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(Nematoda: Longidoridae) with Description of a New Species Eur J Plant Pathol (2020) 158:59–81 https://doi.org/10.1007/s10658-020-02055-0 An integrative taxonomic study of the needle nematode complex Longidorus goodeyi Hooper, 1961 (Nematoda: Longidoridae) with description of a new species. Ruihang Cai & Tom Prior & Bex Lawson & Carolina Cantalapiedra-Navarrete & Juan E. Palomares-Rius & Pablo Castillo & Antonio Archidona-Yuste Received: 14 April 2020 /Revised: 8 June 2020 /Accepted: 19 June 2020 /Published online: 26 June 2020 # The Author(s) 2020 Abstract Needle nematodes are polyphagous root- and slightly offset by a depression with body contour, ectoparasites parasitizing a wide range of economically amphidial pouch with slightly asymmetrical lobes, important plants not only by directly feeding on root odontostyle 80.5–101.0 µm long, tail short and conoid cells, but also by transmitting nepoviruses. This study rounded. Longidorus panderaltum n. sp. is quite similar deciphers the diversity of the complex Longidorus to L. goodeyi and L. onubensis in major morphometrics goodeyi through integrative diagnosis method, based and morphology. However, differential morphology in on a combination of morphological, morphometrical, the tail shape of first-stage juvenile, phylogeny and multivariate analysis and molecular data. A new haplonet analyses indicate they are three distinct valid Longidorus species, Longidorus panderaltum n. sp. is species. This study defines those three species as mem- described and illustrated from a population associated bers of L. goodeyi complex group and reveals the taxo- with the rhizosphere of asphodel (Asphodelus ramosus nomical complexity of the genus Longidorus.This L.) in southern Spain. Morphologically, L. panderaltum L. goodeyi complex group demonstrated that the biodi- n. sp. is characterized by having a moderately long versity of Longidorus in this region is still not fully female body (5.2-7.0 mm), lip region bluntly rounded clarified. R. Cai : C. Cantalapiedra-Navarrete : J. E. Palomares-Rius : Keywords: 18S rDNA . 28S rDNA D2-D3 . Species P. Castillo description . ITS1 . Longidorids . Multivariate analysis . Institute for Sustainable Agriculture (IAS), Spanish National Morphometry . Phylogeny . Taxonomy Research Council (CSIC), Avenida Menéndez Pidal s/n, Campus de Excelencia Internacional Agroalimentario, ceiA3, 14004 Córdoba, Spain Introduction R. Cai Laboratory of Plant Nematology, Institute of Biotechnology, College of Agriculture & Biotechnology, Zhejiang University, Needle nematodes of the genus Longidorus Micoletzky, Zhejiang 310058 Hangzhou, People’s Republic of China 1922 are a globally important group of ectoparasitic nematodes and considered a major group of plant-path- T. Prior : B. Lawson Fera Science Ltd, Sand Hutton, York YO41 1LZ, UK ogens. These nematodes use their needle stylet to feed on the apical root cells inducing galls in the tips and A. Archidona-Yuste (*) reducing the yield and quality of a range of horticultural Department of Ecological Modelling, Helmholtz Centre for or agricultural crops and some of them are recognised as Environmental Research - UFZ, Permoserstrasse 15, 04318 Leipzig, Germany vectors of important nepovirus (Taylor and Brown e-mail: [email protected] 1997;DecraemerandRobbins2007;Palomares-Rius et al. 2017a). Parasitism by Longidorus spp. have a 60 Eur J Plant Pathol (2020) 158:59–81 detrimental effect on root growth by inducing Archidona-Yuste et al. 2016b, 2019a;Lazarovaetal. hypertrophied uninucleate cells, highly active metabol- 2019; Amrei et al. 2020). Specifically, molecular ically, followed by hyperplasia with synchronized cell methods using different fragments of nuclear ribosomal division (Palomares et al. 2017a). This genus constitutes DNA (including 28S rRNA, 18S rRNA and ITS), mito- a great complex group of around 180 valid species chondrial DNA (cytochrome c oxidase subunit I, coxI (Archidona-Yuste et al. 2019a; Cai et al. 2020a, b; and nicotinamide dehydrogenase subunit 4. nad4)gene Amrei et al. 2020) and species delimitation is critical sequences have been used to provide precise identifica- from a phytopathological, ecological and biogeograph- tion of species and elucidate the phylogenetic relation- ical point of view. ships within the genus Longidorus (Ye et al. 2004;Neil- Several Longidorus spp. are distributed worldwide son et al. 2004; Palomares-Rius et al. 2008;Gutiérrez- whilst other species have a limited distribution (Brown Gutiérrez et al. 2012; Kumari and Subbotin 2012; and Taylor 1987; Robbins and Brown 1991; Sturhan et al. Subbotin et al. 2014; Archidona-Yuste et al. 2016a, b). 