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Prevalence and ecological factors affecting the distribution of plant-parasitic nematodes in Prunus groves in Spain

Ilenia Clavero-Camacho, Antonio Archidona-Yuste, Carolina Cantalapiedra-Navarrete, Pablo Castillo, Juan Emilio Palomares-Rius
2024, 23 (2): 566-589.   DOI: 10.1016/j.jia.2023.02.033
Abstract111)      PDF in ScienceDirect      
A wide survey was conducted to study plant-parasitic nematodes (PPNs) associated with Prunus groves in Spain.  This research aimed to determine the prevalence and distribution of PPNs in Prunus groves, as well as the influence of explanatory variables describing soil, climate and agricultural management in structuring the variation of PPNs community composition.  A total of 218 sampling sites were surveyed and 84 PPN species belonging to 32 genera were identified based of an integrative taxonomic approach.  PPN species considered as potential limiting factors in Prunus production, such as Meloidogyne arenaria, Mincognita, Mjavanica, Pratylenchus penetrans and Pvulnus, were identified in this survey.  Seven soil physico-chemical (C, Mg, N, Na, OM, P, pH and clay, loamy sand and sandy loam texture classes), four climate (Bio04, Bio05, Bio13 and Bio14) and four agricultural management variables (grove-use history less than 10 years, irrigation, apricot seedling rootstock, and Montclar rootstock) were identified as the most influential variables driving spatial patterns of PPNs communities.  In particular, younger plantations showed higher values for species richness and diversity indices than groves cultivated for more than 20 years with Prunus spp.  Our study increases the knowledge of the distribution and prevalence of PPNs associated with Prunus rhizosphere, as well as on the influence of explanatory variables driving the spatial structure PPNs communities, which has important implications for the successful design of sustainable management strategies in the future in this agricultural system.
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Morphological and molecular characterization of the rice root-knot nematode, Meloidogyne graminicola, Golden and Birchfeild, 1965 occurring in Zhejiang, China
TIAN Zhong-ling, Munawar Maria, Eda Marie Barsalote, Pablo Castillo, ZHENG Jing-wu
2018, 17 (12): 2724-2733.   DOI: 10.1016/S2095-3119(18)61971-9
Abstract365)      PDF in ScienceDirect      
The rice root-knot nematode Meloidogyne graminicola is a severe pest of rice.  In China, it was first reported from Hainan Province, and later from several other provinces.  In the present study, a rice root-knot nematode population found from the rice cultivation areas of Zhejiang Province, China is characterized via molecular analysis using internal transcribed spacer (ITS) and cytochrome c oxidase subunit II (coxII)-16S rRNA genes and scanning electron microscopy (SEM) observations of males and the second-stage juveniles.  Morphometric data and molecular sequence comparisons for all M. graminicola populations occurring in China are also provided.  The overall morphology of M. graminicola found in Zhejiang match well with the original description, though males have a slightly longer body and stylet, and a shorter tail, while the second-stage juvenile is also slightly longer than in the original description.  This is the first report of M. graminicola from Zhejiang.  Phylogenetic studies based on coxII suggest that all the Chinese populations belong to Type B.  This study expands knowledge of the increasing distribution and phylogenetic relationships of M. graminicola that occur in China. 
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