Abstract
Ethylene can only induce senescence in leaves that have reached a defined age. Thus, ethylene-induced senescence depends on age-related changes (ARCs) of individual leaves. The relationship between ethylene and age in the induction of leaf senescence was tested in Arabidopsis Ler-0, Col-0, and Ws-0 accessions as well as in eight old (onset of leaf death) mutants, isolated from the Ler-0 background. Plants with a constant final age of 24 d were exposed to ethylene for 3-16 d. The wild-type accessions showed a common response to the ethylene treatment. Increasing ethylene treatments of 3-12 d caused an increase in the number of yellow leaves. However, an ethylene exposure time of 16 d resulted in a decrease in the amount of yellowing. Thus, ethylene can both positively and negatively influence ARCs and the subsequent induction of leaf senescence, depending on the length of the treatment. The old mutants showed altered responses to the ethylene treatments. old1 and old11 were hypersensitive to ethylene in the triple response assay and a 12-d ethylene exposure resulted in a decrease in the amount of yellow leaves. The other six mutants did not show a decrease in yellow leaves with an ethylene treatment of 16 d. The results revealed that the effect of ethylene on the induction of senescence can be modified by at least eight genes.
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Claims 7
Claim · model-written summary
Wild-type accessions shared a response to ethylene.
- Taxon
- Arabidopsis
Arabidopsise1 - Material
- wild-type accessionse0
- Treatment
- ethylene treatmente0
- Outcome
- common responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wild-type accessions showed a common response to the ethylene treatment.”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
Claim · model-written summary
Ethylene exposure for 3 to 12 days increased yellow leaf count.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- ethylene treatments of 3-12 de0
- Outcome
- number of yellow leavese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing ethylene treatments of 3-12 d caused an increase in the number of yellow leaves.”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
Claim · model-written summary
Sixteen days of ethylene exposure decreased yellowing.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- ethylene exposure time of 16 de0
- Outcome
- amount of yellowinge0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an ethylene exposure time of 16 d resulted in a decrease in the amount of yellowing.”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
Claim · model-written summary
old1 and old11 mutants were hypersensitive to ethylene in the triple response assay.
- Taxon
- ArabidopsisArabidopsise1
- Material
- old1 and old11e0
- Gene
- old1 and old11e0
- Outcome
- hypersensitive to ethylenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“old1 and old11 were hypersensitive to ethylene in the triple response assay”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
Claim · model-written summary
Twelve days of ethylene exposure decreased yellow leaves in old1 and old11.
- Taxon
- ArabidopsisArabidopsise1
- Material
- old1 and old11e0
- Treatment
- 12-d ethylene exposuree0
- Outcome
- amount of yellow leavese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“old1 and old11 were hypersensitive to ethylene in the triple response assay and a 12-d ethylene exposure resulted in a decrease in the amount of yellow leaves.”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
Claim · model-written summary
The other six mutants did not show decreased yellow leaves after sixteen days of ethylene.
- Taxon
- ArabidopsisArabidopsise1
- Material
- other six mutantse0
- Treatment
- ethylene treatment of 16 de0
- Outcome
- yellow leavese0
- Direction
- did not show a decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The other six mutants did not show a decrease in yellow leaves with an ethylene treatment of 16 d.”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
Claim · model-written summary
At least eight genes can modify ethylene induction of senescence.
- Taxon
- ArabidopsisArabidopsise1
- Gene
- eight genese0
- Outcome
- induction of senescencee0
- Value
- at least eighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of ethylene on the induction of senescence can be modified by at least eight genes.”
e1“Arabidopsis Ler-0, Col-0, and Ws-0 accessions”
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