Abstract
【Objective】This study was to explore the effect of interaction between internal ethylene and 1-methylcyclopropene on ripening physiology of tomato fruit during postharvest storage.【Method】Breaker(cv.Florida 47)tomato fruits as a model system were divided into 4 groups,2 groups of fruit were maintained under hypoxic hypobaric(HH,8kPa,1.7kPa O2)conditions for 6h,followed immediately by treatment with sub-saturating levels(50μg/L)of aqueous 1-MCP and di-water for 1min at 20℃,respectively.Another 2groups of fruits without prior to exposure to HH were treated 50μg/L 1-MCP and di-water for 1min at 20℃,respectively.After treatment,all fruits were stored at 20℃and the ripening related physiological indexes as well as changes in cell wall metabolism components were investigated during storage.【Result】Upon removal from HH conditions,ethylene synthesis and internal ethylene concentration(IEC) were reduced 75.6%in breaker tomato fruits.Compared to control fruit and fruit receiving 50μg/L aqueous 1-MCP without prior exposure to HH conditions,fruits subjected to HH conditions showed significantly enhanced 1-MCP efficacy on suppressing softening,in which the firmness in fruit treated with 1-MCP following HH was 29.8% and 15.6% higher that that in control and 1-MCP-treated fruit during 4-16d of storage;The respiration and ethylene peak in fruit treated with 1-MCP following HH was delayed by 4and 2d,respectively,compared with that in control and 1-MCP-treated fruits,but no significant difference was found in climacteric maxima of respiration and ethylene production;The treatment with 1-MCP after HH also more evidently affected the activity trends of cell wall enzymes including polygalacturonase(PG),pectinmethylesterase(PME),α-galactosidase(α-Gal)andβ-galactosidase(β-Gal)activity,typically on PG activity.Consistent with the trend of PG activity,water/CDTA-soluble uronic acid(UA)content was strongly suppressed by treatment of 50μg/L 1-MCP following HH,in which water-soluble and CDTA-soluble content UA in fruits treated with 1-MCP following HH were 37.3% and 31.4%lower than that in control,21.9% and 20.5% lower than that in 1-MCP-treated fruits during 6-12d of storage,respectively;Polyuronides in fruits treated with 1-MCP following HH exhibited slower molecular mass downshifts compared with the control and 1-MCP-treated fruits.In addition,all results in this study showed that there were no significant differences between control and HH treatment.【Conclusion】The results of this study offer further evidence that internal ethylene levels play a significant role in 1-MCP responsiveness and may explain the variable sensitivity of different climacteric fruits and cultivars to 1-MCP applied at and beyond the initiation of ripening.
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Claims 14
Claim · model-written summary
Hypoxic hypobaric exposure reduced ethylene synthesis and internal ethylene concentration in breaker tomato fruit by 75.6%.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- breaker tomato fruitse0
- Treatment
- hypoxic hypobaric(HH,8kPa,1.7kPa O2)conditions for 6he1
- Outcome
- ethylene synthesis and internal ethylene concentration(IEC)e0
- Direction
- reducede0
- Value
- 75.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upon removal from HH conditions,ethylene synthesis and internal ethylene concentration(IEC) were reduced 75.6%in breaker tomato fruits”
e1“hypoxic hypobaric(HH,8kPa,1.7kPa O2)conditions for 6h”
Claim · model-written summary
After HH and 1-MCP treatment, tomato fruit firmness was 29.8% higher than controls during 4-16 days of storage.
Verbatim
e0“fruits subjected to HH conditions showed significantly enhanced 1-MCP efficacy on suppressing softening,in which the firmness in fruit treated with 1-MCP following HH was 29.8% and 15.6% higher that that in control and 1-MCP-treated fruit during 4-16d of storage”
Claim · model-written summary
After HH and 1-MCP treatment, tomato fruit firmness was 15.6% higher than in fruit treated with 1-MCP alone during 4-16 days of storage.
Verbatim
e0“the firmness in fruit treated with 1-MCP following HH was 29.8% and 15.6% higher that that in control and 1-MCP-treated fruit during 4-16d of storage”
Claim · model-written summary
HH followed by 1-MCP delayed the respiration peak by four days relative to control and 1-MCP-only fruit.
