Abstract
SUMMARY— Changes in firmness, protein, pectinesterase (PE) and polygalacturonase (PG) were followed during enlargement, maturation, and abnormal ripening of the Bartlett pear ( Pyrus communis ) on the tree. Although the PE activity per pear increased during maturation, with a good correlation with total weight ( r = 0.93 and 0.87 for 1962 and 1963), the amount of activity per gram fresh weight and per milligram protein decreased. There was a high correlation between PE activity and protein ( r = 0.84 and 0.91 for 1962 and 1963). The specific activity of the enzyme decreased during maturation. As the fruit matured and ripened on the tree, the percent recovery of PE decreased. The use of polyvinylpyrrolidone in the extraction procedure to adsorb the phenolic compounds counteracted this trend. It was concluded that the small changes in PE activity could not account for the changes in esterification of pectin observed by other investigators. Variable results were obtained with the PG assays. Weak PG activity was observed in the immature fruit in 1962 and 1963. No activity was observed in 1966, even in the presence of polyvinylpyrrolidone.
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Claims 13
Claim · model-written summary
PE activity per pear increased during maturation in Pyrus communis.
- Taxon
- Pyrus communis
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communist0 - Organ / stage
- maturatione0
- Outcome
- PE activity per peare0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
e0“Although the PE activity per pear increased during maturation, with a good correlation with total weight ( r = 0.93 and 0.87 for 1962 and 1963), the amount of activity per gram fresh weight and per milligram protein decreased”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
PE activity per pear was positively correlated with total weight in 1962 (r = 0.93) in Pyrus communis.
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PEe0
- Outcome
- PE activity per peare0
- Direction
- increaseinferrede0
- Value
- r = 0.93e0
- Qualifier
- for 1962e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the PE activity per pear increased during maturation, with a good correlation with total weight ( r = 0.93 and 0.87 for 1962 and 1963), the amount of activity per gram fresh weight and per milligram protein decreased”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
PE activity per pear was positively correlated with total weight in 1963 (r = 0.87) in Pyrus communis.
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PEe0
- Outcome
- PE activity per peare0
- Direction
- increaseinferrede0
- Value
- 0.87e0
- Qualifier
- 1963e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the PE activity per pear increased during maturation, with a good correlation with total weight ( r = 0.93 and 0.87 for 1962 and 1963), the amount of activity per gram fresh weight and per milligram protein decreased”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
PE activity in Pyrus communis was positively correlated with protein in 1962 (r = 0.84).
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PEe1
- Outcome
- PE activitye1
- Direction
- increaseinferrede1
- Value
- r = 0.84e1
- Qualifier
- for 1962e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There was a high correlation between PE activity and protein ( r = 0.84 and 0.91 for 1962 and 1963)”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
PE activity in Pyrus communis was positively correlated with protein in 1963 (r = 0.91).
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PEe1
- Outcome
- PE activitye1
- Direction
- increaseinferrede1
- Value
- 0.91e1
- Qualifier
- 1963e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There was a high correlation between PE activity and protein ( r = 0.84 and 0.91 for 1962 and 1963)”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
The amount of PE activity per gram fresh weight and per milligram protein in Pyrus communis decreased during maturation.
- Taxon
- Pyrus communisPyrus communist0
- Organ / stage
- maturatione0
- Outcome
- amount of activity per gram fresh weight and per milligram proteine0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the PE activity per pear increased during maturation, with a good correlation with total weight ( r = 0.93 and 0.87 for 1962 and 1963), the amount of activity per gram fresh weight and per milligram protein decreased”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
The specific activity of the enzyme in Pyrus communis decreased during maturation.
- Taxon
- Pyrus communisPyrus communist0
- Organ / stage
- maturatione2
- Outcome
- specific activity of the enzymee2
- Direction
- decreasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The specific activity of the enzyme decreased during maturation”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
The percent recovery of PE in Pyrus communis decreased as the fruit matured and ripened on the tree.
- Taxon
- Pyrus communisPyrus communist0
- Organ / stage
- matured and ripened on the treee3
- Outcome
- percent recovery of PEe3
- Direction
- decreasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“As the fruit matured and ripened on the tree, the percent recovery of PE decreased”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
Polyvinylpyrrolidone in the extraction procedure counteracted the decline in PE recovery on ripening.
- Taxon
- Pyrus communisPyrus communist0
- Treatment
- The use of polyvinylpyrrolidone in the extraction proceduree4
- Compound
- phenolic compoundse4
- Outcome
- this trende4
- Direction
- counteractede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The use of polyvinylpyrrolidone in the extraction procedure to adsorb the phenolic compounds counteracted this trend”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
Small changes in PE activity could not account for the changes in pectin esterification in Pyrus communis.
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PEe5
- Outcome
- changes in esterification of pectine5
- Qualifier
- small changese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“It was concluded that the small changes in PE activity could not account for the changes in esterification of pectin observed by other investigators”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
PG assays on Pyrus communis gave variable results.
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PGe6
- Outcome
- PG assayse6
- Qualifier
- Variable resultse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Variable results were obtained with the PG assays”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
Weak PG activity was observed in the immature fruit of Pyrus communis in 1962 and 1963.
- Taxon
- Pyrus communisPyrus communist0
- Organ / stage
- immature fruite7
- Gene
- PGe7
- Outcome
- PG activitye7
- Qualifier
- in 1962 and 1963e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Weak PG activity was observed in the immature fruit in 1962 and 1963. No activity was observed in 1966, even in the presence of polyvinylpyrrolidone”
t0“the Pear (Pyrus communis)”
Claim · model-written summary
No PG activity was observed in Pyrus communis in 1966, even in the presence of polyvinylpyrrolidone.
- Taxon
- Pyrus communisPyrus communist0
- Gene
- PGe6
- Outcome
- activitye7
- Qualifier
- in 1966, even in the presence of polyvinylpyrrolidonee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Weak PG activity was observed in the immature fruit in 1962 and 1963. No activity was observed in 1966, even in the presence of polyvinylpyrrolidone”
e6“Variable results were obtained with the PG assays”
t0“the Pear (Pyrus communis)”