Abstract
Water stress usually impairs photosynthesis and plant growth. Acacia tortilis subsp. raddiana is well adapted to dry environments. The aim of the present study was to determine the impact of a progressive decrease in soil water content on photosynthetic-related parameters at the young seedling stage. Drought-induced plant responses occurred according to two types of kinetics. Water potential, stomatal conductance, and transpiration rates were rapidly affected by a decrease in soil water content, while chlorophyll fluorescence-related parameters and chlorophyll concentrations decreased only when soil water content was lower than 40%. The maximal efficiency of PSII photochemistry in the dark-adapted state remained unaffected by the treatment, whatever the stress duration. A. raddiana accumulated high concentrations of soluble sugars in relation to a stress-induced early stimulation of sucrose-phosphate synthase activity, while stimulation of invertase and sucrose synthase led to fructose accumulation only at the end of the stress period. We suggested that sugar accumulation may be involved in osmotic adjustment and protection of stressed tissues. A. raddiana was thus able to protect its photosynthetic machinery under drought conditions and may be considered as a promising species for revegetation of dry areas.
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Abbreviations
- Chl:
-
chlorophyll
- DM:
-
dry mass
- E :
-
instantaneous transpiration
- ED:
-
density of epidermal pavement cells
- ETR:
-
electron transfer rate
- F0 :
-
the minimal fluorescence in the dark-adapted state
- Fm :
-
the maximal fluorescence in the dark-adapted state
- FM:
-
fresh mass
- g s :
-
stomatal conductance
- LA:
-
leaf area
- NPQ:
-
nonphotochemical quenching
- P N :
-
net photosynthesis
- qP :
-
photochemical quenching
- RWC:
-
relative water content
- SD:
-
stomatal density
- SI:
-
stomatal index
- SLA:
-
specific leaf area
- SPS:
-
sucrose-phosphate-synthase
- SuSy:
-
sucrose synthase
- SWC:
-
soil water content
- WUE:
-
water-use efficiency
- ΨW :
-
shoot water potential
- ΨS :
-
shoot osmotic potential
- ΦPSII :
-
actual PSII efficiency
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Acknowledgements: This work was supported by Wallonie-Bruxelles International (Project de Coopération 2 — axe 4) and by the Fonds National de la Recherche Scientifique (No. 1.5117.11 and 1.5114.11). The authors are very grateful to Dr. Isabelle Lefèvre for valuable help in sugar analysis, to Béatrice Lambillotte, and Brigitte Van Pee for technical assistance, and to Université Catholique de Louvain (Secrétariat à la Cooperation) for the PhD grant of S. Kebbas. This manuscript is dedicated to the memory of Dr N.E. Noureddine (Université des Sciences et de la Technologie Houari Boumediene, Alger).
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Kebbas, S., Lutts, S. & Aid, F. Effect of drought stress on the photosynthesis of Acacia tortilis subsp. raddiana at the young seedling stage. Photosynthetica 53, 288–298 (2015). https://doi.org/10.1007/s11099-015-0113-6
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DOI: https://doi.org/10.1007/s11099-015-0113-6