Verbatim
e0“The respiration and ethylene peak in fruit treated with 1-MCP following HH was delayed by 4and 2d,respectively,compared with that in control and 1-MCP-treated fruits”
Claim · model-written summary
HH followed by 1-MCP delayed the ethylene peak by two days relative to control and 1-MCP-only fruit.
Verbatim
e0“The respiration and ethylene peak in fruit treated with 1-MCP following HH was delayed by 4and 2d,respectively,compared with that in control and 1-MCP-treated fruits”
Claim · model-written summary
Climacteric maxima of respiration and ethylene production did not differ significantly among treatments.
Verbatim
e0“no significant difference was found in climacteric maxima of respiration and ethylene production”
e1“fruit treated with 1-MCP following HH was delayed by 4and 2d,respectively,compared with that in control and 1-MCP-treated fruits”
Claim · model-written summary
HH followed by 1-MCP changed the activity trends of four cell wall enzymes, particularly PG.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 1-MCP after HHe0
- Gene
- polygalacturonase(PG)e0
- Outcome
- activity trends of cell wall enzymese0
- Direction
- affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment with 1-MCP after HH also more evidently affected the activity trends of cell wall enzymes including polygalacturonase(PG),pectinmethylesterase(PME),α-galactosidase(α-Gal)andβ-galactosidase(β-Gal)activity,typically on PG activity”
t0“tomato fruit”
Claim · model-written summary
HH followed by 1-MCP suppressed water-soluble uronic acid content by 37.3% relative to control during days 6-12.
Verbatim
e0“water-soluble and CDTA-soluble content UA in fruits treated with 1-MCP following HH were 37.3% and 31.4%lower than that in control,21.9% and 20.5% lower than that in 1-MCP-treated fruits during 6-12d of storage”
Claim · model-written summary
HH followed by 1-MCP suppressed CDTA-soluble uronic acid content by 31.4% relative to control during days 6-12.
Verbatim
e0“water-soluble and CDTA-soluble content UA in fruits treated with 1-MCP following HH were 37.3% and 31.4%lower than that in control,21.9% and 20.5% lower than that in 1-MCP-treated fruits during 6-12d of storage”
Claim · model-written summary
HH followed by 1-MCP lowered water-soluble uronic acid content by 21.9% relative to 1-MCP alone during days 6-12.
Verbatim
e0“water-soluble and CDTA-soluble content UA in fruits treated with 1-MCP following HH were 37.3% and 31.4%lower than that in control,21.9% and 20.5% lower than that in 1-MCP-treated fruits during 6-12d of storage”
Claim · model-written summary
HH followed by 1-MCP lowered CDTA-soluble uronic acid content by 20.5% relative to 1-MCP alone during days 6-12.
Verbatim
e0“water-soluble and CDTA-soluble content UA in fruits treated with 1-MCP following HH were 37.3% and 31.4%lower than that in control,21.9% and 20.5% lower than that in 1-MCP-treated fruits during 6-12d of storage”
Claim · model-written summary
Polyuronides in fruit given HH followed by 1-MCP showed slower molecular mass downshifts than in control and 1-MCP-only fruit.
Verbatim
e0“Polyuronides in fruits treated with 1-MCP following HH exhibited slower molecular mass downshifts compared with the control and 1-MCP-treated fruits”
Claim · model-written summary
HH treatment alone did not differ significantly from control in the measured tomato fruit results.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- HH treatmente0
- Outcome
- no significant differencese0
- Direction
- no significant differencese0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no significant differences between control and HH treatment”
t0“tomato fruit”
Claim · model-written summary
The authors infer that internal ethylene levels affect responsiveness to 1-MCP.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- 1-MCP responsivenesse0
- Qualifier
- internal ethylene levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“internal ethylene levels play a significant role in 1-MCP responsiveness”
t0“tomato fruit”
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- no effect
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See all 23 papers →1-methylcyclopropene · quality: postharvest · Solanum lycopersicum (tomato)Results agree
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See all 53 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.