Abstract
Abstract As the Earth's climate continues to change, drought and insect population outbreaks are predicted to increase in many parts of the world. It is therefore important to understand how changes in such abiotic and biotic stressors might impact agroecosystems. The plant stress hypothesis predicts that, owing to physiological and biochemical changes, plants experiencing drought will be more susceptible to insect herbivory, which could have synergistic negative effects on plant performance. By contrast, the plant vigor hypothesis predicts that insects will preferentially feed on fast‐growing vigorous plants. These hypotheses were tested in a field experiment using 16 soybean ( Glycine max ( L .) M err.) genotypes to determine: (i) the combined effects of drought and herbivory on plant performance; (ii) the impact of drought on soybean resistance to herbivores; and (iii) how genetically variable phenotypic traits in soybean correlate with these responses. It was found that drought had a greater effect on soybean performance than herbivory, and drought and herbivory did not interact to impact on any measure of plant performance. Drought caused decreased insect herbivory on average, suggesting that the plant vigor hypothesis is consistent with the effects of drought stress on soybean resistance to leaf‐chewing insect herbivores. This conclusion is further supported by genotypic correlations which show that plant growth rate is positively correlated with the amount of herbivory plants received. These results suggest that, although the effects of climate‐associated changes in drought and herbivory will have negative effects on soybean, these potential effects are quantifiable with simple experiments and can be mitigated through continued breeding of varieties that are tolerant and resistant to these abiotic and biotic stressors.
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Claims 4
Claim · model-written summary
Drought affected soybean performance more than herbivory.
- Taxon
- soybean
Glycine maxe0 - Outcome
- soybean performancee0
- Direction
- greatere0
- Comparator
- herbivorye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was found that drought had a greater effect on soybean performance than herbivory, and drought and herbivory did not interact to impact on any measure of plant performance.”
Claim · model-written summary
Drought and herbivory showed no interaction in their effects on soybean performance.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought and herbivorye0
- Outcome
- plant performancee0
- Direction
- did not interacte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was found that drought had a greater effect on soybean performance than herbivory, and drought and herbivory did not interact to impact on any measure of plant performance.”
Claim · model-written summary
Drought decreased insect herbivory on soybean on average.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Droughte0
- Interactor
- leaf‐chewing insect herbivorese0herbivore
- Outcome
- insect herbivorye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought caused decreased insect herbivory on average, suggesting that the plant vigor hypothesis is consistent with the effects of drought stress on soybean resistance to leaf‐chewing insect herbivores.”
t0“soybean”
Claim · model-written summary
Soybean growth rate was positively correlated with herbivory received.
- Taxon
- soybeanGlycine maxt0
- Outcome
- plant growth ratee0
- Direction
- positively correlatede0
- Comparator
- amount of herbivory plants receivede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This conclusion is further supported by genotypic correlations which show that plant growth rate is positively correlated with the amount of herbivory plants received.”
t0“soybean”
The same questions in other papers
drought · pest · Glycine max (soybean)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
4 papers more in this group
See all 8 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.