Abstract
To clarify the role of ethylene in systemic acquired resistance (SAR), we conducted experiments using Arabidopsis ethylene response mutants. Plants that are nonresponsive to ethylene (i.e., [theta]tr1 and [theta]in2) showed normal sensitivity to the SAR-inducing chemicals salicylic acid (SA) and 2,6-dichloroisonicotinic acid with respect to SAR gene induction and pathogen resistance. This indicated that chemically induced SAR is not an ethylene-dependent process in Arabidopsis. Ethephon, an ethylene-releasing chemical, induced SAR gene expression in both the wild type and ethylene mutants, whereas ethylene alone did not, suggesting that induction of these genes by ethephon is not due to the action of ethylene. Furthermore, transgenic plants expressing salicylate hydroxylase, a bacterial enzyme that degrades SA to catechol, did not accumulate SAR mRNAs in response to ethephon. Thus, SAR gene induction by ethephon appears to be mediated through SA. Other experiments suggested that ethylene may play a role in SAR by enhancing tissue sensitivity to the action of SA.
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Claims 6
Claim · model-written summary
Ethylene-nonresponsive mutants retained normal sensitivity to SAR-inducing chemicals for gene induction and pathogen resistance.
- Taxon
- Arabidopsis
Arabidopsist0 - Material
- [theta]tr1 and [theta]in2e0
- Outcome
- SAR gene induction and pathogen resistancee0
- Direction
- normal sensitivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants that are nonresponsive to ethylene (i.e., [theta]tr1 and [theta]in2) showed normal sensitivity to the SAR-inducing chemicals salicylic acid (SA) and 2,6-dichloroisonicotinic acid with respect to SAR gene induction and pathogen resistance”
t0“Arabidopsis”
Claim · model-written summary
Ethephon induced SAR gene expression in wild type and ethylene mutants.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Ethephone0
- Outcome
- SAR gene expressione0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon, an ethylene-releasing chemical, induced SAR gene expression in both the wild type and ethylene mutants”
t0“Arabidopsis”
Claim · model-written summary
Ethylene alone did not induce SAR gene expression.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- ethylene alonee0
- Outcome
- SAR gene expressione1
- Direction
- did note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas ethylene alone did not”
e1“induced SAR gene expression in both the wild type and ethylene mutants”
t0“Arabidopsis”
Claim · model-written summary
Salicylate-hydroxylase transgenic plants failed to accumulate SAR mRNAs after ethephon.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- ethephone0
- Gene
- salicylate hydroxylasee0
- Outcome
- SAR mRNAse0
- Direction
- did not accumulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transgenic plants expressing salicylate hydroxylase, a bacterial enzyme that degrades SA to catechol, did not accumulate SAR mRNAs in response to ethephon”
t0“Arabidopsis”
Claim · model-written summary
The authors infer ethephon-induced SAR gene expression is mediated by salicylic acid.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- ethephone0
- Compound
- SAe0
- Outcome
- SAR gene inductione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SAR gene induction by ethephon appears to be mediated through SA”
t0“Arabidopsis”
Claim · model-written summary
The authors suggest ethylene can enhance tissue sensitivity to salicylic acid in SAR.
- Taxon
- ArabidopsisArabidopsist0
- Compound
- SAe0
- Outcome
- tissue sensitivity to the action of SAe0
- Direction
- enhancinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethylene may play a role in SAR by enhancing tissue sensitivity to the action of SA”
t0“Arabidopsis”
The same questions in other papers
ethene · disease · ArabidopsisPositive and negative results
5 papers in the same direction as this paper · 5 in the opposite direction
- negative
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See all 11 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.