Physiology of Nematodes

Lee, D. L.; Atkinson, H.J.

doi:10.1007/978-1-349-02667-8

Cited by 108 publications

(77 citation statements)

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“…In this study, about 30% of J2 continued to be vermiform on the root cortex and were incapable of inducing formation of giant cells. This can be explained because the body energy of the J2, principally the lipid content accumulated during embryonic development (Lee & Atkinson, 1977), makes it possible to penetrate but not establish a feeding site.…”

Section: Discussionmentioning

confidence: 99%

Defense responses to Meloidogyne exigua in resistant coffee cultivar and non-host plant

Silva¹,

Oliveira²,

Ferreira³

et al. 2013

Trop. plant pathol.

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The resistance of coffee plants to Meloidogyne exigua is conferred by the gene Mex-1. However, the mechanisms of resistance still need to be clarified. Therefore, the penetration, development and reproduction of two populations of M. exigua (M1, isolated from the coffee plant and M2, from rubber tree) in susceptible (Coffea arabica 'Catuai') and resistant (C. canephora 'Apoatã') cultivars were studied. A greater quantity of J2 from M1 penetrated the susceptible cultivar, but there was no difference between the cultivars for M2. Although the resistant coffee cultivar formed some galls, the nematode did not reproduce. M2 did not induce the formation of galls or the production of eggs in either cultivars. Events related to hypersensitive reaction (HR) were observed as well as other defense responses of the coffee cultivar against M. exigua, which inhibited the formation of the feeding site, provoked emigration of the J2 and delayed or inhibited development and reproduction. The response of the non-host plant was more effective, because it did not allow development of the nematode or, consequently, its reproduction. It was concluded that the coffee cultivar's resistance to M. exigua is not restricted to HR, but rather to a set of defense responses, both constitutive and induced, expressed after nematode penetration, especially phenolic-like compounds.

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Section: Discussionmentioning

confidence: 99%

Defense responses to Meloidogyne exigua in resistant coffee cultivar and non-host plant

Silva¹,

Oliveira²,

Ferreira³

et al. 2013

Trop. plant pathol.

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“…Esta característica se debe al hecho de que requieren utilizar el material nutritivo de las plantas, para lo cual sintetizan celulasas aparentemente a nivel de la faringe. Este proceso no es requerido por los nematodos de animales, dado que éstos se nutren directamente del animal hospedero y no del contenido digestivo, para lo cual poseen dientes, a diferencia de los fitonematodos que poseen estiletes (Lee 1965, Tracery 1958. Esta característica anatómica de los nematodos sugiere evaluar el efecto parasitario sobre el animal dado el efecto expoliatriz que sobre la mucosa ejercen para alimentarse (Quiroz 1984).…”

Section: Discussionunclassified

Contenido de alimento y metabolismo ceco-cólico en el tracto digestivo de poblaciones silvestres de iguana negra (Ctenosaura pectinata) en Morelos, México

Vélez-Hernández

Cobos-Peralta²,

Arcos-García

2012

Arch. med. vet.

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ARTÍCULO ORIGINAL Contenido de alimento y metabolismo ceco-cólico en el tracto digestivo de poblaciones silvestres de iguana negra (Ctenosaura pectinata) en Morelos, MéxicoCecum-colic content of food and metabolism in the digestive tract of wild population black lizard (Ctenosaura pectinata) in Morelos, Mexico SUMMARYFive digestive tracts of black lizards (Ctenosaura pectinata) from a wild population were collected in Morelos State, México, in order to identify the plant composition in the diet and the cecum-colic metabolism. Smears obtained from cecum-colic content were observed to register the presence of protozoa, bacteria and intestinal parasites. The average and standard deviation were estimated from the evaluated characteristics. The plants species Guamúchil (Phitecellobium dulce) and Huizache (Acacia farnesiana) were identified in the cecum-colic content. The vegetal content of the diet was constituted by fruits (62.9%), leaves (30.6%), buds (2.9%) and flowers (3.5%), dry matter basis. The cecum-colic portion was characterised by the concentration (mmol) of acetic (68.9 ± 10.6), butyric (11.98 ± 5.7) and propionic (9.04 ± 1.5) fatty acids, total fatty acids (89.9 ± 15), pH 7.45, and ammonia nitrogen concentration (7.4 ± 2.8 mg/dl). The microbiotic observed was the Nyctotherus spp protozoa. The total bacterial count ranged from 7 x 10 8 to 9 x 10 9 /g, cellulolytic bacteria ranged from 9.2 x 10 7 to 3.5 x 10 8 /g of cecal content. The parasites observed were nematodes identified as members of the Oxyuroidea superfamily, with 655 ± 265 eggs/g and 6,300 ± 329 adults/lizard. It is concluded that the fermentation of the cecum-colon region of the adult black iguana behaves similarly to that from herbivorous species, with fermentation being carried out according to the ingested food. Dietary concentration of crude protein was 14.5% and energy 2.193 (Mcal/kg), and they are animals parasited by oxiurids.Palabras clave: Ctenosaura pectinata, parásitos, metabolismo, tracto digestivo.

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“…The highest glycogen and protein contents of the females may be accounted for due to the high fecundity and their additlonal storage in the eggs and ovaries which has been confirmed histochemically (8hatnagar 1985). Lee, Atkinson (1976) have, ho~ever, described differences in the percentage protein content of nematodes due partly to variation in the amounts of carbohydrate and lipid in the tissues and have pointed out that ovary of nematodes contains a significant amount of protein ~hich contributes in the formation of egg shell. Difference in protein "content in male (64~7J), female (62.46) and L1 (47.71), in per cent of dry ~eight have been reported (K u m a"r 1984) in B. trigonocephalum.…”

Section: Discussionmentioning

confidence: 99%

Gross Chemical Composition of the Two Sexes and Juveniles of Trichuris ovis

Kumar¹

1987

Acta Vet. Brno

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K u mar S.: Gross Chemical C~ition of the Tw Sexes and Juveniles of Trichuris ovis. Acta vet. Brno, 56, 1987: 297-303. Gross chemical composition (glycogen; lipid -total body, phospholipid, unsaponifiable; protein and nucleic acids -DNA and RNA) of males, females and free-living infective juvenile stages of Trichuris ovis has been worked out on dry weight basis. Marked qu,ntitative differences were found. to exist in per cent of the biochemical constituents in between the two sexes as well as between the adult and the juvenile stages.

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Physiology of Nematodes

Cited by 108 publications

References 0 publications

Defense responses to Meloidogyne exigua in resistant coffee cultivar and non-host plant

Defense responses to Meloidogyne exigua in resistant coffee cultivar and non-host plant

Contenido de alimento y metabolismo ceco-cólico en el tracto digestivo de poblaciones silvestres de iguana negra (Ctenosaura pectinata) en Morelos, México

Gross Chemical Composition of the Two Sexes and Juveniles of Trichuris ovis

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