| cytogenetic status of meloidogyne (hypsoperine) spartinae in relation to other meloidogyne species. | four populations of meloidogyne spartinae from the coast of north and south carolina were identical cytogenetically. fourteen rod-shaped chromosomes were present in oogonia and spermatogonia, whereas seven bivalents were observed in oocytes and spermatocytes. there were no distinguishable sex chromosomes. chromosome behavior was similar to that of other meloidogyne species. a slight deviation in morphology of prometaphase bivalents was attributed to an increase in frequency of chiasmata that may ... | 1987 | 19290099 |
| inflorescence and leaf galls on palisota barteri caused by meloidogyne javanica. | | 1986 | 19294231 |
| varietal response and estimates of heritability of resistance to meloidogyne javanica in carrots. | with methods developed in this study, varietal responses to m. javanica were evaluated and heritability of resistance of two promising carrot cultivars was estimated. more egg masses were found on root systems inoculated with eggs added to the soil in three holes in 250 cm(3) cups than by mixing the inoculum with soil in the cups. a resistant breeding line, cnph 1437, was discriminated from susceptible cultivar nova kuroda with inoculum levels higher than 2,000 eggs per cup. greenhouse and field ... | 1986 | 19294218 |
| penetration, development, reproduction, and sex ratio of meloidogyne javanica in three carrot cultivars. | | 1986 | 19294200 |
| species-specific restriction site polymorphism in root-knot nematode mitochondrial dna. | research was initiated to physically characterize the mitochondrial genomes of several meloidogyne spp. and host-races, to address questions regarding their systematics and dispersal, and to assess the possibility of developing molecular diagnostics for these nematodes. techniques were developed for purification and rapid detection of mitochondrial dna from root-knot nematodes. mitochondrial dnas among meloidogyne spp. were demonstrated to exhibit extensive divergence. the potential for using th ... | 1986 | 19294180 |
| effects of hydroxyurea on the ultrastructure of giant cells in galls induced by meloidogyne javanica. | hydroxyurea (hu) at concentrations of 10 or 20 mg/liter was included in a medium on which excised tomato roots infected with the root-knot nematode meloidogyne javanica were grown. in the hu, treated roots, giant cells were small and contained large vacuoles. giant cell nuclei were amoeboidal with relatively small nucleoli in treated roots, compared with giant cells of nontreated galls. in treated-root giant cells, the cytoplasm was diffuse and few organelles such as mitochondria, dictyosomes, a ... | 1986 | 19294137 |
| effect of inhibitors and stimulators of ethylene production on gall development in meloidogyne javanica-infected tomato roots. | excised tomato roots infected with meloidogyne javanica produced ethylene at 3-6 times the rate of noninfected roots. this increase in ethylene production started 5 days after inoculation. gall growth and ethylene production in infected roots were accelerated by 1-aminocyclopropane-1-carboxylic acid (acc), indole acetic acid (iaa), and ethrel known as ethylene production stimulators. when inhibitors of ethylene production, like aminoethoxyvinylglycine (avg) or aminoxyacetic acid (aoa), or inhibi ... | 1985 | 19294073 |
| ethylene production by meloidogyne spp.-infected plants. | gall size and rates of ethylene production by various hosts infected with meloidogyne javanica and by excised tomato root cultures infected with m. javanica or m. hapla were measured. infection with m. javanica increased the rate of ethylene production in dicotyledonous plants (cabbage, pea, carrot, cucumber, carnation, and tomato), but not in infected monocotyledonous plants (corn, wheat, and onion). nematode infection induced large galls on roots of dicotyledonous, but not monocotyledonous, pl ... | 1985 | 19294059 |
| an induced resistance effect of hydroxyurea on plants infected by meloidogyne javanica. | aqueous solutions of hydroxyurea (hu) in various concentrations were applied as soil drenches to meloidogyne javanica-infected plants. at a concentration of 15 ppm, the chemical hampered giant cell formation and the number of females on the roots was 20% of that of the control but the growth of the host plants was not affected. additional hu applications after the one at infection did not add to the inhibitory effect. hu exerted its effect on m. javanica-infected tomato in five soil types. soil ... | 1985 | 19294052 |
| cropping effects of marigolds, corn, and okra on population levels of meloidogyne javanica and on carrot yields. | | 1984 | 19294045 |
| influence of nacobbus aberrans densities on growth of sugarbeet and kochia in pots. | | 1984 | 19294044 |
