New occurrence of Meloidogyne graminicola (Nematoda: Meloidogyninae) from rice fields in Italy: Variability and phylogenetic relationships,Ecology and Evolution

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New occurrence of Meloidogyne graminicola (Nematoda: Meloidogyninae) from rice fields in Italy: Variability and phylogenetic relationships
Ecology and Evolution ( IF 2.3 ) Pub Date : 2022-09-20 , DOI: 10.1002/ece3.9326
Elena Fanelli ₁ , Francesca Gaffuri ₂ , Alberto Troccoli ₁ , Stefano Sacchi ₂ , Francesca De Luca ₁

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Since the first detection of Meloidogyne graminicola in Piedmont, North Italy, in 2016, further inspections for the presence of the rice root-knot nematode were carried out in rice fields of neighboring regions, in accordance with the Italian NPPO (National Plant Protection Organization) to support the official phytosanitary measures, to enable the early detection of the rice pest, and to prevent its spread within the national territory. In 2018, surveys of rice fields in Lombardy region revealed a new occurrence of M. graminicola. In the present study, we confirmed the identification of the rice nematode in Lombardy using the ribosomal ITS region and the mitochondrial COI and COII genes. The sequences and phylogenetic analyses revealed that Lombardy M. graminicola population grouped in all trees in the main cluster containing Meloidogyne species belonging to graminis group, but always in a different subgroup compared to the Piedmont population of M. graminicola. These results clearly suggest that the two Italian populations have been recently and independently introduced and confirm that the geographic origin is not the main factor leading to M. graminicola population variability.

中文翻译：

意大利稻田中新出现的根结线虫（线虫纲：根结线虫亚科）：变异性和系统发育关系

意大利国家植物保护组织表示，自2016年在意大利北部皮埃蒙特首次发现禾本科根结线虫以来，意大利国家植物保护组织在邻近地区的稻田中进一步检查了水稻根结线虫的存在情况。支持官方植物检疫措施，尽早发现水稻害虫，并防止其在国内蔓延。 2018年，对伦巴第地区稻田的调查发现了新出现的禾谷小霉（M. graminicola） 。在本研究中，我们利用核糖体 ITS 区域和线粒体 COI 和 COII 基因证实了伦巴第水稻线虫的鉴定。序列和系统发育分析表明，伦巴第M. graminicola种群在包含属于禾本科组的根结线虫属物种的主簇中的所有树木中均分组，但与皮埃蒙特M. graminicola种群相比始终处于不同的亚群。这些结果清楚地表明，这两个意大利种群是最近独立引入的，并证实地理起源并不是导致M. graminicola种群变异的主要因素。

更新日期：2022-09-21

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