Abstract
We tested the sulfur-modulated plant resistance hypothesis using potted cabbage (Brassica oleracea var. capitata) plants that were grown without and with increasing levels of sulfur fertilization. Changes in plant chemical traits were assessed and developmental performance of Plutella xylostella, a highly host-specific leaf-chewing insect, was followed. Leaf sulfur concentration gradually increased with growing addition of sulfur in soil; however, there was a generalized saturation response curve, with a plateau phase, for improvements in total leaf nitrogen, defense glucosinolates and insect performance. Plutella xylostella performed better in sulfur-fertilized cabbage probably because of the higher level of nitrogen, despite of the higher content of glucosinolates, which are toxic for many non-specialized insects. Despite the importance of sulfur in plant nutrition and production, especially for Brassica crops, our results showed that sulfur fertilization could decrease plant resistance against insects with high feeding specialization.
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Claims 5
Claim · model-written summary
Leaf sulfur concentration increased with soil sulfur addition.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Organ / stage
- Leafe1
- Treatment
- sulfure1
- Outcome
- Leaf sulfur concentratione1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage (Brassica oleracea var. capitata)”
e1“Leaf sulfur concentration gradually increased with growing addition of sulfur in soil”
Claim · model-written summary
Total leaf nitrogen rose with sulfur fertilization then plateaued.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- sulfure2
- Outcome
- total leaf nitrogene1
- Direction
- improvementse1
- Qualifier
- plateau phasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage (Brassica oleracea var. capitata)”
e1“a generalized saturation response curve, with a plateau phase, for improvements in total leaf nitrogen, defense glucosinolates and insect performance”
e2“Leaf sulfur concentration gradually increased with growing addition of sulfur in soil”
Claim · model-written summary
Defense glucosinolates rose with sulfur fertilization then plateaued.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- sulfure2
- Outcome
- defense glucosinolatese1
- Direction
- improvementse1
- Qualifier
- plateau phasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage (Brassica oleracea var. capitata)”
e1“a generalized saturation response curve, with a plateau phase, for improvements in total leaf nitrogen, defense glucosinolates and insect performance”
e2“Leaf sulfur concentration gradually increased with growing addition of sulfur in soil”
Claim · model-written summary
Plutella xylostella performed better on sulfur-fertilized cabbage.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- sulfur-fertilizede0
- Interactor
- Plutella xylostella
Plutella xylostellae0pest - Outcome
- Plutella xylostella performede0
- Direction
- bettere0
- Qualifier
- probably because of the higher level of nitrogene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plutella xylostella performed better in sulfur-fertilized cabbage probably because of the higher level of nitrogen, despite of the higher content of glucosinolates”
Claim · model-written summary
Sulfur fertilization could reduce resistance to specialized insects.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- sulfur fertilizatione1
- Outcome
- plant resistance against insectse1
- Direction
- decreasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage (Brassica oleracea var. capitata)”
e1“sulfur fertilization could decrease plant resistance against insects with high feeding specialization”
The same questions in other papers
sulfur atom · disease · Brassica oleracea (wild cabbage)Positive and negative results
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- no effect
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sulfur atom · nutrient: content · Brassica oleracea (wild cabbage)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- 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.