Abstract
Abstract Drought stress alters the chemical composition of plants, which can influence their tolerance to insect herbivory. To evaluate plant chemical responses to drought stress, broccoli, Brassica oleracea L. var. italica Plenck (Brassicaceae), was grown under well‐watered, drought, and water‐logged conditions. The glucosinolate (GS) levels and the performance of two aphid species, the specialist Brevicoryne brassicae (L.) and the generalist Myzus persicae (Sulzer) (both Hemiptera: Aphididae), in relation to water stress conditions were studied. High Performance Liquid Chromatography analysis showed that water stress changed the levels of GS in broccoli plants. Plants grown for 2 weeks under drought stress were significantly smaller and showed decreased levels of total GS when compared with GS contents of well‐watered plants, whereas water‐logged conditions led to a slight increase in the GS contents. A substantial decrease in indolyl GS was detected in water‐deficient plants, whereas aliphatic GS decreased slightly. Analysis of sugar levels in phloem sap of broccoli plants revealed that plants under water‐logged conditions contained the highest amounts of sugars followed by drought‐stressed and well‐watered plants. The two aphid species responded differently to water stress‐induced changes in their host plants. Significantly larger populations of M. persicae were recorded on plants with a limited water supply than on plants grown under well‐watered or water‐logged conditions. Brevicoryne brassicae was less affected by water stress, and similar population sizes were found on plants that were subject to different treatments. Analysis of covariance showed a significant effect of the plants’ water condition but no significant effect of GS content on the performance of M. persicae . However, the specialist B. brassicae remained unaffected by changes induced under water stress conditions.
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Claims 11
Claim · model-written summary
Water stress changed broccoli glucosinolate levels.
- Taxon
- broccoli
Brassica oleracea var. italicae0 - Treatment
- water stresse0
- Outcome
- levels of GSe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stress changed the levels of GS in broccoli plants”
Claim · model-written summary
Drought reduced broccoli plant size versus well-watered plants.
- Taxon
- broccoliBrassica oleracea var. italicae1
- Treatment
- drought stresse0
- Outcome
- smallere0
- Direction
- smallere0
- Comparator
- well‐watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown for 2 weeks under drought stress were significantly smaller and showed decreased levels of total GS when compared with GS contents of well‐watered plants”
e1“broccoli plants. Plants grown for 2 weeks under drought stress”
Claim · model-written summary
Drought decreased total glucosinolates versus well-watered plants.
- Taxon
- broccoliBrassica oleracea var. italicae1
- Treatment
- drought stresse0
- Outcome
- levels of total GSe0
- Direction
- decreasede0
- Comparator
- well‐watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown for 2 weeks under drought stress were significantly smaller and showed decreased levels of total GS when compared with GS contents of well‐watered plants”
e1“broccoli plants. Plants grown for 2 weeks under drought stress”
Claim · model-written summary
Waterlogging slightly increased glucosinolate content.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- water‐logged conditionse0
- Outcome
- GS contentse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water‐logged conditions led to a slight increase in the GS contents”
e1“water‐logged conditions led to a slight increase in the GS contents”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Water deficiency substantially decreased indolyl glucosinolates.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- water‐deficiente0
- Outcome
- indolyl GSe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A substantial decrease in indolyl GS was detected in water‐deficient plants”
e1“A substantial decrease in indolyl GS was detected in water‐deficient plants”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Water deficiency slightly decreased aliphatic glucosinolates.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- water‐deficiente1
- Outcome
- aliphatic GSe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aliphatic GS decreased slightly”
e1“A substantial decrease in indolyl GS was detected in water‐deficient plants, whereas aliphatic GS decreased slightly.”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Broccoli phloem sugar levels were highest under waterlogging, then drought, then well-watered conditions.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Organ / stage
- phloem sape1
- Treatment
- water‐logged conditionse0
- Outcome
- amounts of sugarse0
- Direction
- higheste0
- Comparator
- drought‐stressed and well‐watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants under water‐logged conditions contained the highest amounts of sugars followed by drought‐stressed and well‐watered plants”
e1“Analysis of sugar levels in phloem sap of broccoli plants revealed that plants under water‐logged conditions contained the highest amounts of sugars followed by drought‐stressed and well‐watered plants.”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Myzus persicae populations were significantly larger under limited water supply than well-watered or waterlogged conditions.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- limited water supplye0
- Interactor
- M. persicae
Myzus persicaee0pest - Outcome
- populations of M. persicaee0
- Direction
- largere0
- Comparator
- well‐watered or water‐logged conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significantly larger populations of M. persicae were recorded on plants with a limited water supply than on plants grown under well‐watered or water‐logged conditions.”
e1“Significantly larger populations of M. persicae were recorded on plants with a limited water supply than on plants grown under well‐watered or water‐logged conditions.”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Brevicoryne brassicae populations were similar across water treatments.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- water stresse0
- Interactor
- Brevicoryne brassicae
.jpg?width=60)
Brevicoryne brassicaee0pest - Outcome
- population sizese0
- Direction
- similare0
- Comparator
- different treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Brevicoryne brassicae was less affected by water stress, and similar population sizes were found on plants that were subject to different treatments.”
e1“Brevicoryne brassicae was less affected by water stress, and similar population sizes were found on plants that were subject to different treatments.”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Plant water condition significantly affected Myzus persicae performance.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- plants’ water conditione0
- Interactor
- M. persicaeMyzus persicaee0pest
- Outcome
- performance of M. persicaee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant effect of the plants’ water condition but no significant effect of GS content on the performance of M. persicae”
e1“a significant effect of the plants’ water condition but no significant effect of GS content on the performance of M. persicae”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
Claim · model-written summary
Glucosinolate content had no significant effect on Myzus persicae performance.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Interactor
- M. persicaeMyzus persicaee0pest
- Compound
- GSe0
- Outcome
- performance of M. persicaee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant effect of GS content on the performance of M. persicae”
e1“no significant effect of GS content on the performance of M. persicae”
t0“broccoli, Brassica oleracea L. var. italica Plenck”
The same questions in other papers
drought · Brevicoryne brassicae · Brassica oleracea (wild cabbage)Positive and negative results
1 reporting no difference from an alternative
- positive
drought · quality: phytochemicals · Brassica oleracea (wild cabbage)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- positive
3 papers more in this group
See all 7 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.