| a new pathotype of root-knot nematode on grape rootstocks. | | 1984 | 19295902 |
| influence of urea, hydroxyurea, and thiourea on meloidogyne javanica and infected excised tomato roots in culture. | urea (u), hydroxyurea (hu), and thiourea (tu), in various concentrations, were added to chemically defined plant tissue culture medium on which meloidogyne javanica was reared on excised tomato roots. concentrations as low as 3 ppm hu or 12 ppm tu inhibited nematode maturation by 70-90% 4 weeks after inoculation, and the coenocytes in the parasitized tissue were poorly developed. gall weight was also inhibited by 50% in cultures treated with 3 and 6 ppm hu. however, exposing juveniles of m. java ... | 1984 | 19295888 |
| influence of six vegetable cultivars on reproduction of meloidogyne javanica. | replicated field and greenhouse experiments were used to evaluate the effect of tomato, cabbage, cucumber, carrot, amaranthus hybridus, and pepper on growth and fecundity of meloidogyne spp., particularly m. javanica. in the field tests, tomato, cucumber, and carrot favored population increases of meloidogyne spp., while amaranthus, pepper, and cabbage limited them. some cropping sequences that included crops from the latter group had a suppressive effect on population growth. thus, of the 36 cr ... | 1983 | 19295847 |
| interrelationships between ethylene production, gall formation, and root-knot nematode development in tomato plants infected with meloidogyne javanica. | ethylene production was determined in excised tomato (lycopersicon esculentum) root cultures of meloidogyne javanica susceptible and resistant cultivars infected with m. javanica. uninfected cultivars produced very low amounts of ethylene. relatively high amounts of ethylene were produced by the infected susceptible cultivars. peak production of 1.6 n moles * g root(1) * h(1) occurred between 9 and 16 days after inoculation (dai). the period of high ethylene production coincided with that of rap ... | 1983 | 19295844 |
| meloidogyne aquatilis n. sp (nematoda:meloidogynidae) from spartina pectinata with a key to the canadian species of meloidogyne. | a new root-knot nematode, meloidogyne aquatilis n. sp., attacking the roots of spartina pectinata link growing in the ottawa river is described and illustrated. meloidogyne aquatilis is distinguished from m. graminis by the light brown body color and by the absence of perineal lateral fields in the female. the male differs by the shorter stylet and by the hemizonid being separated by 7-9 annules from the excretory pore. the second-stage juveniles are also recognized by the 7-9-annule gap between ... | 1983 | 19295816 |
| 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 |
| effect of soil water potential on survival of meloidogyne javanica in fallow soil. | a natural infestation of meloidogyne javanica in an aggregated oxisol declined at an exponential rate when aliquots of the soil were stored for 72 days in polyethylene bags at various soil water potentials (psi). time periods required for reduction in soil infestations by 50% were 2.7, 4.9, 110, 10, and 2.6 days at psi of -0.16, -0.30, -1.1, -15, and -92 bars, respectively. in the wetter soils, at psi of -0.16, -0.30, and -1.1 bars, the predominant stage recovered was the second-stage larva. in ... | 1983 | 19295774 |
| isozyme monitoring of genetic variation in lycopersicon. | linkages with isozymic loci facilitate the investigation of certain classes of genetic variation. due to the mapping of 20 isozymic loci on nine of the 12 chromosomes of the cultivated tomato (lycopersicon esculentum), much progress has been made in these applications, particularly in the analysis of interspecific hybrids. isozymes can expedite the selective elimination of inferior wild parent germ plasm in backcross transfer of desired genes to the cultivated parent. allelic isozyme constitutio ... | 1983 | 6642990 |
| influence of potassium and nitrogen fertilization on parasitism by the root-knot nematode meloidogyne javanica. | the influence of various c oncentrations of k, nitrogen sources, and inoculation with root-knot nematode meloidogyne javanica were evaluated in tomato plants. increased potassium concentration increased top and root fresh weights of intact plants and fresh weights of excised roots. nitrate-fertilized plants weighed more than plants receiving ammonium independent of the k level in the medium. nematode counts on roots were not affected by nutritional differences in intact or excised roots. in inta ... | 1982 | 19295748 |
| lectin binding to meloidogyne javanica eggs. | | 1982 | 19295730 |
