Genotypic variation of physiological and morphological traits of seven olive cultivars under sustained and cyclic drought in Mendoza, Argentina

Trentacoste, Eduardo R.; Contreras-Zanessi, Octavio; Beyá-Marshall, V.; Puertas, Carlos M.

doi:10.1016/j.agwat.2017.10.018

Cited by 14 publications

(12 citation statements)

References 44 publications

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“…Significant reductions in RWC, Ψ w , gs, E, TCC and Fv/Fm and increases in ProC and SSC were observed after subjecting young olive plants to water deficit. These findings are consistent with results of other studies that confirmed the changes caused by water stress in a number of physiological and biochemical parameters that regulate drought tolerance and growth in plants [7,15,[30][31][32][33][34]. Ben Ahmed et al [32] reported a reduction in RWC, Ψ w , gs and E of 32% and 51%, 43% and 48% respectively, in "Chemlali", "Meski" and "Picholine" olive varieties under water deficit treatment.…”

Section: Discussionsupporting

confidence: 91%

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Physiological and biochemical responses of young olive trees (Olea europaea L.) to water stress during flowering

Yamani

Sakar

Boussakouran

et al. 2019

Arch biol sci (Beogr)

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This study examines physiological and biochemical changes in three Moroccan varieties of young olive trees (Olea europaea L.) grown under three different water regimes (control, moderate stress and severe stress). Leaf relative water content (RWC), water potential (Ψw), transpiration rate (E), stomatal conductance (gs), maximum quantum efficiency of PSII (Fv/Fm), the contents of total chlorophyll (TCC), proline (ProC) and soluble sugars (SSC) were measured at the flowering stage during three growing seasons (2015, 2016 and 2017). ANOVA analyses showed that the effect of the water regime was predominant in all of the examined parameters, except for Fv/Fm, which was under the effect of both water regime and growing season. Impacts of variety and interactions were of lesser magnitude. Water deficit reduced E, Ψw and gs by 25%, while its effect on RWC and Fv/Fm was a decrease of about 7%; however, increases in SSC and ProC were more than 10%. Among the growing seasons, 2015 flowering displayed the lowest values for RWC, Ψw, E, gs, TCC and Fv/Fm, and the highest for ProC and SSC. Among plant varieties, no significant differences were observed. The three principal component (PC) axes accounted for 91% of total variance. PC1 was better explained by the water regime, while the growing season fitted PC3 variability. Correlation studies highlighted significant associations between most parameters. Positive relationships were found between RWC, Ψw, E, gs, Fv/Fm and TCC, while all of these parameters were negatively linked to ProC and SSC.

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Section: Discussionsupporting

confidence: 91%

“…The effectiveness of water use in response to limited resources is often assessed by the water status, gas exchange and some biochemical changes. Several studies have been conducted on young trees growing in pots to assess their behavior in stressed environments [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Physiological and biochemical responses of young olive trees (Olea europaea L.) to water stress during flowering

Yamani

Sakar

Boussakouran

et al. 2019

Arch biol sci (Beogr)

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“…( United Nations, 2015 ). Promising approaches for ensuring the stability of food production under limited water availability involve breeding practices that take advantage of the genetic variability of wild related species and different cultivars that have better adapted to environmental constraints ( Nevo et al, 2012 ; Burnett et al, 2016 ), such as water-deficit conditions ( Ruane et al, 2008 ; Reddy et al, 2017 ; Trentacoste et al, 2018 ). Crop breeders seek to identify and select traits or mechanisms that enable high biological or reproductive yields to be achieved under water-limited conditions ( Turner, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Traits Emerge as Relevant Determinants of Growth Patterns in Wild Olive Genotypes Under Water Stress

et al. 2019

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The hydraulic traits of plants, or the efficiency of water transport throughout the plant hydraulic system, could help to anticipate the impact of climate change and improve crop productivity. However, the mechanisms explaining the role of hydraulic traits on plant photosynthesis and thus, plant growth and yield, are just beginning to emerge. We conducted an experiment to identify differences in growth patterns at leaf, root and whole plant level among four wild olive genotypes and to determine whether hydraulic traits may help to explain such differences through their effect on photosynthesis. We estimated the relative growth rate (RGR), and its components, leaf gas exchange and hydraulic traits both at the leaf and whole-plant level in the olive genotypes over a full year. Photosynthetic capacity parameters were also measured. We observed different responses to water stress in the RGRs of the genotypes studied being best explained by changes in the net CO2 assimilation rate (NAR). Further, net photosynthesis, closely related to NAR, was mainly determined by hydraulic traits, both at leaf and whole-plant levels. This was mediated through the effects of hydraulic traits on stomatal conductance. We observed a decrease in leaf area: sapwood area and leaf area: root area ratios in water-stressed plants, which was more evident in the olive genotype Olea europaea subsp. guanchica (GUA8), whose RGR was less affected by water deficit than the other olive genotypes. In addition, at the leaf level, GUA8 water-stressed plants presented a better photosynthetic capacity due to a higher mesophyll conductance to CO2 and a higher foliar N. We conclude that hydraulic allometry adjustments of whole plant and leaf physiological response were well coordinated, buffering the water stress experienced by GUA8 plants. In turn, this explained their higher relative growth rates compared to the rest of the genotypes under water-stress conditions.

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“…Changes in leaf water status are closely coordinated with stomatal closure to reduce plant water loss through transpiration [96]. Thus, as soon as plants subjected to drought or salinity conditions perceived water, they progressively increase their leaf Ψ [97,98] and gs [5,38,99,100]. In agreement with this, we observed that olive plants subjected to drought for 20 days were able to increase both gs (Figure 8) and Ψ (Table 3) after applying water (control) or new doses of bacterial suspensions, irrespective of the bacterial treatment.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Indigenous Olive Biocontrol Rhizobacteria as Protectants against Drought and Salt Stress

et al. 2021

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Stress caused by drought and salinity may compromise growth and productivity of olive (Olea europaea L.) tree crops. Several studies have reported the use of beneficial rhizobacteria to alleviate symptoms produced by these stresses, which is attributed in some cases to the activity of 1-aminocyclopropane-1-carboxylic acid deaminase (ACD). A collection of beneficial olive rhizobacteria was in vitro screened for ACD activity. Pseudomonas sp. PICF6 displayed this phenotype and sequencing of its genome confirmed the presence of an acdS gene. In contrast, the well-known root endophyte and biocontrol agent Pseudomonas simiae PICF7 was defective in ACD activity, even though the presence of an ACD-coding gene was earlier predicted in its genome. In this study, an unidentified deaminase was confirmed instead. Greenhouse experiments with olive ‘Picual’ plants inoculated either with PICF6 or PICF7, or co-inoculated with both strains, and subjected to drought or salt stress were carried out. Several physiological and biochemical parameters increased in stressed plants (i.e., stomatal conductance and flavonoids content), regardless of whether or not they were previously bacterized. Results showed that neither PICF6 (ACD positive) nor PICF7 (ACD negative) lessened the negative effects caused by the abiotic stresses tested, at least under our experimental conditions.

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Genotypic variation of physiological and morphological traits of seven olive cultivars under sustained and cyclic drought in Mendoza, Argentina

Cited by 14 publications

References 44 publications

Physiological and biochemical responses of young olive trees (Olea europaea L.) to water stress during flowering

Physiological and biochemical responses of young olive trees (Olea europaea L.) to water stress during flowering

Hydraulic Traits Emerge as Relevant Determinants of Growth Patterns in Wild Olive Genotypes Under Water Stress

Evaluation of Indigenous Olive Biocontrol Rhizobacteria as Protectants against Drought and Salt Stress

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