First Detection of Meloidogyne luci (Nematoda: Meloidogynidae) Parasitizing Potato in the Azores, Portugal

Rusinque, Leidy; Nóbrega, Filomena; Cordeiro, Laura; Serra, Clara; Inácio, Maria L.

doi:10.3390/plants10010099

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…However, host suitability studies carried out in pots have shown that significant economic losses can be predicted due to M. luci (Maleita et al, 2018 , 2022 ; Aydinli et al, 2019 ; Sen and Aydinli, 2021 ). In Portugal, M. luci was found the parasitizing roots of potato ( Solanum tuberosum ), tomato ( S. lycopersicum ), the ornamental plant Cordyline australis , and the weed Oxalis corniculata (Maleita et al, 2018 ; Santos et al, 2019 ; Rusinque et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Juglone and 1,4-Naphthoquinone—Promising Nematicides for Sustainable Control of the Root Knot Nematode Meloidogyne luci

et al. 2022

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The scarce availability of efficient and eco-friendly nematicides to control root-knot nematodes (RKN), Meloidogyne spp., has encouraged research toward the development of bionematicides. Naphthoquinones, juglone (JUG) and 1,4-naphthoquinone (1,4-NTQ), are being explored as alternatives to synthetic nematicides to control RKN. This study expands the knowledge on the effects of these natural compounds toward M. luci life cycle (mortality, hatching, penetration, reproduction). M. luci second-stage juveniles (J2)/eggs were exposed to each compound (250, 150, 100, 50, and 20 ppm) to monitor nematode mortality and hatching during 72 h and 15 days, respectively. Tomato seedlings were then inoculated with 200 J2, which had been exposed to JUG/1,4-NTQ for 3 days. The number of nematodes inside the roots was determined at 3 days after inoculation, and the final population density was assessed at 45 days after inoculation. Moreover, the potential mode of action of JUG/1,4-NTQ was investigated for the first time on RKN, through the assessment of reactive oxygen species (ROS) generation, acetylcholinesterase (AChE) in vitro inhibitory activity and expression analysis of ache and glutathione-S-transferase (gst) genes. 1,4-NTQ was the most active compound, causing ≥50% J2 mortality at 250 ppm, within 24 h. At 20 and 50 ppm, hatching was reduced by ≈50% for both compounds. JUG showed a greater effect on M. luci penetration and reproduction, decreasing infection by ≈80% (50 ppm) on tomato plants. However, 1,4-NTQ-induced generation of ROS and nematode vacuolization was observed. Our study confirms that JUG/1,4-NTQ are promising nematicidal compounds, and new knowledge on their physiological impacts on Meloidogyne was provided to open new avenues for the development of innovative sustainable nematicides.

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Section: Introductionmentioning

confidence: 99%

Juglone and 1,4-Naphthoquinone—Promising Nematicides for Sustainable Control of the Root Knot Nematode Meloidogyne luci

et al. 2022

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“…Plant-parasitic nematodes are harmful organisms and are estimated to cause about USD 173 billion in global yield loss each year [14]. Some plant-parasitic nematode species such as Heterodera glycine, Ditylenchus destructor, and Meloidogyne luci have been reported to seriously affect agricultural production, and the latter two species have developed new hosts [15,16]. Soil nematode abundance and food web indices provide useful information about the soil food web's ecological structure and functions [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Response of Soil Nematode Community Structure and Function to Monocultures of Pumpkin and Melon

Zhao

Wang

Ling

et al. 2022

Life

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It is well known that crop monoculture can induce negative effects on soil ecosystems and crop productivity. However, little is known about how vegetable monoculture affects the soil nematode community structure and its relationship with vegetable yields. In this study, the composition, abundance, metabolic footprint, and ecological indices of soil nematodes are investigated in monocultures of pumpkin and melon. The relationships between nematode community structure and yields of pumpkin and melon were analyzed by linear regression. Both monoculture soils of pumpkin and melon suppressed the relative abundance of bacterivores but increased the relative abundance of plant parasites. Pumpkin monoculture soils decreased soil nematode diversity but increased the maturity index of plant parasites. Monoculture soils of pumpkin and melon decreased the metabolic footprint of lower- and higher-level trophic groups of the soil food web, respectively. Pumpkin and melon monoculture soils increased the food web indices channel index (CI) but decreased the enrichment index (EI) and the structure index (SI). The monoculture soils of pumpkin and melon led to a more fungal-dominated decomposition pathway and degraded soil food web conditions. The abundance of bacterivores and food web indices EI and SI were positively correlated with soil nutrients and pH, while the abundance of plant parasites and CI were negatively correlated with soil nutrients and pH. Paratylenchus was negatively correlated with pumpkin and melon yields and could be the potential plant parasites threatening pumpkin and melon productions. Redundancy analysis showed that monocultures of pumpkin and melon altered the soil nematode community via soil properties; total N, total P, alkeline-N, and pH were the main driving factors.

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“…Currently, the biochemical electrophoretic analysis of nonspecific esterases (EST) is a widely used method employed to differentiate Meloidogyne species, with many species-specific isozyme patterns already published. In Portugal, many species have been reported: Meloidogyne arenaria; M. chitwoodi Golden et al [8][9][10][11][12][13][14]. Due to the risk that various Meloidogyne species pose to agricultural production, a national field survey programme that includes the islands of Azores and Madeira was established in 2019 and led to the detection of M. luci associated with potato in the island of Pico, Azores [14].…”

Section: Introductionmentioning

confidence: 99%

Root-Knot Nematode Species Associated with Horticultural Crops in the Island of Azores, Portugal

Rusinque

Nóbrega

Cordeiro³

et al. 2022

Horticulturae

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Plant-parasitic nematodes (PPN) are an economically important group of plant pests present throughout the world. In particular, root-knot nematodes (RKN), sedentary endoparasites of a wide variety of economically important hosts with the ability to survive in temperate regions. During 2020–2021 an extensive survey of Meloidogyne spp. was undertaken on the island of São Miguel Azores, Portugal. A total of 80 samples comprising 23 species of plants were collected from 13 localities in 4 districts of the island. Samples included field and greenhouse vegetable crops. Bioassays were carried out to obtain females and juveniles for morphological and biochemical characterization of the isolates. The observed morphological features showed high similarity and consistency with previous descriptions of the genus. Concerning the biochemical characterization, the esterase (EST) phenotype displayed the patterns described for M. incognita, M. arenaria, and M. javanica. Meloidogyne incognita was found to be the most prevalent species with respect to both natural host range and geographical distribution, followed by M. arenaria and M. javanica. This is the first field survey that assesses the species of root-knot nematodes associated with horticultural crops in the Azores Island, contributing additional information on the distribution of this genus.

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First Detection of Meloidogyne luci (Nematoda: Meloidogynidae) Parasitizing Potato in the Azores, Portugal

Cited by 12 publications

References 15 publications

Juglone and 1,4-Naphthoquinone—Promising Nematicides for Sustainable Control of the Root Knot Nematode Meloidogyne luci

Juglone and 1,4-Naphthoquinone—Promising Nematicides for Sustainable Control of the Root Knot Nematode Meloidogyne luci

Response of Soil Nematode Community Structure and Function to Monocultures of Pumpkin and Melon

Root-Knot Nematode Species Associated with Horticultural Crops in the Island of Azores, Portugal

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