| post-infection development and morphology of meloidogyne cruciani. | the development and life stages of meloidogyne cruciani on tomato was studied at 28 c. roots of 2-wk-old 'rutgers' tomato seedlings were exposed to inoculum for 24 h, rinsed, and the seedlings repotted. no major changes in juvenile development were observed prior to 8 days after inoculation. at 11 days the second-stage juvenile had enlarged considerably. the genital primordium had not yet asumed the v-shape characteristic of developing females, but the presence of rectal glands identified the ju ... | 1982 | 19295716 |
| description of the blueberry root-knot nematode, meloidogyne carolinensis n. sp. | meloidogyne carolinensis n. sp. is described from cultivated highbush blueberry (cultivars derived from hybrids of vaccinium corymbosum l. and v. lamarckii camp) in north carolina. the perineal pattern of the female has a large cuticular ridge that surrounds the perivulval area, and the excretory pore is near the level of the base of the stylet. the stylet is 15.9 mum long and the knobs gradually merge with the shaft. the head shape and stylet morphology of the male are quite variable. the typic ... | 1982 | 19295713 |
| three new species of heteroderoidea (nematoda) from the aleutian islands. | three new species of heteroderoidea are described from adak and amchitka islands in the aleutian chain. second-stage juveniles of thecavermiculatus crassicrustata, n. sp., differ from those of t. gracililancea robbins by having longer stylets (40-45 mum vs 19-22 mum). the female of t. crassicrustata has a longer neck, a more posterior excretory pore, and lacks a posterior protuberance. meloidodera eurytyla, n. sp., differs from other meloidodera spp. in that second-stage juveniles have longer st ... | 1981 | 19300796 |
| diacyl, alkylacyl, and alkenylacyl phospholipids of meloidogyne javanica females. | the phospholipid composition and acyl, alkyl, and alkenyl group compositions of diacyl, alkylacyl, and alkenylacyl phosphoglycerides of m. javanica were investigated. phospholipid was comprised of 61.7% choline phosphoglyceride, 22.0% ethanolamine phosphoglyceride, and smaller quantities of six other lipids. phospholipid fatty acid was more unsaturated than neutral lipid fatty acid and contained 61.3% octadecenoic (18:1) acid. fatty acid at the 1-position of diacyl phospholipids was shorter and ... | 1981 | 19300731 |
| physiology of parasites: transaminases (got and gpt) in the root-knot nematode, meloidogyne lucknowica singh 1969, and effect of sex on its enzyme levels. | the glutamic-pyruvic transaminase (gpt) activity was found to be greater than the glutamicoxalacetic transaminase (got) activity in the mixed as well as in separate sexes of m. lucknowica. the sexual differences were 44.26% in got levels and 41.8% in gpt levels of the two sexes of the parasite, and the females showed higher enzymatic activity than their males. | 1980 | 7424217 |
| partial characterization of the cuticle surface of meloidogyne javanica females. | negative charges on the outer cuticular surface of meloidogyne javanica females were visualized with electron microscope labelling techniques. evidence is presented that the electronegative charge is not borne on neuraminic acid. ruthenium red staining indicated acid mucopolysaccharides on the outer surface. a surface coat, or glycocalyx, external to the outer cuticle membrane was demonstrated. | 1979 | 19300656 |
| effects of aldicarb on fusarium wilt-root-knot nematode disease of cotton. | | 1978 | 19305871 |
| evaluation of the protective and therapeutic properties of dbcp for control of root-knot nematode on tomato. | twelve soil drenches over a period of 30 days with dbcp concentrations of 40 microg/ml did not completely prevent infection of tomato plants by root-knot nematode juveniles. repeated dbcp drenches of 40 microg/ml halted gall development during the drenches, but 10 days after drenching was discontinued galls were apparent. dbcp drenches at 200 microg/ml prevented tomato root development, and 40 microg/ml slowed it. ten microg/ml increased the height of root-knot-infected plants, but not their top ... | 1978 | 19305858 |
| the effect of diflubenzuron on egg formation by the root-knot nematode. | | 1978 | 19305842 |
| ultrastructure of a neurosensory organ in a root-knot nematode. | | 1976 | 957473 |
| life cycle, pathogenicity, histopathology, and host range of race 5 of the barley root-knot nematode. | the optimum temperature for development of race 5 of meloidogyne naasi was 26 c. a life cycle was completed in 34 days. growth of sorghum was suppressed when inoculated with m. naasi. observations of m. naasi-infected sorghum roots demonstrated that roots were penetrated just behind the root cap; giant cells were generally initiated either in the procambial region or in very young phloem. when giant cells developed in the cortex, corresponding areas of the vascular system did not have an endoder ... | 1976 | 19308227 |
