Abstract
In this work, the response of the halophytic shrub Prosopis strombulifera to lowering an osmotic potential (Ψo) to −1.0, −1.9, and −2.6 MPa generated by NaCl, Na2SO4, and the iso-osmotic combination of them was studied at 6, 12, and 24 h after reaching such values in the growing media. By analyzing the content of abscisic acid (ABA) and related metabolites and transpiration rates, we observed that ABA content varied depending on type of salt, salt concentration, organ analyzed, and age of a plant. ABA content in leaves was much higher than in roots, presumably because of rapid biosynthesis and transport from roots. Leaves of Na2SO4-treated plants had the highest ABA content at Ψo −2.6 MPa (24 h) associated with sulfate toxicity symptoms. Significant content of ABA-glucose ester (ABA-GE) was found in both the roots and leaves, whereas only low content of phaseic acid (PA) and dihydrophaseic acid (DPA). The roots showed high ABA-GE accumulation in all treatments. The highest content of free ABA was correlated with ABA-GE glucosidase activity. The results show that ABA-GE and free ABA work together to create a specific stress signal.
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Abbreviations
- ABA:
-
abscisic acid
- ABA-GE:
-
abscisic acid glucose ester
- DPA:
-
dihydrophaseic acid
- PA:
-
phaseic acid
- Ψo :
-
osmotic potential
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Acknowledgements: This study was supported with funds from CONICET PIP No 5628, PICTO-ANPCYT-UNRC No 30093, ICGBE-TWAS Joint Biotechnology Programme, and SECYT — Universidad Nacional de Río Cuarto and Ministerio de Ciencia y Tecnología de la Provincia de Córdoba (R No 1210/2007), Argentina, to V.L. We thank Dr. Steve Anderson for editing English text.
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Llanes, A., Masciarelli, O., Ordóñez, R. et al. Differential growth responses to sodium salts involve different abscisic acid metabolism and transport in Prosopis strombulifera . Biol Plant 58, 80–88 (2014). https://doi.org/10.1007/s10535-013-0365-6
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DOI: https://doi.org/10.1007/s10535-013-0365-6