Abstract
Mayoral, M. L., Plaut, Z. and Reinhold, L. 1985. Effect of sink-source manipulations on the photosynthetic rate and carbohydrate content of cucumber cotyledons.-J. exp. Bot. 36 1551–1558. The photosynthetic rate of cucumber cotyledons (Cucumis sativus cv. Dahla) reached a maximum value of 12 mg dm−2 h−1, 10 d after emergence. In 12-d-old seedlings removal of one cotyledon doubled the CO2 fixation rate of the other, as observed 3 d after treatment. When the primary leaf was removed, the photosynthetic rate of the cotyledons was decreased by 33%. At this stage of growth elimination of the roots as a sink for assimilates by girdling the hypocotyl affected neither the photosynthetic rate nor the carbohydrate content of the cotyledons. By contrast, in 18-d-old seedlings removal of the first leaf brought about a 42% increase in the photosynthetic rate of the cotyledons. The simultaneous removal of the first leaf and one cotyledon doubled the rate of CO2 fixation of the remaining cotyledon. Girdling the hypocotyl lowered the photosynthetic rate of the cotyledons by 73%. In both 12- and 18-d-old seedlings a decrease or increase in the sink-source ratio was correlated with an increase or a decrease respectively in the carbohydrate content of the cotyledons. The stomatal resistance of the cotyledons was not affected by any of the treatments. The effect of sink-source manipulations on photosynthesis and on the level of carbohydrates present in the cotyledons was more evident in those seedlings growing under high light intensity (580 μE m−2 s−1), than in those exposed to 300 μE m−2 s−1
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Claims 10
Claim · model-written summary
The photosynthetic rate of cucumber cotyledons reached a maximum of 12 mg dm−2 h−1, 10 d after emergence.
- Taxon
- cucumber
Cucumis sativuse0 - Material
- Dahlae0
- Organ / stage
- cotyledonse0
- Outcome
- photosynthetic ratee0
- Direction
- maximume0
- Value
- 12 mg dm−2 h−1e0
- Qualifier
- 10 d after emergencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic rate of cucumber cotyledons (Cucumis sativus cv. Dahla) reached a maximum value of 12 mg dm−2 h−1, 10 d after emergence”
Claim · model-written summary
In 12-d-old seedlings, removal of one cotyledon doubled the CO2 fixation rate of the other cotyledon 3 d after treatment.
- Taxon
- CucumberCucumis sativust0
- Treatment
- removal of one cotyledone0
- Outcome
- CO2 fixation ratee0
- Direction
- doublede0
- Qualifier
- 12-d-old seedlingse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“In 12-d-old seedlings removal of one cotyledon doubled the CO2 fixation rate of the other, as observed 3 d after treatment”
Claim · model-written summary
Removal of the primary leaf decreased the photosynthetic rate of the cotyledons by 33%.
- Taxon
- CucumberCucumis sativust0
- Treatment
- the primary leaf was removede0
- Outcome
- photosynthetic rate of the cotyledonse0
- Direction
- decreasede0
- Value
- 33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“When the primary leaf was removed, the photosynthetic rate of the cotyledons was decreased by 33%”
Claim · model-written summary
In 12-d-old seedlings, girdling the hypocotyl to eliminate the roots as a sink affected neither the photosynthetic rate nor the carbohydrate content of the cotyledons.
- Taxon
- CucumberCucumis sativust0
- Treatment
- girdling the hypocotyle0
- Outcome
- photosynthetic rate nor the carbohydrate contente0
- Direction
- affected neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“elimination of the roots as a sink for assimilates by girdling the hypocotyl affected neither the photosynthetic rate nor the carbohydrate content of the cotyledons”
Claim · model-written summary
In 18-d-old seedlings, removal of the first leaf increased the photosynthetic rate of the cotyledons by 42%.
- Taxon
- CucumberCucumis sativust0
- Treatment
- removal of the first leafe0
- Outcome
- photosynthetic rate of the cotyledonse0
- Direction
- increasee0
- Value
- 42%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“in 18-d-old seedlings removal of the first leaf brought about a 42% increase in the photosynthetic rate of the cotyledons”
Claim · model-written summary
Simultaneous removal of the first leaf and one cotyledon doubled the CO2 fixation rate of the remaining cotyledon.
- Taxon
- CucumberCucumis sativust0
- Treatment
- simultaneous removal of the first leaf and one cotyledone0
- Outcome
- rate of CO2 fixatione0
- Direction
- doublede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“The simultaneous removal of the first leaf and one cotyledon doubled the rate of CO2 fixation of the remaining cotyledon”
Claim · model-written summary
Girdling the hypocotyl lowered the photosynthetic rate of the cotyledons by 73%.
- Taxon
- CucumberCucumis sativust0
- Treatment
- Girdling the hypocotyle0
- Outcome
- photosynthetic rate of the cotyledonse0
- Direction
- lowerede0
- Value
- 73%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“Girdling the hypocotyl lowered the photosynthetic rate of the cotyledons by 73%”
Claim · model-written summary
In 12- and 18-d-old seedlings, a decrease or increase in the sink-source ratio was correlated with an increase or decrease, respectively, in cotyledon carbohydrate content.
- Taxon
- CucumberCucumis sativust0
- Treatment
- decrease or increase in the sink-source ratioe0
- Outcome
- carbohydrate content of the cotyledonse0
- Direction
- increase or a decrease respectivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“In both 12- and 18-d-old seedlings a decrease or increase in the sink-source ratio was correlated with an increase or a decrease respectively in the carbohydrate content of the cotyledons”
Claim · model-written summary
The stomatal resistance of the cotyledons was not affected by any of the treatments.
- Taxon
- CucumberCucumis sativust0
- Treatment
- any of the treatmentse0
- Outcome
- stomatal resistance of the cotyledonse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“The stomatal resistance of the cotyledons was not affected by any of the treatments”
Claim · model-written summary
The effects of sink-source manipulations on photosynthesis and carbohydrate level were more evident in seedlings under high light intensity (580 μE m−2 s−1) than under 300 μE m−2 s−1.
- Taxon
- CucumberCucumis sativust0
- Treatment
- sink-source manipulationse0
- Outcome
- photosynthesis and on the level of carbohydratese0
- Direction
- more evidente0
- Qualifier
- high light intensity (580 μE m−2 s−1)e0
- Comparator
- 300 μE m−2 s−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Cotyledons”
e0“The effect of sink-source manipulations on photosynthesis and on the level of carbohydrates present in the cotyledons was more evident in those seedlings growing under high light intensity (580 μE m−2 s−1), than in those exposed to 300 μE m−2 s−1”