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Morphological and molecular characterisation of Pratylenchus oleae n. sp. (Nematoda: Pratylenchidae) parasitizing wild and cultivated olives in Spain and Tunisia

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Abstract

A new mono-sexual root-lesion nematode species, Pratylenchus oleae n. sp., parasitizing roots of olive plants cv. Koroneiki in commercial fields at Ouled Chamekh (central Tunisia), and wild and cultivated olive (cv. Picual) plants in Agua Amarga (southern Spain) is described. The new species is characterised by the female having a lip region slightly offset and bearing three annuli, stylet 16.5 (14.5-17.0) μm long, with prominent rounded knobs, pharyngeal overlapping rather long (22–36) μm, lateral fields areolated and with four incisures and diagonal lines in middle band, spermatheca rounded but non-functional, tail short, conoid-rounded to subcylindrical, usually annulated terminus, males unknown, and a specific D2-D3, ITS1, 18S-rRNA, hsp90 and COI sequences. Morphologically this species is related to P. cruciferus, P. delattrei, and P. kumamotoensis. The results of the phylogenetic analysis based on sequences of the D2-D3 expansion regions of 28S, partial 18S and ITS rRNA genes confirmed the close relationship of P. oleae n. sp. with P. dunensis, P. penetrans, P. pinguicaudatus, from which was clearly separated. A PCR-based diagnostic assay was also developed for identification of P. oleae n. sp. using the species-specific primers Poleae_fw1_4 and Poleae_rv1 that amplify a 547-bp fragment in the internal transcribed spacer (ITS1) region of ribosomal DNA, which clearly separate from other root-lesion nematodes damaging olive such as P. penetrans and P. vulnus.

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Notes

  1. The species epithet is derived from the Latin word oleae gen. fem. = olive (Olea europaea subsp. europaea), the plant from which the new species was isolated

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Acknowledgments

This research was supported by a grant 219262 ArimNET_ERANET FP7 2012–2015 Project PESTOLIVE ‘Contribution of olive history for the management of soilborne parasites in the Mediterranean basin’ from Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), grant AGR-136 from ‘Consejería de Economía, Innvovación y Ciencia’ from Junta de Andalucía, and Union Europea, Fondo Europeo de Desarrollo regional, “Una manera de hacer Europa”. The first author is a recipient of a “Juan de La Cierva” contract from Ministerio de Economía y Competitividad of Spain. The authors thank J. Martín Barbarroja and G. León Ropero from IAS-CSIC for the excellent technical assistance and Dr. J. A. Navas-Cortés (IAS-CSIC) for his critically reading of the manuscript prior to submission.

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Authors and Affiliations

  1. Instituto de Agricultura Sostenible (IAS), Consejo Superior de Investigaciones Científicas (CSIC), Campus de Excelencia Internacional Agroalimentario, ceiA3, Apdo. 4084, 14080, Córdoba, Spain

    Juan E. Palomares-Rius, Carolina Cantalapiedra-Navarrete & Pablo Castillo

  2. Department of Biological Sciences and Plant Protection, Higher Institute of Agronomy, University of Sousse, Chott Mariem, UR: R13AGR04, Bp47, 4042, Sousse, Tunisia

    Ilhem Guesmi & Najet Horrigue-Raouani

  3. Department of Animal Biology, Vegetal Biology and Ecology, University of Jaén, Campus ‘Las Lagunillas’ s/n, Edificio B3, 23071, Jaén, Spain

    Gracia Liébanas

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  1. Juan E. Palomares-Rius
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  2. Ilhem Guesmi
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  5. Gracia Liébanas
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  6. Pablo Castillo
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Correspondence to Pablo Castillo.

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Palomares-Rius, J.E., Guesmi, I., Horrigue-Raouani, N. et al. Morphological and molecular characterisation of Pratylenchus oleae n. sp. (Nematoda: Pratylenchidae) parasitizing wild and cultivated olives in Spain and Tunisia. Eur J Plant Pathol 140, 53–67 (2014). https://doi.org/10.1007/s10658-014-0443-4

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