms accounting for about 80% of the total glucosinolates regardless of treatment”
t0“Cabbage”
Claim · model-written summary
Tissue N was negatively correlated with total glucosinolate concentration.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue N was negatively correlated and tissue S and S to N ratio were positively correlated with total glucosinolate concentration, although all correlations were generally weak ( r 2 < 0.5).”
t0“Cabbage”
Claim · model-written summary
Tissue S was positively correlated with total glucosinolate concentration.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue N was negatively correlated and tissue S and S to N ratio were positively correlated with total glucosinolate concentration, although all correlations were generally weak ( r 2 < 0.5).”
t0“Cabbage”
Claim · model-written summary
S to N ratio was positively correlated with total glucosinolate concentration.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue N was negatively correlated and tissue S and S to N ratio were positively correlated with total glucosinolate concentration, although all correlations were generally weak ( r 2 < 0.5).”
t0“Cabbage”
Claim · model-written summary
Low N and high S maximized total glucosinolates in both cultivars.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total glucosinolates and glucobrassicin concentrations were maximized in both cultivars at the low N and high S application rates.”
t0“Cabbage”
Claim · model-written summary
Low N and high S maximized glucobrassicin in both cultivars.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total glucosinolates and glucobrassicin concentrations were maximized in both cultivars at the low N and high S application rates.”
t0“Cabbage”
Claim · model-written summary
Glucosinolates other than sinigrin were higher in Vorox than Grand Slam.
- Taxon
- CabbageBrassica oleracea var. capitatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for sinigrin in one of the 2 years, all glucosinolates detected were higher in Vorox than in `Grand Slam'.”
t0“Cabbage”
Claim · model-written summary
The authors concluded cultural practice and genetics can manipulate cabbage glucosinolates.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Outcome
- glucosinolates in cabbage can be manipulated by cultural management practices as well as geneticse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glucosinolates in cabbage can be manipulated by cultural management practices as well as genetics.”
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