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  • 1
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    Online Resource
    A global database of soil nematode abundance and functional group composition
    Springer Science and Business Media LLC ; 2020
    In:  Scientific Data Vol. 7, No. 1 ( 2020-03-26)
    Details
    In: Scientific Data, Springer Science and Business Media LLC, Vol. 7, No. 1 ( 2020-03-26)
    Abstract: As the most abundant animals on earth, nematodes are a dominant component of the soil community. They play critical roles in regulating biogeochemical cycles and vegetation dynamics within and across landscapes and are an indicator of soil biological activity. Here, we present a comprehensive global dataset of soil nematode abundance and functional group composition. This dataset includes 6,825 georeferenced soil samples from all continents and biomes. For geospatial mapping purposes these samples are aggregated into 1,933 unique 1-km pixels, each of which is linked to 73 global environmental covariate data layers. Altogether, this dataset can help to gain insight into the spatial distribution patterns of soil nematode abundance and community composition, and the environmental drivers shaping these patterns.
    Type of Medium: Online Resource
    ISSN: 2052-4463
    URL: Article
    DOI: 10.1038/s41597-020-0437-3
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2775191-0
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  • 2
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    Meloidogyne brasiliensis Charchar & Eisenback, 2002 is a junior synonym of M. ethiopica Whitehead, 1968
    Brill ; 2017
    In:  Nematology Vol. 19, No. 6 ( 2017-07-19), p. 655-669
    Details
    In: Nematology, Brill, Vol. 19, No. 6 ( 2017-07-19), p. 655-669
    Abstract: The type population of Meloidogyne brasiliensis is synonymised under M. ethiopica based on morphological and morphometric similarities, as well as through biochemical, molecular and phylogenetic studies. Meloidogyne ethiopica was first described in 1968 in Tanzania using specimens from a single egg mass culture on tomato and re-described in 2004 using an isolate from Brazil. Meloidogyne brasiliensis was described in 2002 in Brazil based on specimens collected from tomato (type population) and pea. Morphological and morphometric studies of their descriptions showed important similarities in major characters as well as some general variability in others. Characterisation of esterase isozyme phenotypes of three populations of M. ethiopica from Brazil, Chile and Kenya, and two M. brasiliensis populations, resulted in only one esterase pattern (E3), a phenotype already known for M. ethiopica . In PCR assays, the species-specific 350 bp SCAR marker developed for M. ethiopica was amplified from the M. brasiliensis populations tested. In phylogenetic analyses based either on sequences of the ITS1-5.8S-ITS2 and D2-D3 (28S) rRNA regions or on RAPD and AFLP data, the populations of both species clustered together with a strong bootstrap support. Altogether, these results provide congruent evidence that M. brasiliensis is not a valid species but rather a junior synonym of M. ethiopica .
    Type of Medium: Online Resource
    ISSN: 1388-5545 , 1568-5411
    URL: Article
    DOI: 10.1163/15685411-00003078
    Language: Unknown
    Publisher: Brill
    Publication Date: 2017
    detail.hit.zdb_id: 2019332-4
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  • 3
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    Additional information on Meloidogyne polycephannulata and its proposal as a junior synonym of M. incognita
    Brill ; 2019
    In:  Nematology Vol. 21, No. 2 ( 2019-02-01), p. 129-146
    Details
    In: Nematology, Brill, Vol. 21, No. 2 ( 2019-02-01), p. 129-146
    Abstract: The type population of Meloidogyne polycephannulata is synonymised with M. incognita based on morphological and morphometric characters, as well as biochemical, molecular and phylogenetic studies. Morphological variability and a wide host range were reported for M. incognita during its first description and later re-description. Meloidogyne polycephannulata was described in Brazil from specimens collected in a carrot field (type population). The esterase phenotype (Est) characterised for this species was identical to the phenotype Est I2 of M. incognita , the most ubiquitous phenotype used for diagnostics. Morphological and morphometric characters of the descriptions of the two nominal species showed major similarities, as well as variability within the range of variation detected in M. incognita . In PCR assays, three SCAR markers species-specific for M. incognita (incK14 F/R, Mi/FR and incB06 F/R) amplified the same fragments of 399 bp, 955 bp and 1200 bp, respectively, for populations in both species. In phylogenetic studies based either on concatenated sequences of ITS1-5.8S-ITS2, D2-D3 rRNA, mitochondrial CO II regions or on RAPD and AFLP data, the populations of both species grouped in the same clade with high bootstrap support. Altogether, these results provide congruent evidence that the M. polycephannulata type isolate deposited at the Embrapa Cryopreserved National Collection of Root-knot Nematodes is not a valid species but rather a junior synonym of M. incognita .
