Distribution of parasitic nematodes in Kenyan rice fields and their relation to edaphic factors, rainfall and temperature

Namu, John; Karuri, Hannah; Alakonya, Amos; Nyaga, Justin; Njeri, Editah

doi:10.1007/s40858-017-0194-9

Cited by 14 publications

(7 citation statements)

References 26 publications

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“…Nematodes abundance and diversity are impacted by soil practices and soil texture. Our work supports previous findings that soil physicochemical factors and climatic variables are heavily linked to PPN communities composition and abundance levels (Palomares-Rius et al, 2015;Aït Hamza et al, 2018;Namu et al, 2018).…”

Section: Correspondences Of Plant Parasitic Nematodes To Climatic Varsupporting

confidence: 92%

“…The multiblock analysis showed that Ditylenchus, Helicotylenchus, Pratylenchus and Paratylenchus were related to the humidity that occurred in Taliouine while Aphelenchoides, Tylenchus, Tylenchorynchus and Dorylaimus were found in rainy locations of Taznakht. Herein, climatic conditions are the driving force to structure PPN communities particularly through rainfall and humidity (Aït Hamza et al, 2018;Ferreira et al, 2018;Namu et al, 2018). Conversely maximum temperature had an insignificant impact on PPN communities what has been confirmed by Namu et al (2018).…”

Section: Correspondences Of Plant Parasitic Nematodes To Climatic Varmentioning

confidence: 79%

“…Herein, climatic conditions are the driving force to structure PPN communities particularly through rainfall and humidity (Aït Hamza et al, 2018;Ferreira et al, 2018;Namu et al, 2018). Conversely maximum temperature had an insignificant impact on PPN communities what has been confirmed by Namu et al (2018). The diversity and the distribution of PPN communities are influenced by temperature and moisture (Neilson and Boag, 1996;Todd et al, 1999;Bakonyi et al, 2007;Nielsen et al, 2014).…”

Section: Correspondences Of Plant Parasitic Nematodes To Climatic Varmentioning

confidence: 85%

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Plant-parasitic nematodes parasitizing saffron in Morocco: Structuring drivers and biological risk identification

Benjlil

Elkassemi

Hamza

et al. 2020

Applied Soil Ecology

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Plant-parasitic nematodes (PPN) are the most destructive of all plant pathogens. They are an economically important group of soil pathogens, causing significant annual damages of up to 25% of world crop production. Morocco is considered to be a highly productive country for the colorant/medicinal/spice saffron (Crocus sativus L.). Taliouine and Taznakht regions are the most productive areas of this valuable neutraceutical. Due to its metabolic profile, and growth forms, saffron is susceptible to many plant diseases, including plant-parasitic nematodes (PPN). This work aims to assess the diversity of PPN communities in soils of Taliouine and Taznakht regions to facilitate understanding of links between their assemblages with biotic and abiotic parameters. Herein, nematode communities were characterized in 163 soil samples collected from 11 rural communes characterized by altitudinal gradients in Taliouine and Taznakht regions. Fifteen PPN genera belonging to 12 families were identified, among which the four genera Ditylenchus, Aphelenchoides, Pratylenchus and Helicotylenchus, potentiate serious limiting factors in saffron production. Their frequencies are respectively 92, 49, 48 and 36% in the area of Taliouine, while in Taznakht they represent 95, 69, 33, and 28% respectively. Regarding the assessment of diversity at different sites, the genus richness (R) index ranges from 2 to 10 distinct genera, whereas the Shannon diversity (H') index varies from 0.9 to 1.5 and the Evenness (E) index tends to 1. The Co-inertia analyses revealed a substantial relationship between nematode communities and soil types. Soil texture is the major factor influencing the presence and the abundance of a considerable portion of genera. Multivariate analyses (MBPLS) indicated links between humidity, rainfall, minimum temperature and PPN taxa, though maximum temperature did not have an impact. Ditylenchus, Helicotylenchus, Pratylenchus and Paratylenchus were related to the humidity and silt soil that developed in Taliouine. Aphelenchoides, Tylenchus, Tylenchorynchus and Dorylaimus were more prevalent in rainy locations and clay soils of Taznakht. Suitable nematode controlling approaches may be applied and preventative measures should be considered at nursery and field level.

