Exploring the Role of Root Exudates in Enhancing Olive Tree Resilience to Drought

Climate change has been threatening the sustainability of Mediterranean olive orchards, particularly under rainfed conditions. Prolonged drought affects not only plant performance but also soil functions, disturbing processes such as nutrient cycling and microbial activity. Under stress conditions, plants have developed mechanisms that include the secretion of root exudates, a complex mixture of primary and secondary metabolites, which play a crucial role in modulating soil microbial communities and plant-soil interactions, to enhance resilience to stress.

Although emerging evidence suggests that drought conditions influence root exudation, the specific responses of olive trees and the underlying dynamics under drought conditions remain largely unexplored. This proposal aims to fill this gap by investigating the dynamic role of root exudates in the olive tree’s physiological and biochemical response to progressive and recurrent drought. Furthermore, this study seeks to explore if repeated drought conditions promote a stress memory response, enhancing their capacity to respond more efficiently to subsequent drought events.

The novelty of this proposal lies in its integrative approach to studying plant-soil interactions in olive trees under progressive drought, recovery, and re-exposure cycles. The expected outcomes include a deeper understanding of olive tree adaptive responses, the identification of key root exudate metabolites associated with drought resilience, and new insights into how these compounds influence soil properties and plant performance. It is also expected to understand if olive trees exhibit a memory response in root exudation, enabling a more efficient adaptation to subsequent drought episodes.

These findings will support the development of practical strategies to enhance the sustainability and climate resilience of Mediterranean olive orchards.