Cryptic speciation in the nematode family Longidoridae from South America: description of Xiphinema cryptocostaricense sp. nov. from Colombia and notes on X. seinhorsti

IF 1.7 3区 农林科学 Q2 AGRONOMY
Franciszek Kornobis, Natalia Osten-Sacken, Grażyna Winiszewska, Pablo Castillo
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Abstract

The genus Xiphinema Cobb, 1913 belongs to the family Longidoridae and consists of approximatelly 280 described species of plant-root ectoparasites. They occur on all continents except Antarctica and many species are important pests of crops, harming plants either by direct parasiting or by vectoring of nepoviruses. Due to their economic importance, several species were subjected to regulations aimed to limit their global spread. Moreover, the use of molecular techniques allowed to confirm the occurrence of cryptic species within the genus. In this paper we describe Xiphinema cryptocostaricense sp. nov., which constitutes the first instance of cryptic speciation within the family Longidoridae from South America. In terms of morphology this species is characterised by the body measuring 2.00–2.35 mm; lip region detached from the body outline only by a shallow constriction; odontostyle 129–135 µm long; V = 34.0–36.6; anterior branch of the genital tract largely reduced; tail short, almost hemispherical; lack of males and presence of four juvenile stages. This species is also characterised using molecular markers D2-D3 expansion domains of 28S rRNA, ITS1 rRNA and partial cytochrome oxidase c subunit 1 gene sequences. Based on morphology, this species is indistinguishable from X. costaricense Lamberti and Tarjan (Nematologia Mediterranea, 2, 1–11 1974). Additionally, a nomenclature remark is given- the name X. cryptocostaricense sp. nov. has been created by adding prefix ‘crypto’ to an already existing name of species. The advanatage of this approach is that it immediately points to which species it is cryptic to. Finally, new data regarding the second species, X. seinhorsti are given, including a first report of this species outside the place of its original description, data on molecular markers and morphology, including the first description of the J1 and J2 stages.

Abstract Image

南美洲龙线虫科的隐性物种:描述来自哥伦比亚的 Xiphinema cryptocostaricense sp.
Xiphinema Cobb(1913 年)属龙虱科,由大约 280 种已描述的植物根系外寄生虫组成。它们分布在除南极洲以外的各大洲,许多种类是农作物的重要害虫,通过直接寄生或传播肾病毒危害植物。由于其经济重要性,一些物种受到旨在限制其全球传播的法规的管制。此外,分子技术的使用也证实了该属中隐匿物种的存在。本文描述了 Xiphinema cryptocostaricense sp.在形态学方面,该物种的特征是体长 2.00-2.35 mm;唇区与体轮廓仅有一个浅浅的缢缩;尾柄长 129-135 µm;V = 34.0-36.6;生殖道前支大部分退化;尾短,几乎呈半球形;没有雄虫,存在四个幼虫阶段。该物种的特征还通过分子标记 28S rRNA 的 D2-D3 扩增域、ITS1 rRNA 和部分细胞色素氧化酶 c 亚单位 1 基因序列来确定。根据形态,该物种与 X. costaricense Lamberti 和 Tarjan(Nematologia Mediterranea,2,1-11 1974)没有区别。cryptocostaricense sp. nov.的名称是通过在已有的物种名称中添加前缀 "crypto "而创建的。这种方法的优点是可以立即指出它是哪个物种的隐生种。Seinhorsti 的新数据,包括该物种在其原始描述地之外的首次报告、分子标记和形态学数据,包括对 J1 和 J2 阶段的首次描述。
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来源期刊
European Journal of Plant Pathology
European Journal of Plant Pathology 农林科学-农艺学
CiteScore
4.20
自引率
5.60%
发文量
183
审稿时长
3 months
期刊介绍: The European Journal of Plant Pathology is an international journal publishing original articles in English dealing with fundamental and applied aspects of plant pathology; considering disease in agricultural and horticultural crops, forestry, and in natural plant populations. The types of articles published are :Original Research at the molecular, physiological, whole-plant and population levels; Mini-reviews on topics which are timely and of global rather than national or regional significance; Short Communications for important research findings that can be presented in an abbreviated format; and Letters-to-the-Editor, where these raise issues related to articles previously published in the journal. Submissions relating to disease vector biology and integrated crop protection are welcome. However, routine screenings of plant protection products, varietal trials for disease resistance, and biological control agents are not published in the journal unless framed in the context of strategic approaches to disease management.
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