    Type of Medium: Online Resource
    ISSN: 1388-5545 , 1568-5411
    URL: Article
    DOI: 10.1163/15685411-00003202
    Language: Unknown
    Publisher: Brill
    Publication Date: 2019
    detail.hit.zdb_id: 2019332-4
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  • 4
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    First report of, and additional information on, Meloidogyne konaensis (Nematoda: Meloidogyninae) parasitising various crops in Brazil
    Brill ; 2016
    In:  Nematology Vol. 18, No. 7 ( 2016-07-22), p. 831-844
    Details
    In: Nematology, Brill, Vol. 18, No. 7 ( 2016-07-22), p. 831-844
    Abstract: In a survey for Meloidogyne spp. in different crops from 11 regions in Ceará State, Brazil, using esterase isozyme electrophoresis as a specific identification method, four atypical populations were characterised from cabbage, papaya, noni and canapum plants, all of which showed an esterase profile different from those previously detected in Brazil. Morphological studies showed typical characteristics of Meloidogyne konaensis . Perineal patterns of females were variable, similar to M. arenaria and M. incognita , stylet length 14-20 μm. In females, the knobs gradually merged with the shaft and the dorsal pharyngeal gland orifice (DGO) ranged from 4 to 7 μm. Although males are not frequently found, the stylet morphology provides the most useful source of diagnostic character for the species, having 6-12 large projections protruding from the shaft. The esterase pattern K3 is unique and species-specific with three major bands Rm 1.0, 1.17, 1.27 and a secondary band Rm 1.10. Some confusion about the true identity of this species was clarified in this study, including differentiation from M. paranaensis . A species-specific SCAR marker developed for M. paranaensis was tested and no amplification products were observed. In Neighbour-Joining analyses of ITS and D2-D3 rRNA sequences, M. konaensis from Brazil appeared clearly separated from M. paranaensis . Pathological tests indicated that coffee is not a host of M. konaensis as previously reported in the original description of this species.
    Type of Medium: Online Resource
    ISSN: 1388-5545 , 1568-5411
    URL: Article
    DOI: 10.1163/15685411-00002997
    Language: Unknown
    Publisher: Brill
    Publication Date: 2016
    detail.hit.zdb_id: 2019332-4
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  • 5
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    Genetic diversity of Meloidogyne spp. from rice and identification of multiresistant sources in Oryza spp. accessions
    Wiley ; 2021
    In:  Plant Pathology Vol. 70, No. 9 ( 2021-12), p. 2217-2228
    Details
    In: Plant Pathology, Wiley, Vol. 70, No. 9 ( 2021-12), p. 2217-2228
    Abstract: Recently a Meloidogyne species complex was detected parasitizing and causing damage to irrigated rice in southern Brazil, highlighting the need to study the genetic diversity of these species and their pathogenicity to Oryza spp. in order to select genotypes of rice with multiple resistance. This study compared the genetic diversity of Brazilian Meloidogyne spp. isolates from irrigated rice and evaluated the reaction of four wild accessions of Oryza species ( O . glumaepatula , O . longistaminata , O . grandiglumis , and O . alta ) and two cultivated species, O . glaberrima and O . sativa (control) to M . ottersoni , M . oryzae , and two variants of M . graminicola (Est G2 and Est G3). Genetic variability was assessed using RAPD and AFLP markers. M . graminicola and M . ottersoni showed high intraspecific variability: 83.76% and 41.14%, respectively. Cluster analysis showed a clear separation among rice root‐knot nematodes (RKNs) into subclades according to their esterase phenotypes with 100% bootstrap. For rice resistance screening, plants were inoculated with 5,000 eggs, and the nematode reproduction factor evaluated 90–120 days postinoculation. O . glumaepatula , an American wild species, was highly resistant or resistant to all rice RKNs tested and is a valuable source of multiple resistance. Overall, the other rice species also showed different levels of resistance. Conversely, O . longistaminata exhibited low levels of resistance. M . graminicola Est G3 was the most aggressive isolate. Sources of resistance against RKN in wild Oryza genotypes, especially in an AA genome like O . glumaepatula , may be of great interest for future breeding programmes in cultivated rice.
