Abstract
In this article, the effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated. Three-week-old plants were exposed to DS by receiving only so much water every evening to ensure 30% field capacity water content overnight. After three days under these conditions, we observed that DS induced a decline of the CO2 assimilation. Gas-exchange data showed that the closure of stomata during DS did not lead to a concomitant decline in calculated intercellular CO2 concentration. Moreover, DS plants showed a reduction of the photochemical Chl fluorescence quenching, photosystem II quantum yield and electron transport rate and a higher pH gradient and more heat dissipation as compared to controls. The activity of Calvin cycle enzymes, Rubisco, sFBPase, and Ru5PK, decreased strongly in DS plants as compared to controls. Data analysis suggest that the decrease of CO2 assimilation under drought conditions is not related to a diminished capacity of the use of NADPH and ATP but probably to the decline of enzyme activity involved in RuBP regeneration (Ru5PK).
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Claims 6
Claim · model-written summary
Drought stress reduced CO2 assimilation in Phaseolus vulgaris.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Treatment
- drought stress (DS)e0
- Outcome
- CO2 assimilatione1
- Direction
- declinee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated”
e1“After three days under these conditions, we observed that DS induced a decline of the CO2 assimilation”
Claim · model-written summary
Closure of stomata under drought did not lead to a decline in calculated intercellular CO2 concentration in Phaseolus vulgaris.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- DSe2
- Outcome
- calculated intercellular CO2 concentratione2
- Direction
- declinee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated”
e2“Gas-exchange data showed that the closure of stomata during DS did not lead to a concomitant decline in calculated intercellular CO2 concentration”
Claim · model-written summary
Drought-stressed plants had reduced photochemical Chl fluorescence quenching, photosystem II quantum yield and electron transport rate compared with controls.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- DSe3
- Outcome
- photochemical Chl fluorescence quenching, photosystem II quantum yield and electron transport ratee3
- Direction
- reductione3
- Comparator
- controlse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated”
e3“DS plants showed a reduction of the photochemical Chl fluorescence quenching, photosystem II quantum yield and electron transport rate and a higher pH gradient and more heat dissipation as compared to controls”
Claim · model-written summary
Drought-stressed plants had a higher pH gradient and more heat dissipation compared with controls.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- DSe3
- Outcome
- pH gradient and more heat dissipatione3
- Direction
- highere3
- Comparator
- controlse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated”
e3“DS plants showed a reduction of the photochemical Chl fluorescence quenching, photosystem II quantum yield and electron transport rate and a higher pH gradient and more heat dissipation as compared to controls”
Claim · model-written summary
Drought-stressed plants had strongly decreased activity of Rubisco, sFBPase and Ru5PK compared with controls.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- DSe4
- Gene
- Rubisco, sFBPase, and Ru5PKe4
- Outcome
- activity of Calvin cycle enzymese4
- Direction
- decreased stronglye4
- Comparator
- controlse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated”
e4“The activity of Calvin cycle enzymes, Rubisco, sFBPase, and Ru5PK, decreased strongly in DS plants as compared to controls”
Claim · model-written summary
The authors suggest the drop in CO2 assimilation under drought is probably due to decreased activity of the RuBP-regeneration enzyme Ru5PK rather than limited NADPH and ATP use.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Gene
- Ru5PKe5
- Outcome
- decrease of CO2 assimilatione5
- Qualifier
- probablye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of drought stress (DS) on gas exchange, chlorophyll (Chl) a fluorescence and Calvin cycle enzymes in Phaseolus vulgaris are evaluated”
e5“Data analysis suggest that the decrease of CO2 assimilation under drought conditions is not related to a diminished capacity of the use of NADPH and ATP but probably to the decline of enzyme activity involved in RuBP regeneration (Ru5PK)”
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