Abstract
Soluble sugar content and activities of the sucrose-metabolizing enzymes sucrose synthase (SS) (EC 2.4.1.13), sucrose-phosphate synthase (SPS) (EC 2.4.1.14), and acid invertase (EC 2.4.1.26) were analyzed in the pericarp of fruit from pear cultivars that differed in their potential to accumulate sucrose to identify key enzymes involved in sucrose accumulation in Asian pears. The Japanese pear `Chojuro' [Pyrus pyrifolia (Burro. f.) Nakai] was characterized as a high-sucrose-accumulating type based on the analysis of mature fruit, while the Chinese pear `Yali' (P. bretschneideri Rehd.) was a low-sucrose-accumulating type throughout all developmental stages. The activity of SS and SPS in `Chojuro' increased during maturation concomitant with sucrose accumulation, whereas the activity of these enzymes in `Yali' did not increase during maturation. The activity of SS and SPS in the former were seven and four times, respectively, higher than those in the latter at the mature stage. Further, among 23 pear cultivars, SS activity was closely correlated with sucrose content, while SPS activity was weakly correlated. Soluble acid invertase activity in `Chojuro' and `Yali' decreased with fruit maturation, but the relationships between soluble invertase activity and sucrose content were not significant. The results indicate that SS and SPS are important determinants of sucrose accumulation in Asian pear fruit and that a decrease of soluble acid invertase activity is not absolutely required for sucrose accumulation.
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Claims 10
Claim · model-written summary
In Chojuro, SS and SPS activity increased during fruit maturation together with sucrose accumulation.
- Taxon
- Asian pear
_Pyrus_pyrifolia_flowers.jpg?width=60)
Pyrus pyrifoliat0 - Material
- `Chojuro'e1
- Outcome
- activity of SS and SPSe1
- Direction
- increasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Pyrus_pyrifolia_flowers.jpg?width=500)
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e1“The activity of SS and SPS in `Chojuro' increased during maturation concomitant with sucrose accumulation”
Claim · model-written summary
In Yali, SS and SPS activity did not increase during maturation.
- Taxon
- Asian pearPyrus pyrifoliat0
- Material
- `Yali'e2
- Outcome
- activity of these enzymese2
- Direction
- did not increasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e2“whereas the activity of these enzymes in `Yali' did not increase during maturation”
Claim · model-written summary
At the mature stage, SS activity in Chojuro was seven times higher than in Yali.
- Taxon
- Asian pearPyrus pyrifoliat0
- Material
- `Chojuro'e1
- Organ / stage
- mature stagee3
- Gene
- SSe3
- Outcome
- activity of SSe3
- Direction
- highere3
- Value
- sevene3
- Comparator
- `Yali' (P. bretschneideri Rehd.)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e1“The activity of SS and SPS in `Chojuro' increased during maturation concomitant with sucrose accumulation”
e3“The activity of SS and SPS in the former were seven and four times, respectively, higher than those in the latter at the mature stage”
e4“the Chinese pear `Yali' (P. bretschneideri Rehd.)”
Claim · model-written summary
At the mature stage, SPS activity in Chojuro was four times higher than in Yali.
- Taxon
- Asian pearPyrus pyrifoliat0
- Material
- `Chojuro'e1
- Organ / stage
- mature stagee3
- Gene
- SPSe3
- Outcome
- activity of SS and SPSe3
- Direction
- highere3
- Value
- foure3
- Comparator
- `Yali' (P. bretschneideri Rehd.)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e1“The activity of SS and SPS in `Chojuro' increased during maturation concomitant with sucrose accumulation”
e3“The activity of SS and SPS in the former were seven and four times, respectively, higher than those in the latter at the mature stage”
e4“the Chinese pear `Yali' (P. bretschneideri Rehd.)”
Claim · model-written summary
Among 23 pear cultivars, SS activity was closely correlated with sucrose content.
- Taxon
- Asian pearPyrus pyrifoliat0
- Gene
- SSe5
- Compound
- sucrosee5
- Outcome
- SS activitye5
- Qualifier
- closely correlatede5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e5“among 23 pear cultivars, SS activity was closely correlated with sucrose content, while SPS activity was weakly correlated”
Claim · model-written summary
Among 23 pear cultivars, SPS activity was weakly correlated with sucrose content.
- Taxon
- Asian pearPyrus pyrifoliat0
- Gene
- SPSe5
- Compound
- sucrosee5
- Outcome
- SPS activitye5
- Qualifier
- weakly correlatede5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e5“among 23 pear cultivars, SS activity was closely correlated with sucrose content, while SPS activity was weakly correlated”
Claim · model-written summary
Soluble acid invertase activity decreased with fruit maturation in Chojuro and Yali.
- Taxon
- Asian pearPyrus pyrifoliat0
- Material
- `Chojuro' and `Yali'e6
- Outcome
- Soluble acid invertase activitye6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e6“Soluble acid invertase activity in `Chojuro' and `Yali' decreased with fruit maturation”
Claim · model-written summary
The relationship between soluble invertase activity and sucrose content was not significant.
- Taxon
- Asian pearPyrus pyrifoliat0
- Gene
- soluble invertasee7
- Compound
- sucrosee7
- Outcome
- relationships between soluble invertase activity and sucrose contente7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e7“the relationships between soluble invertase activity and sucrose content were not significant”
Claim · model-written summary
SS and SPS are important determinants of sucrose accumulation in Asian pear fruit.
- Taxon
- Asian pearPyrus pyrifoliat0
- Gene
- SS and SPSe0
- Outcome
- sucrose accumulatione0
- Qualifier
- important determinantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e0“The results indicate that SS and SPS are important determinants of sucrose accumulation in Asian pear fruit”
Claim · model-written summary
A decrease in soluble acid invertase activity is not absolutely required for sucrose accumulation in Asian pear fruit.
- Taxon
- Asian pearPyrus pyrifoliat0
- Gene
- soluble acid invertasee0
- Outcome
- sucrose accumulatione0
- Qualifier
- is not absolutely requirede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sucrose Accumulation in Fruit of Asian Pear”
e0“a decrease of soluble acid invertase activity is not absolutely required for sucrose accumulation”