A survey of root knot nematodes and resistance to Meloidogyne incognita in sweet potato varieties from Kenyan fields

Karuri, Hannah; Olago, Daniel; Neilson, Roy; Mararo, Enock; Villinger, Jandouwe

doi:10.1016/j.cropro.2016.10.020

Cited by 59 publications

(37 citation statements)

References 28 publications

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“…Meloidogyne lopezi , closely related to other tropical Meloidogyne species that infect coffee, especially M. arabicida , M. izalcoensis and M. paranaensis , could be differentiated from these species by PCR‐RFLP of the mtDNA COII /16S rRNA (Humphreys‐Pereira et al ., ). A nematode survey of sweet potato fields and cut foliage crops was conducted in Kenya and Florida, respectively, and the mtDNA COII /16S rRNA region was used to determine the distribution and prevalence of Meloidogyne species (Baidoo et al ., ; Karuri et al ., ). Additionally, mtDNA COII /16S rRNA data improved the discrimination sensitivity of RKN species and atypical, non‐identified isolates (Tigano et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Mitochondrial DNA COI was proposed as a molecular marker for DNA barcoding and is capable of discriminating between RKN species more than the rRNA genes (Ahmed et al ., ). Moreover, the mtDNA COII /16S rRNA region has been used in diagnosis and large‐scale regional RKN surveys through PCR and RFLP (Tigano et al ., ; Humphreys‐Pereira et al ., ; Baidoo et al ., ; Karuri et al ., ). Meloidogyne lopezi , closely related to other tropical Meloidogyne species that infect coffee, especially M. arabicida , M. izalcoensis and M. paranaensis , could be differentiated from these species by PCR‐RFLP of the mtDNA COII /16S rRNA (Humphreys‐Pereira et al ., ).…”

Section: Discussionmentioning

confidence: 98%

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Meloidogyne luci, a new root‐knot nematode parasitizing potato in Portugal

et al. 2017

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In 2013, during a field survey conducted in Portugal on potato, Solanum tuberosum, an unusual esterase (EST) phenotype was detected in a root‐knot nematode (RKN) from potato roots collected in Coimbra. This Portuguese isolate was purified and maintained on tomato, S. lycopersicum, and morphological, biochemical and molecular characteristics were studied. Perineal pattern morphology was highly variable, similar to Meloidogyne ethiopica and not useful for identification. The EST phenotype, from young egg‐laying females, displayed three bands similar to the Brazilian M. luci (L3) and distinct from M. ethiopica (E3). Phylogenetic analyses of mitochondrial cytochrome oxidase subunit I and the mitochondrial DNA region between COII and 16S rRNA genes revealed that the Portuguese isolate grouped with M. luci isolates close to M. ethiopica isolates. However, considering the ITS1‐5.8S‐ITS2 region, the Portuguese isolate grouped with isolates of M. luci, M. ethiopica and M. hispanica, which limits the confidence of this region for M. luci diagnosis, and its differentiation from other species with morphological similarities. The M. luci pathogenicity to potato was also assessed in 16 commercial cultivars and compared with M. chitwoodi, considered to be a quarantine RKN species by EPPO. All potato cultivars were susceptible to both Meloidogyne species with gall indices of 5 and higher reproduction factor values ranging from 12.5 to 122.3, which suggests that M. luci may constitute a potential threat to potato production. In the present study, M. luci is reported for the first time attacking potato in Portugal.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 98%

Meloidogyne luci, a new root‐knot nematode parasitizing potato in Portugal

et al. 2017

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“…Root knot nematodes (RKN; Meloidogyne spp.) are ranked as the most economically damaging group of plant parasitic nematodes with a global distribution . The genus Meloidogyne is composed of about 100 species, with M. arenaria , M. incognita , M. hapla and M. javanica being considered the “major” species .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic, thermal analysis, and nematicidal evaluation of new mixed ligand complexes of bidentate Schiff base and 1,10 phenanthroline with some transition metals

El‐Attar

2018

J Chinese Chemical Soc

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Mononuclear Co(II), Cu(II), Y(III), Zr(IV), La(III), and U(VI) complexes of 2‐[(2‐hydroxybenzylidene)‐amino]‐benzoic acid (H2L) ligand in presence of 1,10‐phenanthroline (Phen) were synthesized and characterized by elemental analysis, spectroscopic techniques (IR, UV–vis, and 1H‐NMR), X‐ray powder diffraction and magnetic measurements. The results prove that H2L acts with the mentioned metal salts as a bidentate ON donor ligand and Phen as an NN donor ligand. The calculated bond length and force constant F(UO) in the uranyl complex are 1.732 Å and 708.90 nM−1, respectively. The electronic spectra and the magnetic susceptibility data support the octahedral geometry for the mononuclear Co(II), Y(III), Zr(IV), La(III), and U(VI) complexes and square‐pyramidal geometry for the Cu(II) complex. Thermogravimetric analysis was performed to determine the thermal stability of the synthesized compounds. The kinetic parameters, that is, the activation energy (E*), pre‐exponential factor (A), entropy of activation (ΔS*), enthalpy of activation (ΔH*) and free energy of activation (ΔG*), of the thermal degradation process were evaluated using Coats–Redfern (C–R) and Horowitz–Metzger (H–M) methods for all the complexes, and the best fit results could be obtained. In the present work, all the synthesized complexes showed nematicidal activity against the root knot nematode (Meloidgyne javanica) by inhibiting egg hatching and causing larval mortality of second‐stage juveniles.

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“…Out of the 100 identified Meloidogyne species, 22 occur in Africa, posing a significant threat to crop production by small-holder farmers (Karuri et al, 2017). …”

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confidence: 99%