Abstract
This study investigates the effect of 2.5% O(2), both alone and in combination with ethylene, on respiration, sugar accumulation and activities of pectin methylesterase and acid phosphatase during ripening of bananas (Musa paradisiaca sapientum). In addition, the changes in the phosphatase isoenzyme profiles are also analyzed. Low oxygen diminished respiration and slowed down the accumulation of sugars and development of the yellow color. Furthermore, low O(2) prevented the rise in acid phosphatase activities and this suppression was not reversed by the inclusion of 100 microliters per liter ethylene in 2.5% O(2) atmosphere. Gel electrophoresis of both the soluble and particulate cell-free fractions under nondenaturing conditions revealed the presence of 8 and 9 isoenzymes in the soluble and particulate fractions, respectively. Low O(2) suppressed the appearance of all isoenzymes, and the addition of 500 microliters per liter ethylene to the low oxygen atmosphere did not reverse this effect. Similarly, the decline in pectin methylesterase that was observed in air-ripened fruits was prevented by 2.5% O(2) alone and in combination with 500 microliters per liter ethylene.
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Claims 9
Claim · model-written summary
Low oxygen diminished respiration in ripening bananas.
Not reportedComparator
Verbatim
e0“Low oxygen diminished respiration”
t0“Bananas”
Claim · model-written summary
Low oxygen slowed sugar accumulation and yellow color development.
- Taxon
- Bananast0
- Treatment
- Low oxygene0
- Outcome
- accumulation of sugars and development of the yellow colore0
- Direction
- slowed downe0
Not reportedComparator
Verbatim
e0“Low oxygen diminished respiration and slowed down the accumulation of sugars and development of the yellow color.”
t0“Bananas”
Claim · model-written summary
Low oxygen prevented the rise in acid phosphatase activities.
- Taxon
- Bananast0
- Treatment
- low O(2)e0
- Gene
- acid phosphatasee0
- Outcome
- acid phosphatase activitiese0
- Direction
- prevented the risee0
Not reportedComparator
Verbatim
e0“low O(2) prevented the rise in acid phosphatase activities”
t0“Bananas”
Claim · model-written summary
Adding ethylene did not reverse suppression of acid phosphatase activity in low oxygen.
- Taxon
- Bananast0
- Treatment
- 100 microliters per liter ethylene in 2.5% O(2) atmospheree0
- Outcome
- this suppressione0
- Direction
- not reversede0
Not reportedComparator
Verbatim
e0“this suppression was not reversed by the inclusion of 100 microliters per liter ethylene in 2.5% O(2) atmosphere”
t0“Bananas”
Claim · model-written summary
Soluble and particulate fractions contained eight and nine acid phosphatase isoenzymes, respectively.
Verbatim
e0“presence of 8 and 9 isoenzymes in the soluble and particulate fractions, respectively”
t0“Bananas”
Claim · model-written summary
Low oxygen suppressed the appearance of all acid phosphatase isoenzymes.
Not reportedComparator
Verbatim
e0“Low O(2) suppressed the appearance of all isoenzymes”
t0“Bananas”
Claim · model-written summary
Ethylene did not reverse low oxygen suppression of isoenzyme appearance.
- Taxon
- Bananast0
- Treatment
- 500 microliters per liter ethylene to the low oxygen atmospheree0
- Outcome
- this effecte0
- Direction
- did not reversee0
Not reportedComparator
Verbatim
e0“addition of 500 microliters per liter ethylene to the low oxygen atmosphere did not reverse this effect”
t0“Bananas”
Claim · model-written summary
Low oxygen prevented the decline in pectin methylesterase seen in air-ripened fruit.
Verbatim
e0“decline in pectin methylesterase that was observed in air-ripened fruits was prevented by 2.5% O(2) alone”
t0“Bananas”
Claim · model-written summary
Low oxygen with ethylene prevented the pectin methylesterase decline seen in air-ripened fruit.
Verbatim
e0“decline in pectin methylesterase that was observed in air-ripened fruits was prevented by 2.5% O(2) alone and in combination with 500 microliters per liter ethylene”
t0“Bananas”
The same questions in other papers
ethene · molecular: metabolites · MusaPositive and negative results
4 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
2 papers more in this group
See all 6 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.