Abstract
The phytohormone jasmonic acid (JA) plays a core role in plant defence against herbivores. When attacked by herbivores, JA and its bioactive derivatives are accumulated at the damage site, and subsequently perceived by the jasmonate co-receptors COI1 and JAZ proteins. The (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile) is known to be the main active JA derivative controlling vascular plant responses to herbivores as well as other JA-regulated processes. However, whether other endogenous JA-amino acid conjugates (JA-AAs) are involved in herbivore-induced defence responses remain unknown. Here, we investigated the role of herbivore-elicited JA-AAs in the crop plant rice. The levels of five JA-AAs were significantly increased under the armyworm, leaf folder and brown planthopper attack. Of the elicited JA derivatives, JA-Ile, JA-Val and JA-Leu could serve as ligands to promote the interaction between rice COI1 and JAZs, inducing OsJAZ4 degradation in vivo. JA-Val or JA-Leu treatment increased the expression of JA- and defence-related pathway genes but not JA-Ile levels, suggesting that these JA-AAs may directly function in JA signalling. Furthermore, the application of JA-Val or JA-Leu resulted in JA-mediated plant growth inhibition, while enhancing plant resistance to herbivore attack. This study uncovers that JA-Val and JA-Leu also play a role in rice defence against herbivores.
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Claims 6
Claim · model-written summary
Five JA-AA levels rose significantly under armyworm, leaf folder and brown planthopper attack.
- Taxon
- rice
Oryza sativae1 - Interactor
- armyworme0herbivore
- Outcome
- levels of five JA-AAse0
- Direction
- increasede0
- Value
- five JA-AAse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of five JA-AAs were significantly increased under the armyworm, leaf folder and brown planthopper attack.”
e1“crop plant rice”
Claim · model-written summary
JA-Ile, JA-Val and JA-Leu promoted COI1-JAZ interactions and OsJAZ4 degradation.
- Taxon
- riceOryza sativae0
- Gene
- OsJAZ4e0
- Compound
- JA-Ile, JA-Val and JA-Leue0
- Outcome
- OsJAZ4 degradatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JA-Ile, JA-Val and JA-Leu could serve as ligands to promote the interaction between rice COI1 and JAZs, inducing OsJAZ4 degradation in vivo”
Claim · model-written summary
JA-Val or JA-Leu increased defence gene expression.
- Taxon
- riceOryza sativae1
- Treatment
- JA-Val or JA-Leu treatmente0
- Outcome
- expression of JA- and defence-related pathway genese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JA-Val or JA-Leu treatment increased the expression of JA- and defence-related pathway genes”
e1“crop plant rice”
Claim · model-written summary
JA-Val or JA-Leu did not increase JA-Ile levels.
- Taxon
- riceOryza sativae1
- Treatment
- JA-Val or JA-Leu treatmente0
- Outcome
- JA-Ile levelse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“JA-Val or JA-Leu treatment increased the expression of JA- and defence-related pathway genes but not JA-Ile levels”
e1“crop plant rice”
Claim · model-written summary
JA-Val or JA-Leu inhibited plant growth.
- Taxon
- riceOryza sativae1
- Treatment
- application of JA-Val or JA-Leue0
- Outcome
- plant growth inhibitione0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of JA-Val or JA-Leu resulted in JA-mediated plant growth inhibition”
e1“crop plant rice”
Claim · model-written summary
JA-Val or JA-Leu enhanced resistance to herbivore attack.
- Taxon
- riceOryza sativae2
- Treatment
- application of JA-Val or JA-Leue1
- Interactor
- herbivoree0herbivore
- Outcome
- plant resistance to herbivore attacke0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while enhancing plant resistance to herbivore attack”
e1“the application of JA-Val or JA-Leu”
e2“crop plant rice”
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