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Section: Correspondences Of Plant Parasitic Nematodes To Climatic Varsupporting

confidence: 92%

Section: Correspondences Of Plant Parasitic Nematodes To Climatic Varmentioning

confidence: 79%

Section: Correspondences Of Plant Parasitic Nematodes To Climatic Varmentioning

confidence: 85%

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Plant-parasitic nematodes parasitizing saffron in Morocco: Structuring drivers and biological risk identification

Benjlil

Elkassemi

Hamza

et al. 2020

Applied Soil Ecology

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“…In contrary to what has often been reported about the prevalence of rainfed rice nematode (Namu et al, 2018), only 2 genera (Helicotylenchus and Scutellonema) have been recorded from upland ecosystem in the study. The low nematode prevalence in the upland ecosystem as observed in this survey could be explained by the rice variety which is mainly cultivated in this area in Togo.…”

Section: Discussioncontrasting

confidence: 99%

Occurrence, abundance and distribution of plant-parasitic nematodes associated with rice (<i>Oryza</i> spp.) in different rice agroecosystems in Togo

Gnamkoulamba¹,

Tounou²,

Tchabi³

et al. 2018

Int. J. Bio. Chem. Sci

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Rice is the second most important cereal in Togo. Among constraints that affect rice production, plant parasitic nematodes are of great importance. The objective of this study was to determine the distribution, abundance and frequency of plant nematodes in different agroecological zones of Togo. A total of 50 composite soil and root samples (25 each) were taken from 25 fields (5 per zone) randomly selected from the five agroecological zones. Nematodes were extracted from 100 ml soil and 1g fresh root samples using the Hermann techniques. Nematodes were then fixed and mounted on slide and identified to genus level using identification keys. The survey documented twelve plant-parasitic nematode genera among which ten, (Hirschmanniella spp., Meloidogyne spp., Xiphinema spp., Scutellonema spp., Helicotylenchus spp., Heterodera spp., Criconema spp., Pratylenchus spp., Trichodorus spp. and Tylenchid spp.), were recorded from lowland, two (Helicotylenchus and Scutellonema) from upland and five (Dolichodorus spp., Helicotylenchus spp., Tylenchorhynchus spp., Scutellonema spp. and Xiphinema spp.), from flooded ecosystem. Hirschmanniella spp., Meloidogyne spp and Helicotylenchus spp. were the most frequent and abundant plant-parasitic nematode genera recorded from more than 71% of the samples. Helicotylenchus spp., Hirschmanniella spp., Meloidogyne spp. and Scutellonema spp., were recorded in both soil and root samples while Pratylenchus spp., Heterodera spp. and Tylenchorhynchus spp., were found to be associated to root and Trichodorus spp., Tylenchid spp., Xiphinema spp., Criconema spp. and Dolichodorus spp., were recorded from soil samples only. The high diversity of nematode genera recorded in the survey is attributed to the rice ecosystem, which is mostly characterized by lowland ecosystem with intensive cropping. This study established the evidence that nematodes could be important constraints for rice production, suggesting further research focusing on their damage potential and development of effective rice nematode management strategy for sustainable rice production in Togo.

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“…were also not detected in the soils of Sagaing, indicating that rotation with paddy rice might be effective to control these PPN, due to the flooded conditions [21]. Indeed, Heterodera and some other PPN were not detected in paddy rice fields [22].…”

Section: Discussionmentioning

confidence: 95%

Distribution of Pigeon Pea Cyst Nematode and Root-Knot Nematodes in Major Sesame Growing Areas in Myanmar

Min

Naing

Htun³

et al. 2020

Agronomy

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The pigeon pea cyst nematode, Heterodera cajani, is an economically important plant-parasitic nematode in sesame production. The objective of the study was to investigate distribution of H. cajani in the major sesame producing areas in Myanmar. Before cultivation, soil samples were collected in 96 local farmer’s fields: (19 fields in Magway, 20 fields in Mandalay, 14 fields in Sagaing and 43 in Nay Pyi Taw), and nematode density was quantified by real-time PCR. The cyst nematode was detected in 63.2% of the fields in Magway and the mean density was 22.6 eggs equivalent (20 g soil)−1. In Mandalay and Nay Pyi Taw, the cyst nematode was detected in 40.0% and 18.6% of the fields with the mean densities of 9.9 and 21.0 eggs equivalent (20 g soil)−1, respectively. By contrast, the cyst nematode was not detected in Sagaing fields, in which sesame is rotated with paddy rice. Infestation of root-knot nematodes (RKN, Meloidogyne spp.) was also evaluated, because sesame is generally rotated with rice and pulses, which are attacked by RKN. The results showed 25.6% infestation of RKN with a mean density of 34.3 eggs equivalent (20 g soil)−1 only in Nay Pyi Taw, while there was no infestation in Magway, Mandalay, and Sagaing. The relationships between the nematode infestation level and the cropping patterns in each sesame growing area in Myanmar were discussed.

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Distribution of parasitic nematodes in Kenyan rice fields and their relation to edaphic factors, rainfall and temperature

Cited by 14 publications

References 26 publications

Plant-parasitic nematodes parasitizing saffron in Morocco: Structuring drivers and biological risk identification

Plant-parasitic nematodes parasitizing saffron in Morocco: Structuring drivers and biological risk identification

Occurrence, abundance and distribution of plant-parasitic nematodes associated with rice (<i>Oryza</i> spp.) in different rice agroecosystems in Togo

Distribution of Pigeon Pea Cyst Nematode and Root-Knot Nematodes in Major Sesame Growing Areas in Myanmar

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