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Salicylic acid modulates olive tree physiological and growth responses to drought and rewatering events in a dose dependent manner
- Source :
- Journal of Plant Physiology. 230:21-32
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The predicted accentuation of drought events highlights the importance of optimize plants capacity to tolerate drought, but also the capacity to recovery from it, especially in species, as olive tree (Olea europaea L.), that grows in particularly susceptible regions. Three different concentrations (10, 100 and 1000 μM) of salicylic acid (SA), a stress signaling phytohormone, was sprayed on 3-year-old potted olive trees subjected to three successive drought and rewatering events. Trees responses to SA application are concentration dependent, being 100 μM the most effective concentration to improve drought tolerance and recovery capacity. During drought events, this effectiveness was achieved by osmolytes accumulation, leaf water status maintenance, reduced photosynthetic systems drought-associated damages, and by optimizing shoot/root ratio. The better plant fitness during drought allowed a fast recovery of the physiological functions upon rewatering and reduced the necessity to invest in extra repair damages, allowing the regrowth. The intense abscisic acid (ABA) signal close to upper epidermis in stressed controls suggests a “memory” of the worst water status displayed by those plants. SA attenuated the limitation of total biomass accumulation imposed by drought, mainly in root system, increased water use efficiency and lead to a higher intense signal of indoleacetic acid (IAA) in leaves during recovery period. In summary, in a suitable concentration, SA demonstrate to be a promising tool to increase drought adaptability of olive trees.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Physiology
Drought tolerance
Plant Science
01 natural sciences
03 medical and health sciences
chemistry.chemical_compound
Plant Growth Regulators
Olea
Water-use efficiency
Abscisic acid
Dehydration
Dose-Response Relationship, Drug
biology
fungi
Water
food and beverages
biology.organism_classification
Olive trees
Plant Leaves
Horticulture
030104 developmental biology
chemistry
Osmolyte
Shoot
Salicylic Acid
Agronomy and Crop Science
Salicylic acid
010606 plant biology & botany
Subjects
Details
- ISSN :
- 01761617
- Volume :
- 230
- Database :
- OpenAIRE
- Journal :
- Journal of Plant Physiology
- Accession number :
- edsair.doi.dedup.....efd8abb82fe8842d9334896c25a76954
- Full Text :
- https://doi.org/10.1016/j.jplph.2018.08.004