The role of nighttime water balance on Olea europaea plants subjected to contrasting water regimes

Foliar Pre-Treatment with Abscisic Acid Enhances Olive Tree Drought Adaptability

“…In fact, none of the stressed treatments completely restored the g s in both RPs (Figure 2A). Nonetheless, following the typical olive tree response, water status recovered earlier than g s , as in other studies [9,52]. Similarly, ABA pre-treatment did not affect the RWC reestablishment (Figure 3), suggesting that the difference in the extent of damages registered during the drought events was not sufficient to disturb the capacity to uptake the newly available water.…”

“…This response is another important mechanism to tolerate repeated cycles of drought [76], although to be transversal to both D and D + ABA plants were more pronounced with ABA application. By optimizing shoot/root ratio, these plants maintained the equilibrium between water supply and demand and improved the partitioning of assimilates to recovery, after mobilization of stored reserves in roots [9]. Moreover, the stimulation of root development by ABA addition was previously described under drought conditions [19,44].…”

“…These changes are likely to be of real adaptive significance, with important implications for olive tree growth and productivity.Olive tree (Olea europaea L.) is a woody species which grows under the typical Mediterranean semi-arid conditions, a region already affected by multiple environmental constraints factors, and particularly susceptible to climate change, being expected higher temperatures and shifts in the precipitation patterns, leading to higher evaporative demand and lower soil water availability [4]. Although olive is a crop well-adapted to harsh conditions, water deficit has negative repercussions on water relations, carbon assimilation, oxidative pathways, nutrient uptake and biomass accumulation [1,[5][6][7][8][9][10]. Moreover, the adaptation mechanisms adopted by this species against drought stress are activated at the expense of carbon reserves and may be detrimental with the increased duration and intensity of stress.…”

Disturbance mechanism of coal mining subsidence to typical plants in a semiarid area using O-J-I-P chlorophyll a fluorescence analysis

“…4 shows that the leaf E and PN of three plants from NZ to CZ and SZ decreased in turn compared with those of the CK, and this change was closely related to the degree of opening of the leaf stomata. Part of the water absorbed by the plant roots is lost through leaf transpiration; E plays an important role in maintaining the balance of water in plants (Brito et al 2018). The results showed that to maintain normal physiological activities and reduce the loss of water in plants, L s increased and gs decreased, which led to the decrease of E in plant leaves, also indicating that the plants in the coal mining subsidence area were likely to suffer from drought stress.…”

Olive tree physiology and chemical composition of fruits are modulated by different deficit irrigation strategies

“…Due to the diverse microclimates, soils, and rainfall patterns in Mediterranean olive‐growing areas, the water needs of annual crops range extensively. Moreover, although olive trees are known to be resistant to drought, irrigation has been shown to improve the physiological performance of the trees, including better water status, higher stomatal conductance and photosynthetic rates, and the crop yield . Nonetheless, irrigation has also been shown to have negative effects on both oil yield and quality, as the percentage of oil in the fruit has been reported to decrease as a function of increased amounts of water applied, affecting both the total amount of phenolic compounds and the high‐performance liquid chromatography (HPLC) profiles present in virgin olive oils, changing the olive oil stability to autoxidation, the sensory quality, and ultimately consumer acceptance …”