| the incorporation of photosynthates by meloidogyne javanica. | the root-knot nematode, meloidogyne javanica, incorporated (1)c from its host after exposure of the plant to (1)co. this uptake was relatively slow and was not detected in nematodes exposed to a labelled plant for periods of 2 and 4 h, but was after 24 h. nematodes were grown in plants previously infected at weekly intervals to provide animals at various stages of growth. plants were harvested 24 h after exposure to the label and the rate of incorporation per unit area of nematode was measured. ... | 1975 | 19308142 |
| suppression of embryogenesis and hatching in meloidogyne javanica by thermal stress. | embryogenes is and hatching of eggs of meloidogyne javanica were suppressed by brief heat treatment (46 c for 10 min). the period of suppression or arrested development differs according to the stage of development of the nematode when heat treatment is applied. the effect on hatching is much more pronounced than on embryogenesis. | 1974 | 19319374 |
| efficacy of 1,2-dibromo-3-chloropropane for control of meloidogyne javanica as influenced by concentration, exposure time and rate of degradation. | laboratory experiments were conducted by applying 1,2-dibromo-3-chloropropane (dbcp) to sealed vials of soil infested with meloidogyne javanica. a minimum initial concentration of 0.25 mug of dbcp/g of oven-dry soil killed all nematodes within 35 days. a concentration of 1.0 mug/g killed all nematodes within 28 days. the rate of degradation of this chemical was determined by treatment of steamed and nonsteamed dry soil in open and sealed vials. extraction of tile chemical, followed by quantifica ... | 1973 | 19319345 |
| the effects of soil salinity and meloidogyne javanica on tomato. | a non-sodic, non-saline sandy loam soil was salinized to anion-cation ratios similar to those naturally occurring in iraq and california. the interactions of saline soils (conductivities 4, 8, 12 and 16 mmhos/cm) with a moderately salt-tolerant plant (lycopersicon esculentum 'marimond') and a plant parasitic nematode (meloidogyne javanica) were investigated. plant parasitic nematodes were shown to be an important modifying influence within the plant environment, either accentuating or ameliorati ... | 1973 | 19319341 |
| economics of root-knot nematode control on cotton by dbcp fumigant on the texas high plains. | | 1973 | 19319302 |
| races of the barley root-knot nematode, meloidogyne naasi. iii. reproduction and pathogenicity on creeping bentgrass. | reproduction and pathogenicity of the five known races of meloidogyne naasi on two selections of creeping bentgrass were compared. toronto c-15 was a host for races 3, 4 and 5, whereas northmoor 9 supported reproduction of all five races. differences in susceptibility and population increase demonstrated that the races could be separated by degree of reproduction on the two selections. root weights generally were unaffected. based on cumulative dipping weights, all but race 1 were pathogenic on ... | 1973 | 19319296 |
| races of the barley root-knot nematode, meloidogyne naasi. ii. developmental rates. | the developmental rates of the five newly designated races of meloidogyne naasi were compared on barley, oat and sorghum. races 1, 2, 3 and 4 developed and reproduced on both barley and oat but not on sorghum. race 5 developed and reproduced readily on sorghum but poorly on oat. a more rapid rate of development of race 5 on both barley and sorghum than that of other races on barley demonstrated that race 5 has a shorter life cycle than do races 1-4. | 1973 | 19319295 |
| races of the barley root-knot nematode, meloidogyne naasi. i. characterization by host preference. | the host preferences of populations of meloidogyne naasi from england, california, illinois, kentucky and kansas were compared. among 22 plant species tested, most were hosts for isolates of all five populations; crabgrass was added to the list of known hosts. differential reactions of isolates on creeping bentgrass, curly dock, sorghum, and common chickweed demonstrated the existence of at least five physiological races within m. naasi. the known races are numerically designated and characteriz ... | 1973 | 19319294 |
| effects of meloidogyne javanica and incognita on the amino acid and reducing sugar content of certain soybean varieties. | | 1973 | 4740805 |