1997;Doucetetal.1998;Coomansetal.2001). Among In recent years, several studies have demonstrated them, Longidorus goodeyi Hooper, 1961 was described that the species diversity within the family Longidoridae from turf grasses at Rothamsted, UK, and has been re- remains as a major gap in the biodiversity of soil nem- ported sporadically in several European countries includ- atodes, particularly in the Iberian Peninsula which is ing Belgium, Bulgaria, France, Germany, Malta, Poland, considered a plausible speciation centre for this family Portugal, Slovak Republic, Spain, The Netherlands (Coomans 1996; Archidona-Yuste et al. 2016a, b;Cai (Lamberti et al. 1982; Arias et al. 1985; Tophan and et al. 2020a, b). This suggests that the continued sys- Alphey 1985; De Waele and Coomans 1990; Lisková tematic sampling in unexplored environments in this and Brown 1998; Gutiérrez-Gutiérrez et al. 2016), and area could lead to an increase in the overall species Tadzhikistan (Kankina and Melitskaya 1983). In Spain, richness of this group of nematodes. Following this Longidorus goodeyi has only been reported in central sampling strategy during the spring of 2019 in southern regions (Arias et al. 1985) associated with cereals and Spain, we observed a high density of a needle nematode common horehound (Marrubium vulgare L.). Surprising- morphologically resembling Longidorus goodeyi sug- ly, this species was not detected in southern Spain during gesting a wider geographical distribution for this nema- systematic and exhaustive nematode surveys on several tode species or the occurrence of a new species complex crops and natural environments carried out throughout the within the genus Longidorus.Thisfactpromptedusto last four decades (Arias 1977; Arias et al. 1985; Gutiérrez- undertake a detailed comparative morphological and Gutiérrez et al. 2011, 2013; Archidona-Yuste et al. 2016b; molecular study with previous reported data including 2019a, b; Cai et al. 2020a, b). topotype specimens of this species. In addition, a de- The morphological convergence among Longidorus tailed integrative approach was conducted in order to spp. and the existence of cryptic species complexes make clarify the taxonomical status of the new nematode the accurate identification of species considerably more population detected where the preliminary results indi- difficult (De Luca et al. 2004;Gutiérrez-Gutiérrezetal. cated that this population belongs to an unknown 2013; Archidona-Yuste et al. 2016b, 2019a; Cai et al. Longidorus species and therefore, the existence of a 2020a, b). In the family Longidoridae, morphological new species complex within this genus. Therefore, the and morphometric studies in addition to molecular se- objectives of this study were: (1) to discover the diver- quencing have been used simultaneously to group spec- sity of L. goodeyi complex through integrative taxono- imens into species, including multivariate analysis using my combining morphological analysis and a species morphometric characters in which a high number of delineation approach based on multivariate morphomet- measured individuals were analysed in order to find ric methods and nuclear haplonets tools; (2) to describe morphometric differences amongst them (Archidona- a new species of the genus Longidorus which belongs to Yuste et al. 2016a; Cai et al. 2020b). Also, the utility of the L. goodeyi complex group; (3) to characterise mo- DNA barcoding and molecular species delimitation ap- lecularly the sampled Longidorus sp. population using proaches in species discovery and the detection of cryptic the D2-D3 expansion segments of the 28S rRNA gene, lineages into the genus Longidorus have been demon- ITS1 and partial 18S rRNA gene; and (4) to study the strated by numerous studies (Ye et al. 2004;Gutiérrez- phylogenetic relationships of the identified Longidorus Gutiérrez et al. 2013;Palomares-Riusetal.2017c; species with available sequenced species. Eur J Plant Pathol (2020) 158:59–81 61 Material and methods Nematode population sampling, extraction and morphological identification I Specimens from the population of the unidentified Longidorus species were collected during the spring season of 2019 in a natural pasture of asphodel (Asphodelus ramosus L.) with a stony soil at 1,800 m 271716 MT270783-MT270786 elevation in La Pandera Mountain, Valdepeñas de Jaén, Jaén province, in Andalusia, southern Spain (Table 1). 18S cox Soil samples were collected using a shovel, randomly selecting four to five cores, and considering the upper 5– partial 50 cm depth of soil. Nematodes were extracted from a 500-cm3 sub-sample of soil by centrifugal flotation and 271732 MT271719-MT271720 - a modification of Cobb´s decanting and sieving methods (Coolen 1979; Flegg 1967). Specimens for study using light microscopy (LM) and morphometric studies were killed and fixed in an 271721-MT271726 MT271715-MT MT271727-MT271728 MT271717-MT271718 - aqueous solution of 4% formaldehyde +
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