| the structure of syncytia induced by the phytoparasitic nematode nacobbus aberrans in tomato roots, and the possible role of plasmodesmata in their nutrition. | the structure of syncytia induced within galls in tomato roots by the false root-knot nematode nacobbus aberrans has been examined by light and electron microscopy. a syncytium develops by breakdown or individual cell walls, which allows movement of cytoplasmic contents between transformed cells. the wall breakdown takes place at pit fields, where the plasmodesmata may be protected from digestion until the surrounding wall is removed. numerous sieve elements differentiate in the cells outside th ... | 1994 | 197113 |
| top 10 plant-parasitic nematodes in molecular plant pathology. | the aim of this review was to undertake a survey of researchers working with plant-parasitic nematodes in order to determine a 'top 10' list of these pathogens based on scientific and economic importance. any such list will not be definitive as economic importance will vary depending on the region of the world in which a researcher is based. however, care was taken to include researchers from as many parts of the world as possible when carrying out the survey. the top 10 list emerging from the s ... | 2013 | 23809086 |
| relationship between heterodera schachtii, meloidogyne hapla, and nacobbus aberrans on sugarbeet. | heterodera schachtii, meloidogyne hapla, and nacobbus aberrans either alone, or in various combinations with each other, can, when inoculated at a concentration of 12 second-stage juveniles/ cm(3) of soil, cause a significant (p = 0.01) suppression of growth of sugarbeet (cv. tasco ah14) seedlings. m. hapla and h. schachtii decreased growth of sugarbeet more than n. aberrans over a 60-day period. the adverse effect of n. aberrans on the final population/initial population (pf/pi) ratio for eithe ... | 1984 | 19295890 |
| phylogenetic analysis of nematodes of the genus pratylenchus using nuclear 26s rdna. | we used nucleotide sequences of the large subunit ribosomal genes (26s rdna) to examine evolutionary relationships among species of the genus pratylenchus (order: tylenchida, family: pratylenchidae), commonly known as root-lesion nematodes. ten species of pratylenchus were studied including, p. penetrans, p. crenatus, p. minyus, p. vulnus, p. thornei, p. musicola, p. coffeae, p. hexincisus, p. scribneri, and p. brachyurus. the species hirschmanniella belli, meloidogyne javanica, heterorhabditis ... | 1997 | 9007024 |
| the transcriptome of nacobbus aberrans reveals insights into the evolution of sedentary endoparasitism in plant-parasitic nematodes. | within the phylum nematoda, plant-parasitism is hypothesized to have arisen independently on at least four occasions. the most economically damaging plant-parasitic nematode species, and consequently the most widely studied, are those that feed as they migrate destructively through host roots causing necrotic lesions (migratory endoparasites) and those that modify host root tissue to create a nutrient sink from which they feed (sedentary endoparasites). the false root-knot nematode nacobbus aber ... | 2014 | 25123114 |
| genetic variation in nacobbus aberrans: an approach toward taxonomic resolution. | biochemical and molecular analyses of genetic variation were evaluated to address the taxonomic status of nacobbus aberrans. isolates from mexico, peru, and argentina, cultured on tomato in the greenhouse, were analyzed with respect to isozyme and dna marker variation. although acid phosphatase and malate dehydrogenase revealed distinct profiles for each isolate, non-specific esterases revealed possible affinities between the peruvian isolates and between the isolates from mexico and peru. two o ... | 1997 | 19274155 |
| influence of nacobbus aberrans densities on growth of sugarbeet and kochia in pots. | | 1984 | 19294044 |
| development of the false root-knot nematode, nacobbus aberrans, on sugarbeet. | the duration of the embryogenic development of nacobbus aberrans (= n. batatiformis) took 9-10 days at 25 c and 51 days at 15 c. the j molted in the egg; hence the je emerged from the egg. the effect of distilled water attd root leachates of kochia and sugarbeet was investigated at 5, 10, 15, 20, and 25 c. root leachates did not significantly affect the percent of cumulative hatch of eggs, but temperature did significantly affect emergence of juveniles (p = 0.05). less than 1, 5, and 20% of eggs ... | 1983 | 19295804 |
| solanum tuber-bearing species resistance behavior against nacobbus aberrans. | naccobus aberrans is a major pest of the potato crop in the andean regions of argentina, bolivia, and perú. it is endemic in northwest argentina and is also found in lowlands. the resistance of eleven andean potato landraces and three accessions of the wild tuber-bearing species solanum acaule, s. infundibuliforme, and s. megistacrolobum were evaluated against a population of n. aberrans from coctaca, jujuy province, while solanum tuberosum ssp. tuberosum 'spunta', 'kennebec', and 'frital inta' ... | 2009 | 22661771 |
| diagnosis and molecular variability of an argentinean population of nacobbus aberrans with some observations on histopathology in tomato. | diagnosis of an argentinean population of nacobbus sp. infecting sweet pepper (lamuyo) was carried out including morphology, scanning electron microscopy, and molecular studies. in light of our morphometric, molecular and host-range results, we consider the studied population to belong to n. aberrans s. l., and by host range tests the population is assigned to the "sugar beet group." its-pcr analysis on individual male and immature female specimens of this population yielded amplification produc ... | 2007 | 19259470 |
| changes in esophageal gland activity during the life cycle of nacobbus aberrans (nemata: pratylenchidae). | electron and light microscopy were used to study the dorsal gland (dg) and the two subventral glands (svg) of seven developmental phases of nacobbus aberrans: pre-parasitic second-stage juveniles (j2), parasitic j2, third- (j3) and fourth- (j4) stages, migratory females, young sedentary females, and mature sedentary females. in each developmental phase the level of esophageal gland activity, was estimated by the abundance of organelles associated with secretory pathways, including endoplasmic re ... | 1998 | 19274221 |
| revision of the genus nacobbus thorne and allen, 1944 (nematoda: tylenchoidea). | all four species and one subspecies of the genus nacobbus thorne and allen, 1944 were studied and measured from type specimens. nacobbus batatiformis thorne and schuster, 1956; n. serendipiticus franklin, 1959; and n. serendipiticus bolivianus lordello, zamith and boock, 1961 are proposed as synonyms of n. aberrans (thorne, 1935) tborne and allen, 1944. nacobbus aberrans is distinguished from the type species n. dorsalis thcrne and allen, 1944 by the larger number of body annules between the vul ... | 1970 | 19322302 |