Abstract
Abstract. Silver ions effectively inhibited both the initiation and the continuation of tomato ( Lyeopersicon esculentum Mill) ripening. Studies of protein synthesis in vivo showed that application of 2 mol m −3 silver thiosulphate to mature green fruit prevented the appearance of several novel proteins associated with ripening, including the softening enzyme polygalacturonase. However, total protein synthesis, as judged by the incorporation of [ 35 S] methionine into proteins, continued unabated after silver treatment. Ripening was also arrested when silver was supplied after ripening had begun. The accumulation of several ripening‐related mRNAs, including that for polygalacturonase, was studied by translation in vitro and using cDNA clones as hybridization probes. Silver was shown to prevent the appearance of polygalaturonase mRNA when supplied to mature green fruit and to cause a rapid reduction in the concentration of mRNA for polygalacturonase and other ripening‐related proteins when supplied after ripening had begun. It is proposed that silver exerts its effects due to interaction with the ethylene perception mechanism. The results suggest that perception of ethylene is vital not only for the initiation of ripening but also for the continued expression of genes required for ripening.
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Claims 7
Claim · model-written summary
Silver ions inhibited initiation and continuation of tomato ripening.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- Silver ionse0
- Outcome
- ripeninge0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“Silver ions effectively inhibited both the initiation and the continuation of tomato ( Lyeopersicon esculentum Mill) ripening”
Claim · model-written summary
Silver thiosulphate prevented appearance of ripening-associated proteins, including polygalacturonase.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- mature green fruite0
- Treatment
- 2 mol m −3 silver thiosulphatee0
- Gene
- polygalacturonasee0
- Outcome
- appearance of several novel proteins associated with ripeninge0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“application of 2 mol m −3 silver thiosulphate to mature green fruit prevented the appearance of several novel proteins associated with ripening, including the softening enzyme polygalacturonase”
Claim · model-written summary
Total protein synthesis continued after silver treatment.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- silver treatmente0
- Outcome
- total protein synthesise0
- Direction
- continued unabatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“total protein synthesis, as judged by the incorporation of [ 35 S] methionine into proteins, continued unabated after silver treatment”
Claim · model-written summary
Silver supplied after ripening began arrested tomato ripening.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- silvere0
- Outcome
- Ripeninge0
- Direction
- arrestede0
- Qualifier
- after ripening had begune0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“Ripening was also arrested when silver was supplied after ripening had begun”
Claim · model-written summary
Silver prevented polygalacturonase mRNA appearance in mature green fruit.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- mature green fruite0
- Treatment
- Silvere0
- Gene
- polygalaturonasee0
- Outcome
- appearance of polygalaturonase mRNAe0
- Direction
- prevente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“Silver was shown to prevent the appearance of polygalaturonase mRNA when supplied to mature green fruit”
Claim · model-written summary
Silver reduced concentrations of mRNA for polygalacturonase and other ripening proteins after ripening began.
- Taxon
- tomatoSolanum lycopersicumt0
- Gene
- polygalacturonasee0
- Outcome
- concentration of mRNA for polygalacturonase and other ripening‐related proteinse0
- Direction
- reductione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“cause a rapid reduction in the concentration of mRNA for polygalacturonase and other ripening‐related proteins when supplied after ripening had begun”
Claim · model-written summary
Authors propose that silver acts through the ethylene perception mechanism.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- silvere0
- Outcome
- effectse0
- Qualifier
- interaction with the ethylene perception mechanisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e0“It is proposed that silver exerts its effects due to interaction with the ethylene perception mechanism”
The same questions in other papers
silver ion · quality: postharvest · Solanum lycopersicum (tomato)Positive and negative results
1 in the opposite direction
- positive
silver atom · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
2 in the opposite direction
- positive
- positive
silver atom · quality: postharvest · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 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.