Analysing the characteristics of soil nematode communities at pepper (Piper nigrum L.) cultivation area in Loc Hung commune, Loc Ninh district, Binh Phuoc province

Pepper (Piper nigrum L.) is a high economic value plant species that brings the main income to the people at Loc Hung commune. So the pepper’s yield plays a significant role in people’s life in this region. To assess the influence of environmental factors on the growth and development of pepper, we need to analyse the structural characteristics of soil nematode communities in order to promptly detect the levels of parasitic nematodes infection as well as assessment of soil environment status based on nematode communities. Study results at five sampling stations are analyses of 30 genera of nematodes belonging to 6 major trophic groups (bacterial feeders, fungal feeders, algal feeders, omnivores, carnivores and plant parasites). Calculation results of indices such as SUM(MI), SUM(MI2-5), MI and PPI showed that soil nematodes community is very little affected by the bacteria feeder group and the rate of parasitic nematode pepper quite severe. Analysis of correlation between trophic groups showed that nematodes are sensitive to environmental factors. This means the potential use of nematodes as a biological indicator for soil quality is possible. Hồ tiêu (Piper nigrum L.) là cây trồng có giá trị kinh tế cao và là nguồn thu nhập chính của người dân tại xã Lộc Hưng. Do đó, năng suất cây tiêu có ý nghĩa rất lớn đối với đời sống người dân trong vùng. Để đánh giá ảnh hưởng của các yếu tố môi trường lên sự sinh trưởng và phát triển của cây tiêu, cần phải phân tích đặc trưng cấu trúc quần xã tuyến trùng đất của vùng nhằm phát hiện kịp thời mức độ nhiễm tuyến trùng ký sinh trên hồ tiêu cũng như đánh giá nhanh hiện trạng môi trường đất dựa trên quần xã tuyến trùng. Kết quả nghiên cứu tại 5 điểm thu mẫu phân tích được 30 giống tuyến trùng thuộc 6 nhóm dinh dưỡng chính (ăn vi khuẩn, ăn nấm, ăn tảo, ăn tạp, ăn thịt và ký sinh thực vật). Kết quả tính toán các chỉ số ∑MI, ∑MI2-5, MI và PPI cho thấy quần xã tuyến trùng đất ở đây rất ít chịu ảnh hưởng của nhóm ăn vi khuẩn và tỷ lệ hồ tiêu nhiễm ký sinh khá nặng. Phân tích tương quan giữa các nhóm dinh dưỡng cho thấy tuyến trùng khá nhạy cảm với các yếu tố môi trường, điều này cho thấy tiềm năng sử dụng tuyến trùng như một sinh vật chỉ thị cho chất lượng môi trường đất.

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Influence of Asclepias syriaca on soil nematode communities

Folia Oecologica ◽

10.2478/foecol-2021-0009 ◽

2021 ◽

Vol 48 (1) ◽

pp. 73-81

Author(s):

Michaela Jakubcsiková ◽

Andrea Čerevková ◽

Marek Renčo

Keyword(s):

Nematode Species ◽

Parasitic Nematodes ◽

Soil Nematode ◽

Trophic Groups ◽

Asclepias Syriaca ◽

Nematode Communities ◽

Structure Of Communities ◽

Aphelenchus Avenae ◽

The Impact ◽

Soil Nematode Communities

Abstract The main goal of this study was to evaluate the impact of the invasive common milkweed (Asclepias syriaca L.) on soil nematode communities. The research was carried out in 2018 and 2019 in an ecosystem of permanent grassland in the basin of the Laborec River in land registries of Drahňov, a Vojany village in southeastern Slovakia. The ecosystem contained a total of 64 species of free-living and parasitic nematodes. The most prevalent trophic groups were bacterial feeders (Acrobeloides nanus), followed by plant parasites (Helicotylenchus digonicus and Pratylenchus pratensis), fungal feeders (Aphelenchus avenae), and omnivores (Eudorylaimus carteri). The number of nematode species, the composition of trophic groups and the structure of communities in areas with invasive plants were similar to those in areas with native vegetation during the two years of observation.

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Impact of biochar amendment on soil nematode communities in a West African rain-fed rice cropland

Nematology ◽

10.1163/15685411-bja10121 ◽

2021 ◽

pp. 1-12

Author(s):

Segun O. Oladele ◽

Adebayo Adeyemo ◽

Moses Awodun ◽

Ajoke Adegaye ◽

Mariko Ingold

Keyword(s):