    Type of Medium: Online Resource
    ISSN: 0032-0862 , 1365-3059
    URL: Issue
    URL: Article
    DOI: 10.1111/ppa.v70.9
    DOI: 10.1111/ppa.13438
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2020845-5
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  • 6
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    Integrative taxonomy of Meloidogye ottersoni (Thorne, 1969) Franklin, 1971 (Nematoda: Meloidogynidae) parasitizing flooded rice in Brazil
    Springer Science and Business Media LLC ; 2020
    In:  European Journal of Plant Pathology Vol. 157, No. 4 ( 2020-08), p. 943-959
    Details
    In: European Journal of Plant Pathology, Springer Science and Business Media LLC, Vol. 157, No. 4 ( 2020-08), p. 943-959
    Type of Medium: Online Resource
    ISSN: 0929-1873 , 1573-8469
    URL: Article
    DOI: 10.1007/s10658-020-02049-y
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 1477679-0
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  • 7
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    Oryza glumaepatula , a New Source of Resistance to Meloidogyne graminicola and Histological Characterization of Its Defense Mechanisms
    Scientific Societies ; 2019
    In:  Phytopathology® Vol. 109, No. 11 ( 2019-11), p. 1941-1948
    Details
    In: Phytopathology®, Scientific Societies, Vol. 109, No. 11 ( 2019-11), p. 1941-1948
    Abstract: Meloidogyne graminicola causes significant damage to rice fields worldwide. Sources of resistance to M. graminicola reported in Oryza sativa are limited. Resistance to this species has been found in other Oryza species such as O. glaberrima and O. longistaminata. This study aimed to evaluate the reaction of four wild species of Oryza from the Embrapa Rice and Bean Germplasm Bank (Goiás, Brazil) to a pool of M. graminicola populations and determine the resistance mechanism in O. glumaepatula. Two genotypes of O. glaberrima, one of O. alta, three of O. glumaepatula, one of O. grandiglumis, one of O. longistaminata, and one of O. sativa (control) were included in the study. The results showed that O. glumaepatula was highly resistant (reproduction factor [RF] 〈 1). O. glaberrima, O. alta, and O. grandiglumis were considered moderately resistant. O. longistaminata was susceptible, although values of RF remained lower than the control O. sativa ‘BR-IRGA 410’, considered highly susceptible. Histological observations on the interaction of O. glumaepatula and M. graminicola showed reduced penetration of second-stage juveniles (J2s) when this resistant wild accession was compared with O. sativa. An intense hypersensitivity response-like reaction occurred at 2 days after inoculation in the root cortex of the resistant accession. Few J2s established in the central cylinder, and rare collapsed giant cells were observed surrounded by degenerate females. Fluorescence microscopy in O. glumaepatula revealed giant cells and the female body presumably exhibiting accumulation of phenolic compounds. Our study suggests that wild rice accessions, especially from the AA genotype (e.g., O. glumaepatula), are of great interest for use in future breeding programs with Oryza spp.
    Type of Medium: Online Resource
    ISSN: 0031-949X , 1943-7684
    URL: Article
    DOI: 10.1094/PHYTO-02-19-0044-R
    Language: English
    Publisher: Scientific Societies
    Publication Date: 2019
    detail.hit.zdb_id: 2037027-1
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  • 8
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    Reaction of soybean cultivars to two races of Meloidogyne enterolobii and their aggressiveness under plastic house conditions
    Brill ; 2023
    In:  Nematology Vol. 25, No. 8 ( 2023-09-25), p. 929-940
    Details
    In: Nematology, Brill, Vol. 25, No. 8 ( 2023-09-25), p. 929-940
    Abstract: Limited information is available regarding the susceptibility or resistance of soybean cultivars to Meloidogyne enterolobii . Recently, a new race of this species was detected in Brazil parasitising cotton and soybean. This nematode has the potential to pose a problem in both of these crops, since it is pathogenic and virulent to several economically important plants that have resistance genes to other Meloidogyne species. The aim of this study was to assess the responses of EMBRAPA’s main soybean cultivars with confirmed resistance to M. incognita and M. javanica to the two races of M. enterolobii detected in Brazil. Additionally, this study aimed to characterise the aggressiveness of these nematode races. The experiments were conducted in a plastic house, in a factorial scheme with 16 soybean cultivars × two M. enterolobii races (guava and cotton), totalling 32 treatments × eight replications, and evaluated with two replications over time. Soybean sowing took place in pots containing 1.7 l of a mixture of soil, sand and Bioplant ® substrate (1:1:1), previously autoclaved. Each soybean plant was inoculated with 5000 eggs of M. enterolobii . After 75 days for the first experiment, and 90 days for the second, the following variables were evaluated: gall index (GI), egg mass index (EMI), total number of eggs per g root (NEGR) and the reproduction factor (RF). Both races of M. enterolobii showed reproductive ability in all soybean genotypes (with or without known genetic resistance), albeit with moderate to low values in comparison to their reproduction on tomato plants. The race from cotton was considered statistically more aggressive than the guava population on soybean cultivars. Only ‘BRS 7180 IPRO’ was moderately resistant to both races in both experiments. In view of the importance and prospects for expansion of the soybean crop, the findings of this study contribute to a better understanding of the resistance and aggressiveness exhibited by the two races of M. enterolobii , Moreover, the study highlights the significant challenge that lies ahead in developing breeding programmes to select soybean genotypes with multiple resistance to Meloidogyne spp.
