Abstract
The signaling pathways that enable plants to mount defenses against insect herbivores are known to be complex. It was previously demonstrated that the insect-resistant maize (Zea mays L.) genotype Mp708 accumulates a unique defense cysteine proteinase, Mirl-CP, in response to caterpillar feeding. In this study, the role of ethylene in insect defense in Mp708 and an insect-susceptible line Tx601 was explored. Ethylene synthesis was blocked with either cobalt chloride or aminoethoxyvinylglycine. Alternatively, ethylene perception was inhibited with 1-methylcyclopropene. Blocking ethylene synthesis and perception resulted in Mp708 plants that were more susceptible to caterpillar feeding. In addition, fall armyworm (Spodoptera frugiperda) larvae that fed on inhibitor-treated Mp708 plants had signifycantly higher growth rates than those reared on untreated plants. In contrast, these responses were not significantly altered in Tx601. The ethylene synthesis and perception inhibitors also reduced the accumulation of Mirl-CP and its transcript mir1 in response to herbivory. These results indicate that ethylene is a component of the signal transduction pathway leading to defense against insect herbivory in the resistant genotype Mp708.
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Claims 6
Claim · model-written summary
Blocking ethylene synthesis or perception increased Mp708 maize susceptibility to caterpillar feeding.
- Material
- Mp708e0
- Treatment
- Blocking ethylene synthesis and perceptione0
- Interactor
- caterpillare0herbivore
- Outcome
- susceptible to caterpillar feedinge0
- Direction
- more susceptiblee0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Blocking ethylene synthesis and perception resulted in Mp708 plants that were more susceptible to caterpillar feeding.”
t0“Maize”
Claim · model-written summary
Fall armyworm larvae feeding on inhibitor-treated Mp708 maize grew faster than larvae on untreated plants.
- Material
- Mp708e0
- Treatment
- inhibitor-treatede0
- Interactor
- Spodoptera frugiperda
.jpg?width=60)
Spodoptera frugiperdae0herbivore - Outcome
- growth ratese0
- Direction
- highere0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“fall armyworm (Spodoptera frugiperda) larvae that fed on inhibitor-treated Mp708 plants had signifycantly higher growth rates than those reared on untreated plants.”
t0“Maize”
Claim · model-written summary
Ethylene inhibitors did not significantly alter these caterpillar responses in Tx601 maize.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In contrast, these responses were not significantly altered in Tx601.”
t0“Maize”
Claim · model-written summary
Ethylene synthesis and perception inhibitors reduced herbivory-induced Mirl-CP accumulation in maize.
- Treatment
- ethylene synthesis and perception inhibitorse0
- Gene
- Mirl-CPe0
- Outcome
- accumulation of Mirl-CPe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ethylene synthesis and perception inhibitors also reduced the accumulation of Mirl-CP and its transcript mir1 in response to herbivory.”
t0“Maize”
Claim · model-written summary
Ethylene synthesis and perception inhibitors reduced herbivory-induced mir1 transcript accumulation in maize.
- Treatment
- ethylene synthesis and perception inhibitorse0
- Gene
- mir1e0
- Outcome
- transcript mir1e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ethylene synthesis and perception inhibitors also reduced the accumulation of Mirl-CP and its transcript mir1 in response to herbivory.”
t0“Maize”
Claim · model-written summary
Ethylene was inferred to participate in the defense signaling pathway of resistant Mp708 maize against insect herbivory.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results indicate that ethylene is a component of the signal transduction pathway leading to defense against insect herbivory in the resistant genotype Mp708.”
t0“Maize”
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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.