| influence of temperature on embryogenesis in meloidogyne javanica. | the optimum temperature for embryogenesis in meloidogyne javanica lies between 25 and 30 c. embryogenesis is slightly more rapid at 30 c (9-10 days), but more eggs complete development at 25 c (11-13 days). at temperatures of 25, 27.5, and 30 c, embryogenesis is about twice as rapid as at 20 c (23-25 days), and about four times as rapid as at 15 c (46-48 days). time-lapse studies showed that the thermal optimum is similar throughout the different stages of embryonic development. | 1972 | 19319268 |
| changes in the ultrastructure of the gelatinous matrix of meloidogyne javanica during dehydration. | the fine structure of the gelatinous matrix of meloidogyne javanica in both moist and dry states was studied by means of chemical fixation and thin sectioning techniques and the freeze-etch method. the matrix consists of an irregular meshwork when hydrated and a uniform granular mass of much greater density when dehydrated. the spaces in the hydrated meshwork are presumed to contain water. the change from a hydrated to a dehydrated state is accompanied by an overall shrinkage and hardening of th ... | 1972 | 19319261 |
| influence of six varieties of cynodon on four meloidogyne spp. | two years of giant star grass, cynodon nlemluensis var. nlemfuensis, in a field plot markedly reduced the incidence of the root-knot nematodes. tomato planted following the grass showed very little or no root galling and the yield was thrice that of tomato planted on an adjacent field plot previously cropped to tomato. replicated greenhouse experiments indicated that six varieties of cynodon were resistant to root-knot nematode but it took up to 6 months of grass growth to appreciably lower the ... | 1971 | 19322377 |
| histopathogenesis of galls induced by meloidogyne naasi in wheat roots. | histopathogenesis of galls induced by meloidogyne naasi in wheat roots was studied. large numbers of larvae penetrated wheat root tips within 24 hr; larvae migrated both inter- and intracellularly, causing cortical hypertrophy. giant cells were formed in the stele around the head of each nematode within 4 to 5 days. initial pathological alterations in giant cell formation consisted of hypertrophy of protophloem and protoxylem cells, their nuclei and nucleoli. giant ceils contained 2 to 8 agglome ... | 1970 | 19322304 |
| pathogenicity of four root-knot nematode species to polianthes tuberosa. | | 1970 | 19322296 |
| wall modifications in developing giant cells of vicia faba and cucumis sativus induced by root knot nematode, meloidogyne javanica. | | 1969 | 5799564 |
| pathogenicity of four species of meloidogyne on three varieties of olive trees. | 'ascolano' and 'sevillano' olive trees, olea europaea l., were highly susceptible to meloidogyne javanica (trueb) chitwood, and growth of their tops was decreased greatly in tests in a glasshouse. roots of 'manzanillo' olive trees were galled moderately by m. javanica, and their tops weighed 6% less than those of noninoculated trees. 'manzanillo' olive is considered highly tolerant to m. javanica. 'ascolano' and 'manzanillo' olive trees were highly susceptible to m. incognita (kofoid &white) chi ... | 1969 | 19325664 |
| supply of oxygen during hatching of the nematode meloidogyne javanica under non-competitive conditions. | | 1968 | 5689347 |
| changes associated with parasitism in nematodes. ii. histochemical and microspectrophotometric analyses of preparasitic and parasitic larvae of meloidogyne javanica. | | 1967 | 4294954 |
| activity of dehydrogenases in tomato root-knots infected with the root-knot nematode. | | 1967 | 5583868 |
| changes associated with parasitism in nematodes. i. morphology and physiology of preparasitic and parasitic larvae of meloidogyne javanica. | | 1967 | 5340778 |
| host-parasite interaction in root-knot nematode-infected carrot tissue. | | 1965 | 14288718 |
| influence of soil oxygen concentrations on the development of meloidogyne javanica. | roots of tomato plants infected with meloidogyne javanica were grown in soil subjected to oxygen concentrations of 21 percent, 5.5 percent, 3.5 percent, 2.0 percent, 0.6 percent, and 0 percent for 28 and 35 days. the lowest oxygen tension which still allowed development of the host and the nematode was 3.5 percent. below this level the plant root growth, size of developing females, and production of nematode eggs were reduced. nematode activity as measured bythe number of nematode galls on the r ... | 1961 | 17731377 |
| meloidogyne acronea, a new species of root-knot nematode. | | 1956 | 13321999 |
| notes on the physiology of meloidogyne javanica (treub, 1885), nematoda: heteroderidae. | | 1951 | 14825030 |
| the relative susceptibility of 41 sweetpotato varieties, introductions, and seedlings to the root-knot nematode, heterodera marioni (cornu) goodey. | | 1947 | 20296033 |
| host-parasite relationships of the root-knot nematode, heterodera marioni; some effects of the host on the parasite. | | 1946 | 21027516 |