Chemical Signals in the Plant—Nematode Interaction

Gheysen, Godelieve

doi:10.1007/978-1-4615-5329-8_6

Cited by 9 publications

(4 citation statements)

References 91 publications

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“…Attraction or repellency of host plants to nematodes has been the subject of several investigations (46,119), but only a few host-or nonhost-specific compounds mediating this attraction are known. Maize roots exude cyclic hydroxamic acids, one of which (2,-4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) attracts Pratylenchus zeae at concentrations in host exudates (44).…”

Section: Miscellaneousmentioning

confidence: 99%

“…The review is largely organized by phytochemical structure, although such an organization will necessarily be imperfect. Not included is a discussion of the general chemical ecology of nematodes, an area addressed elsewhere (46,126). Similarly, this review does not concentrate upon studies in which plants or crude extracts were examined for nematode-antagonistic activity, unless the active compound was identified.…”

Section: Introductionmentioning

confidence: 99%

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PHYTOCHEMICALBASEDSTRATEGIES FORNEMATODECONTROL

Chitwood

2002

Annu. Rev. Phytopathol.

694

451

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This review examines the discovery of naturally occurring phytochemicals antagonistic toward plant-parasitic and other nematodes. Higher plants have yielded a broad spectrum of active compounds, including polythienyls, isothiocyanates, glucosinolates, cyanogenic glycosides, polyacetylenes, alkaloids, lipids, terpenoids, sesquiterpenoids, diterpenoids, quassinoids, steroids, triterpenoids, simple and complex phenolics, and several other classes. Many other antinematodal compounds have been isolated from biocontrol and other fungi. Natural products active against mammalian parasites can serve as useful sources of compounds for examination of activity against plant parasites. The agricultural utilization of phytochemicals, although currently uneconomic in many situations, offers tremendous potential.

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Section: Miscellaneousmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PHYTOCHEMICALBASEDSTRATEGIES FORNEMATODECONTROL

Chitwood

2002

Annu. Rev. Phytopathol.

694

451

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“…However, older studies have indicated how important plant hormones were in the nematode–host interaction (reviewed by Gheysen, 1998). For example, Kochba and Samish (1971, 1972) elucidated a relationship between nematode resistance and low cytokinin levels in peach, whereas the application of exogenous kinetin enabled the nematode to overcome the resistance.…”

Section: Introductionmentioning

confidence: 99%

Identification of cytokinins produced by the plant parasitic nematodes Heterodera schachtii and Meloidogyne incognita

Meutter

Tytgat

Witters

et al. 2003

Molecular Plant Pathology

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SUMMARY The presence of different types of cytokinins was analysed in exudates and lysates of stage-2 juveniles of Heterodera schachtii and Meloidogyne incognita and in mixed stages of Caenorhabditis elegans. For all species, cytokinins were detected in lysates and exudates in which benzyladenine and zeatin-type cytokinins were the most prominent forms. The production of cytokinins by Meloidogyne was much higher than by Heterodera, and the detected levels were in a range which interfered with the physiological activities of the host plant. The presence of 5-methoxy-N,N-dimethyltryptamine hydrogen oxalate did not affect hormone production by H. schachtii, whereas resorcinol slightly stimulated hormone production by M. incognita. The exuded cytokinins may play a role in feeding site induction, more particularly in cell cycle activation and in establishing the feeding site as a nutrient sink.

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“…Many nematodes, including most plant parasitic species, inhabit the soil for at least part of their life cycle. Natural nematode behavior has been particularly difficult to study in this opaque, non-uniform environment [3] – [5] . As an attempt to gain insights into the behavior of pre-infective J2s, we developed a Petri dish assay using Pluronic F-127 (PF-127), a clear, non-toxic co-polymer that as a 23% aqueous solution is liquid at 15°C and solidifies into a soft gel at room temperature [6] .…”

Section: Introductionmentioning

confidence: 99%

Root-Knot Nematodes Exhibit Strain-Specific Clumping Behavior That Is Inherited as a Simple Genetic Trait

et al. 2010

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Root-knot nematodes are obligate parasites of a wide range of plant species and can feed only on the cytoplasm of living plant cells. In the absence of a suitable plant host, infective juveniles of strain VW9 of the Northern root-knot nematode, Meloidogyne hapla, when dispersed in Pluronic F-127 gel, aggregate into tight, spherical clumps containing thousands of worms. Aggregation or clumping behavior has been observed in diverse genera in the phylum Nematoda spanning free-living species such as Caenorhabditis elegans as well as both plant and animal parasites. Clumping behavior differs between strains of M. hapla and occurs with other species within this genus where strain-specific differences in clumping ability are also apparent. Exposure of M. hapla juveniles to a gradient formed using low levels of cyanide promotes formation of clumps at a preferred cyanide level. Analysis of F2 lines from a cross of M. hapla strains that differ in clump-forming behavior reveals that the behavior segregates as a single, major locus that can be positioned on the genetic map of this nematode. Clumping behavior may be a survival strategy whose importance and function depend on the niche of the nematode strain or species.

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Chemical Signals in the Plant—Nematode Interaction

Cited by 9 publications

References 91 publications

PHYTOCHEMICALBASEDSTRATEGIES FORNEMATODECONTROL

PHYTOCHEMICALBASEDSTRATEGIES FORNEMATODECONTROL

Identification of cytokinins produced by the plant parasitic nematodes Heterodera schachtii and Meloidogyne incognita

Root-Knot Nematodes Exhibit Strain-Specific Clumping Behavior That Is Inherited as a Simple Genetic Trait

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