Trophic Group ◽

West African ◽

Nematode Population ◽

Available Phosphorus ◽

Soil Nematode ◽

Trophic Groups ◽

Nematode Communities ◽

Study Results ◽

Inorganic Fertiliser ◽

Plant Parasitic

Summary Nematode population and diversity in a West African rain-fed rice cropland amended with biochar (B), biochar plus inorganic fertiliser (B + NPK), inorganic fertiliser (NPK) and control (CK) without amendments were investigated in a 3-year field study. Results demonstrated that significant differences exist between treatments and years of study for total nematode population and nematode trophic groups. Total nematode density, nematode trophic group (bacterivore and plant-parasitic) density were increased and dominant in B + NPK compared with CK after 3 years. Relative abundance of nematode genera according to trophic group across treatments showed Hirschmanniella (23%) as the dominant plant parasites in NPK, and Heterocephalobus (27%), Aphelenchoides (22%) and Eudorylaimus (9%) as dominant bacterivores, fungivores and omnivores-predators, respectively, in B + NPK. Trophic group indicators showed that the fungivore plus bacterivore to plant-parasitic ratio (73%) was significantly increased by B + NPK treatment in comparison to CK. Conversely, treatments exerted no significant effect on the fungivore to bacterivore ratio (F/B) throughout the period of study, which implies less disturbance and adverse impact of biochar on nematode communities. Apart from treatments and environmental factors, changes in nematode trophic groups were strongly related to soil chemical properties, such as soil pH, total nitrogen and available phosphorus, which shows their influence on soil nematode community. Our result shows the positive effect of integrated addition of biochar and inorganic fertiliser in balancing nematode diversity and building a resilient soil ecosystem in a low input rain-fed rice cropping system.

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Long-term effects of a wildfire on the soil nematode communities in the spruce forest ecosystem of High Tatra National Park

International Journal of Wildland Fire ◽

10.1071/wf14138 ◽

2015 ◽

Vol 24 (5) ◽

pp. 702 ◽

Cited By ~ 7

Author(s):

Marek Renčo ◽

Andrea Čerevková

Keyword(s):

Forest Ecosystem ◽

Diversity Index ◽

Control Plot ◽

Parasitic Nematodes ◽

Soil Nematode ◽

Spruce Forest ◽

Long Term Effects ◽

Species Diversity Index ◽

Nematode Communities ◽

Soil Nematode Communities

This study evaluated the effect of a wildfire on soil nematode communities in the spruce forest ecosystem of the High Tatra Mountains 8 years after the fire. Two plots were established, an intact control plot (REF) and a fire-damaged plot after a windstorm (FIR). A total of 20 representative soil samples were collected; 10 from each site (five in June and five in October). A total of 64 species of nematodes were recorded. The mean number of species 8 years after the fire ranged from 24 to 36 and was always significantly higher in REF than in FIR (P < 0.05); with a significantly higher Shannon–Weaver diversity index in REF. Bacterivores were the most abundant trophic group at both sites. Omnivores were more abundant in FIR than in REF, and predators were more abundant in REF. The most abundant species at both sites were Acrobeloides nanus, Aglenchus agricola, Malenchus exiguus and Paratylenchus microdorus. Epidermal or root-hair feeders, mainly Malenchus exiguus, were the most abundant plant-parasitic nematodes at both sites, followed by the ectoparasitic P. microdorus. The migratory endoparasite, Pratylenchus pratensis, was found only in FIR in relatively high numbers, whereas the ectoparasitic species Criconemoides morgensis, Crossonema menzeli and Ogma cobbi occupied only REF. Nematode abundance and species diversity index differed significantly between the disturbed and undisturbed habitats, but ecological and functional indices and metabolic footprints indicate that the soil ecosystem 8 years after the fire had recovered, with moderate levels of nutrient enrichment comparable to those of the control plot.

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Effects of four organic amendments on banana parasitic nematodes and soil nematode communities

Applied Soil Ecology ◽

10.1016/j.apsoil.2011.07.001 ◽

2011 ◽

Vol 49 ◽

pp. 59-67 ◽

Cited By ~ 19

Author(s):

Perrine Tabarant ◽

Cécile Villenave ◽

Jean-Michel Risede ◽

Jean Roger-Estrade ◽

Laurent Thuries ◽

...

Keyword(s):

Organic Amendments ◽

Parasitic Nematodes ◽

Soil Nematode ◽

Nematode Communities ◽

Soil Nematode Communities

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Carbofuran effects in soil nematode communities: Using trait and taxonomic based approaches

Ecotoxicology and Environmental Safety ◽

10.1016/j.ecoenv.2011.07.015 ◽

2011 ◽

Vol 74 (7) ◽

pp. 2002-2012 ◽

Cited By ~ 22

Author(s):

Sónia Chelinho ◽

Klaus Dieter Sautter ◽

Anabela Cachada ◽

Isabel Abrantes ◽

George Brown ◽

...

