Abstract
Water stress induced an increase in endogenous concentrations of ABA in Lavandula stoechas L. plants to 13100 pmol ABA g−1 FW, which may contribute to the maintenance of water relations between the second and the third day of water stress treatment. After the third day, a sharp decrease in ABA levels was observed to 2630 pmol ABA g−1 FW, together with a decrease in water content and water potential and a loss of plant response to water stress. Water deficit did not induce an increase in endogenous ABA concentration, which remained at 514 pmol ABA g−1 FW in Rosmarinus officinalis L., which is more sclerophyllous than L. stoechas. Nevertheless, the relative water content of Rosmarinus officinalis L. after seven days of water stress decreased more than 40% and ψ reached values of −3.2 MPa. R. officinalis showed lower levels of ABA, but significantly higher levels of IAA and ZR than L. stoechas (4 times and 6 times respectively in well watered-plants). The increase in ABA levels is not a common mechanism in these two Mediterranean shrubs which survive under water stress conditions.
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Abbreviations
- ABA:
-
abscisic acid
- d:
-
days of water stress treatment
- DW:
-
dry weight
- FW:
-
fresh weight
- IAA:
-
indole-3-acetic acid
- RP:
-
Reversed Phase
- RWC:
-
relative water content
- TW:
-
turgid weight
- WC:
-
water content
- ZR:
-
zeatin riboside
- ψ:
-
water potential
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Lopez-Carbonell, M., Alegre, L., Pastor, A. et al. Variations in abscisic acid, indole-3-acetic acid and zeatin riboside concentrations in two Mediterranean shrubs subjected to water stress. Plant Growth Regul 20, 271–277 (1996). https://doi.org/10.1007/BF00043318
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DOI: https://doi.org/10.1007/BF00043318