Screening of Olive Biodiversity Defines Genotypes Potentially Resistant to Xylella fastidiosa

Pavan, Stefano; Vergine, Marzia; Nicolì, Francesca; Sabella, Erika; Aprile, Alessio; Negro, Carmine; Fanelli, Valentina; Savoia, Michele Antonio; Montilon, Vito; Susca, Leonardo; Delvento, Chiara; Lotti, Concetta; Nigro, Franco; Montemurro, Cinzia; Ricciardi, Luigi M.; Bellis, Luigi De; Luvisi, Andrea

doi:10.3389/fpls.2021.723879

Cited by 30 publications

(30 citation statements)

References 35 publications

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“…These symptoms are particularly severe on cv Cellina di Nardò plants, while a notable resistance was observed in the less common Leccino cultivar [ 11 , 12 , 13 , 14 , 15 ]. No cure is currently available, and according to several studies, the spread of Xf could cost billions of euros over the next years [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Xylella fastidiosa and Drought Stress in Olive Trees: A Complex Relationship Mediated by Soluble Sugars

Pascali

Vergine

Negro

et al. 2022

Biology

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Xylella fastidiosa (Xf) subsp. pauca “De Donno” is the etiological agent of “Olive Quick Decline Syndrome” (OQDS) on olive trees (Olea europaea L.); the presence of the bacterium causes xylem vessel occlusions inducing a drought stress and the development of leaf scorch symptoms, which may be worsened by water shortage in summer. In order to evaluate how the two stress factors overlap each other, the carbohydrate content and the expression patterns of genes related to carbohydrate metabolism have been evaluated in two olive cvs trees (Cellina di Nardò, susceptible to Xf, and Leccino, resistant to Xf) reporting transcriptional dynamics elicited by Xf infection, drought, or combined stress (drought/Xf). In the Xf-susceptible Cellina di Nardò plants, Xf and its combination with drought significantly decrease total sugars compared to control (−27.0% and −25.7%, respectively). In contrast, the Xf-resistant Leccino plants show a more limited reduction in sugar content in Xf-positive conditions (−20.1%) and combined stresses (−11.1%). Furthermore, while the amount of glucose decreases significantly in stressed Cellina di Nardò plants (≈18%), an increase was observed in Leccino plants under drought/Xf combined stresses (+11.2%). An opposite behavior among cvs was also observed for sucrose, as an accumulation of the disaccharide was recorded in stressed Leccino plants (≈37%). The different response to combined stress by Xf-resistant plants was confirmed considering genes coding for the sucrose or monosaccharide transporter (OeSUT1, OeMST2), the cell wall or vacuolar invertase (OeINV-CW, OeINV-V), the granule-bound starch synthase I (OeGBSSI) and sucrose synthase (OeSUSY), with a higher expression than at least one single stress (e.g., ≈1-fold higher or more than Xf for OeMST2, OeINV-CW, OeINV-V, OeGBSSI). It is probable that the pathways involved in drought stress response induce positive effects useful for pathogen resistance in cv Leccino, confirming the importance of investigating the mechanisms of cross-talk of biotic and abiotic responses.

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Section: Introductionmentioning

confidence: 99%

Xylella fastidiosa and Drought Stress in Olive Trees: A Complex Relationship Mediated by Soluble Sugars

Pascali

Vergine

Negro

et al. 2022

Biology

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“…The collected references were downloaded and imported into an EndNote X9 library (Clarivate Analytics). Duplicates and references already included in the update published in January 2022 (EFSA, 2022) were removed using EndNote X9 and the remaining references were uploaded on DistillerSR online 3 together with the full texts in portable document format (pdf).…”

Section: Search Termsmentioning

confidence: 99%

Update of the Xylella spp. host plant database – systematic literature search up to 31 December 2021

Delbianco¹,

Gibin²,

Pasinato³

et al. 2022

EFS2

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This Scientific report provides an update of the Xylella spp. host plant database, aiming to provide information and scientific support to risk assessors, risk managers and researchers dealing with Xylella spp. Upon a mandate of the European Commission, EFSA created and regularly updated a database of host plant species of Xylella spp. The current mandate covers the period 2021–2026. This report is related to the sixth version of the database published in Zenodo in the EFSA Knowledge Junction community, covering literature published from 1 July 2021 up to 31 December 2021, and recent Europhyt outbreak notifications. Informative data have been extracted from 29 selected publications. Eleven new host plants were identified and added to the database: six plant species naturally infected by subsp. multiplex of X. fastidiosa in the EU (France, Italy and Portugal) and five plant species artificially infected by different X. fastidiosa subspecies ( multiplex , pauca , fastidiosa and sandyi ). No additional data were retrieved for X. taiwanensis . New information on the tolerant/resistant response of plant species to X. fastidiosa infection were added, while no new STs have been identified worldwide compared to the previous update published in January 2022. The overall number of Xylella spp. host plants determined with at least two different detection methods or positive with one method (between: sequencing, pure culture isolation) reaches now 412 plant species, 190 genera and 68 families. Such numbers rise to 664 plant species, 299 genera and 88 families if considered regardless of the detection methods applied.

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“…This issue has spurred the implementation of programs of selection to control diseases and reduce crop losses [68]. In 2021, as part of a screening for genotypes potentially resistant to X. fastidiosa, a study on genetic diversity in a large collection of Mediterranean olive trees highlighted a strong genetic relationship of a Tunisian cultivar with the Italian varieties 'Leccino' and 'FS17', which are resistant to X. fastidiosa, thus indicating their potential, not only for Tunisian but for the entire Mediterranean basin's olive breeding [81].…”

Section: Olive Breeding In Tunisiamentioning

confidence: 99%

The Status of Genetic Resources and Olive Breeding in Tunisia

Debbabi

Amar

Rahmani

et al. 2022

Plants

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The olive tree, an iconic symbol of the Mediterranean basin, is the object of growing international interest in the production of olive oil for the world food market. In Tunisia, which is the fourth-largest producer of olive oil in the world, the production of olives and olive oil is of great socio-economic importance. Cultivation is widespread from north to south, but it is carried out using traditional techniques that results in extremely irregular production levels. To maintain their competitiveness on the international market, Tunisian producers must improve the quality of the oil through breeding plans that enhance the rich genetic heritage that is still not adequately exploited. The objective of this review is to present the state of olive breeding in Tunisia, illustrating the opportunities available for a better use of the rich Tunisian genetic heritage, the challenges it must face, and the need to multiply the efforts for sustainability, even in the light of the challenges posed by climate changes.

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Screening of Olive Biodiversity Defines Genotypes Potentially Resistant to Xylella fastidiosa

Cited by 30 publications

References 35 publications

Xylella fastidiosa and Drought Stress in Olive Trees: A Complex Relationship Mediated by Soluble Sugars

Xylella fastidiosa and Drought Stress in Olive Trees: A Complex Relationship Mediated by Soluble Sugars

Update of the Xylella spp. host plant database – systematic literature search up to 31 December 2021

The Status of Genetic Resources and Olive Breeding in Tunisia

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