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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Abbreviations
- Chl:
-
chlorophyll
- DS:
-
drought stress(ed)
- ETR:
-
electron transport rate
- Fm :
-
maximum fluorescence in the darkadapted state
- Fm′:
-
fluorescence during the saturating pulse in the steady state
- Fm″:
-
(hypothetical) maximum fluorescence in the steady state
- Fo′:
-
minimum fluorescence after switch off the actinic light
- Fv :
-
maximal variable fluorescence
- Ft :
-
variable fluorescence in the stady state
- PPFD:
-
photosynthetic photon flux density
- PS:
-
photosystem
- qP :
-
photochemical quenching
- Rubisco:
-
ribulose-1,5-bisphosphate carboxylase/oxygenase
- RuBP:
-
ribulose-1,5-bisphosphate
- Ru5PK:
-
ribulose-5-phosphate kinase
- sFBPase:
-
stromal fructose-1,6-bisphosphatase
- qE :
-
fast relaxing non-photochemical quenching
- qI :
-
slowly relaxing nonphotochemical quenching
- WUEi :
-
intrinsic water use efficiency
- ΦPSII :
-
quantum yield of PSII
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Dias, M.C., Brüggemann, W. Limitations of photosynthesis in Phaseolus vulgaris under drought stress: gas exchange, chlorophyll fluorescence and Calvin cycle enzymes. Photosynthetica 48, 96–102 (2010). https://doi.org/10.1007/s11099-010-0013-8
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DOI: https://doi.org/10.1007/s11099-010-0013-8