    Type of Medium: Online Resource
    ISSN: 1388-5545 , 1568-5411
    URL: Article
    DOI: 10.1163/15685411-bja10266
    Language: Unknown
    Publisher: Brill
    Publication Date: 2023
    detail.hit.zdb_id: 2019332-4
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  • 9
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    Nematode communities as indicators of the status of a soil ecosystem influenced by mining practices in Brazil
    Brill ; 2016
    In:  Nematology Vol. 18, No. 3 ( 2016-03-7), p. 265-276
    Details
    In: Nematology, Brill, Vol. 18, No. 3 ( 2016-03-7), p. 265-276
    Abstract: This study evaluated the effects of mining practices using soil nematodes as bioindicators. Soil samples represented four different subsystems found in the CeBio Research Center, including natural/undisturbed (rainforest (RF) and savannah (SA)) and disturbed ( Eucalyptus spp. (EU) and grassland (GR)) subsystems. Ecological descriptors S (3.5-9.5), d (1.22-4.23) and MI (1.9-3.23) significantly differentiated the subsystem GR (high impact) from the other subsystems. Additionally, poorly covered soil ( i.e. , subsystem GR) negatively influenced the composition of nematode assemblages, and primarily so for nematodes with high c-p values. Among soil variables, pH strongly influenced the distribution of soil nematodes, negatively affecting the abundance of all c-p groups and diversity of nematodes. On the other hand, pH also positively affected FF and PP trophic groups in the subsystem GR. The similarity of subsystem EU and natural subsystems (RF and SA) suggests that soil restoration with Eucalyptus spp. appears to be an adequate management practice to promote the recovery of areas subjected to mining practices.
    Type of Medium: Online Resource
    ISSN: 1388-5545 , 1568-5411
    URL: Article
    DOI: 10.1163/15685411-00002958
    Language: Unknown
    Publisher: Brill
    Publication Date: 2016
    detail.hit.zdb_id: 2019332-4
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  • 10
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    Nematode community, trophic structure and population fluctuation in soybean fields
    FapUNIFESP (SciELO) ; 2003
    In:  Fitopatologia Brasileira Vol. 28, No. 3 ( 2003-06), p. 258-266
    Details
    In: Fitopatologia Brasileira, FapUNIFESP (SciELO), Vol. 28, No. 3 ( 2003-06), p. 258-266
    Abstract: Amostragens temporal (mensalmente em três campos por 12 meses) e espacial (uma vez, em 23 campos, de março a abril) foram feitas na principal região sojícola do Distrito Federal. Nos dois tipos de amostragem foram encontrados 53 gêneros de nematóides, sendo 13 deles detectados apenas pela temporal e um somente pela espacial. Do total, 53% foram fitoparasitos, 35% bacteriófagos e cerca de 12% micófagos, predadores e onívoros. Esses constituíram a comunidade de nematóides, dominada por Helicotylenchus (40% da abundância total), Acrobeles (15%), Cephalobus (7,6%), Meloidogyne (5,6%) e Pratylenchus (4,9%). Heterodera glycines não foi encontrado neste estudo. Não houve diferença quanto aos índices Ds, H', Es, T, FF/BF, (FF+BF)/PP, MI, PPI, mMI e Dorylaimida (%) entre as duas amostragens, mas houve diferença quanto aos índices d e J'. Os fitoparasitas tiveram populações reduzidas no final do ciclo da cultura, se mantiveram em nível baixo na estação seca e no período de desenvolvimento inicial das plantas, aumentando durante o crescimento das mesmas. Os micófagos se mantiveram em baixa população durante o ano, mas se elevaram em junho e julho, período de pós-colheita, em que raízes se encontravam em decomposição por fungos do solo. Os bacteriófagos tiveram suas populações ligeiramente reduzidas durante a seca e a fase inicial das chuvas, mas se elevaram no meio da estação chuvosa, estando, aparentemente, associadas à alta umidade do solo. Dentre os cinco gêneros mais abundantes, Acrobeles e Pratylenchus povoaram mais solos úmidos, enquanto Cephalobus e Meloidogyne adaptaram bem em solos secos, mas Helicotylenchus sobreviveu abundantamente numa grande faixa de umidade.
    Type of Medium: Online Resource
    ISSN: 0100-4158
    URL: Article
    DOI: 10.1590/S0100-41582003000300006
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2003
    detail.hit.zdb_id: 2078802-2
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