Keyword(s):

Soil Nematode ◽

Nematode Communities ◽

Soil Nematode Communities

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Soil nematode communities associated with hazelnut orchards in Turkey

Journal of Entomology and Nematology ◽

10.5897/jen2014.0104 ◽

2014 ◽

Vol 6 (8) ◽

pp. 112-121 ◽

Cited By ~ 1

Author(s):

Akyazi Faruk ◽

Yildiz Senol ◽

Firat Felek Anil

Keyword(s):

Soil Nematode ◽

Nematode Communities ◽

Soil Nematode Communities

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Application of PCR-DGGE method for identification of nematode communities in pepper growing soil

Journal of Vietnamese Environment ◽

10.13141/jve.vol7.no1.pp9-14 ◽

2016 ◽

Vol 7 (1) ◽

pp. 9-14

Author(s):

Duong Duc Hieu

Keyword(s):

Maximum Likelihood ◽

Community Sample ◽

Nematode Species ◽

Viet Nam ◽

Soil Nematode ◽

Nematode Communities ◽

Maximum Likelihood Tree ◽

Relationship Of ◽

First Time ◽

Soil Nematode Communities

Soil nematodes play an important role in indication for assessing soil environments and ecosystems. Previous studies of nematode community analyses based on molecular identification have shown to be useful for assessing soil environments. Here we applied PCR-DGGE method for molecular analysisoffive soil nematode communities (designed as S1 to S5) collected from four provinces in Southeastern Vietnam (Binh Duong, Ba Ria Vung Tau, Binh Phuoc and Dong Nai) based on SSU gene. By sequencing DNA bands derived from S5 community sample, our data show 15 species containing soil nematode, other nematode and non-nematode (fungi) species. Genus Meloidogyne was found as abundant one. The genetic relationship of soil nematode species in S5 community were determined by Maximum Likelihood tree re-construction based on SSU gene. This molecular approach is applied for the first time in Vietnam for identification of soil nematode communities. Tuyến trùng đất đóng vai trò chỉ thị quan trọng trong công tác đánh giá môi trường và hệ sinh thái đất. Các nghiên cứu trước đây đã cho thấy lợi ích của việc phân tích cộng đồng tuyến trùng đất bằng định danh sinh học phân tử đối với việc đánh giá môi trường đất. Ở đây, chúng tôi ứng dụng phương pháp PCR-DGGE dựa trên gene SSU để phân tích năm (ký hiệu từ S1 đến S5) cộng đồng tuyến trùng đất thuộc các vùng trồng chuyên canh cây hồ tiêu ở miền nam Việt Nam (Bình Dương, Bà Rịa Vũng Tàu, Bình Phước và Đồng Nai). Bằng cách giải trình tự các vạch của mẫu tuyến trùng S5, kết quả cho thấy cộng đồng tuyến trùng này có 15 loài gồm nhóm tuyến trùng đất, nhóm các loại tuyến trùng khác và nhóm không phải tuyến trùng (nấm) và trong đó Meloidogyne là giống ưu thế. Mối quan hệ di truyền của các các loài tuyến trùng đất thuộc cộng đồng S5 được xác định bằng việc thiết lập cây phát sinh loài Maximum Likelihood dựa trên gene SSU. Đây là nghiên cứu đầu tiên ở Việt Nam sử dụng kỹ thuật PCR-DGGE để phân tích các cộng đồng tuyến trùng đất trồng hồ tiêu.

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Neotyphodium impacts on soil nematode communities: rhizosphere- and litter-mediated interactions

NZGA: Research and Practice Series ◽

10.33584/rps.13.2006.3098 ◽

2007 ◽

Vol 13 ◽

pp. 107-110

Author(s):

M. Omacini ◽

E.J. Chaneton ◽

C.M. Ghersa

Keyword(s):

Plant Traits ◽

Lolium Multiflorum ◽

Fungal Endophytes ◽

Patch Dynamics ◽

Trophic Levels ◽

Soil Nematode ◽

Patch Occupancy ◽

Nematode Communities ◽

Endophyte Infection ◽

Soil Nematode Communities

There is a growing recognition that endophyte effects on host plant traits may be propagated through food chains. We studied Neotyphodium occultans effects on soil nematode communities mediated by current and past patch occupancy by endophyteinfected Lolium multiflorum populations. A microcosm experiment was performed to evaluate whether abundance and diversity of nematodes at different trophic levels were affected by endophyte infection through rhizosphere-mediated or littermediated effects. We found that presence of endophyte-infected plants and their aerial litter both triggered a bottom-up trophic cascade enhancing the abundance of herbivorous and predaceous nematode taxa. Endophyte infection also increased overall nematode richness, mostly through changes induced at the highest trophic level in this soil food web. Our results suggest that fungal endophytes can modify the linkages between aboveand belowground community compartments, with potential consequences on plant patch dynamics. Keywords: soil food webs, Lolium multiflorum, Neotyphodium occultans, plant-soil feedback, after-life effects, indirect interactions, trophic cascades

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