Abstract
On the 6th day after girdling, the photosynthesis rate of leaves on the 3-year-old stem, 2-year-old stem and new shoot of a branch of a field-grown 4-year-old apple tree decreased. The starch content in the leaves, bark and wood significantly increased, especially in shoot leaves. In the girdled branch, concomitant with the photosynthesis reduction, on the 6th day after girdling, the stomatal conductance of leaves on the 3-year-old stem, 2-year-old stem and new shoot declined. Under this condition, a significant correlation between the photosynthesis rate and stomatal conductance could be recognized. On the other hand, with girdling, the activity of ribulose-1,5-bisphosphate carboxylase (RuBPcase) per leaf area decreased on the basis of the decrease in RuBPcase activity per unit enzyme protein. The initial activity of RuBPcase per leaf area in shoot leaves decreased. Moreover, the activity of RuBPcase per leaf area significantly correlated with the photosynthesis rate. Based on these results, it is suggested that the decrease in the photosynthesis rate of the sink-limited branch of a young apple tree 6 days after girdling is mainly caused by closing of the stomatal aperture and reduction of RuBPcase activity per leaf area.
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Claims 8
Claim · model-written summary
Leaf photosynthesis fell six days after girdling across stem ages and shoots.
- Taxon
- apple tree
Malus domesticae0 - Treatment
- girdlinge0
- Outcome
- photosynthesis rate of leavese0
- Direction
- decreasede0
- Qualifier
- 6th day after girdlinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On the 6th day after girdling, the photosynthesis rate of leaves on the 3-year-old stem, 2-year-old stem and new shoot of a branch of a field-grown 4-year-old apple tree decreased”
Claim · model-written summary
Starch content in leaves, bark and wood increased significantly after girdling, especially in shoot leaves.
- Taxon
- appleMalus domesticat0
- Treatment
- girdlingt0
- Outcome
- starch content in the leaves, bark and woode0
- Direction
- increasede0
- Qualifier
- especially in shoot leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The starch content in the leaves, bark and wood significantly increased, especially in shoot leaves”
t0“Apple Leaf under Sink-limited Conditions Due to Girdling”
Claim · model-written summary
Stomatal conductance fell on older stems and new shoots six days after girdling.
- Taxon
- appleMalus domesticat0
- Treatment
- girdlinge0
- Outcome
- stomatal conductance of leavese0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the 6th day after girdling, the stomatal conductance of leaves on the 3-year-old stem, 2-year-old stem and new shoot declined”
t0“Apple Leaf under Sink-limited Conditions Due to Girdling”
Claim · model-written summary
Photosynthesis rate and stomatal conductance correlated significantly after girdling.
- Taxon
- appleMalus domesticat0
- Organ / stage
- Leaft0
- Outcome
- photosynthesis ratee0
- Qualifier
- stomatal conductancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant correlation between the photosynthesis rate and stomatal conductance could be recognized”
t0“Apple Leaf under Sink-limited Conditions Due to Girdling”
Claim · model-written summary
Girdling lowered RuBPcase activity per leaf area and activity per unit enzyme protein.
- Taxon
- appleMalus domesticat0
- Treatment
- girdlinge0
- Gene
- ribulose-1,5-bisphosphate carboxylase (RuBPcase)e0
- Outcome
- activity of ribulose-1,5-bisphosphate carboxylase (RuBPcase) per leaf areae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with girdling, the activity of ribulose-1,5-bisphosphate carboxylase (RuBPcase) per leaf area decreased on the basis of the decrease in RuBPcase activity per unit enzyme protein”
t0“Apple Leaf under Sink-limited Conditions Due to Girdling”
Claim · model-written summary
Initial RuBPcase activity per leaf area declined in shoot leaves.
- Taxon
- appleMalus domesticat0
- Organ / stage
- shoot leavese0
- Gene
- RuBPcasee0
- Outcome
- initial activity of RuBPcase per leaf areae0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The initial activity of RuBPcase per leaf area in shoot leaves decreased”
t0“Apple Leaf under Sink-limited Conditions Due to Girdling”
Claim · model-written summary
RuBPcase activity per leaf area correlated significantly with photosynthesis rate.
- Taxon
- appleMalus domesticat0
- Gene
- RuBPcasee0
- Outcome
- photosynthesis ratee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activity of RuBPcase per leaf area significantly correlated with the photosynthesis rate”
t0“Apple Leaf under Sink-limited Conditions Due to Girdling”
Claim · model-written summary
Authors attribute lower photosynthesis after girdling mainly to stomatal closure and reduced RuBPcase activity.
- Taxon
- apple treeMalus domesticae0
- Treatment
- girdlinge0
- Gene
- RuBPcasee0
- Outcome
- decrease in the photosynthesis ratee0
- Qualifier
- closing of the stomatal aperture and reduction of RuBPcase activity per leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease in the photosynthesis rate of the sink-limited branch of a young apple tree 6 days after girdling is mainly caused by closing of the stomatal aperture and reduction of RuBPcase activity per leaf area”
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