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Journal of Plant Growth Regulation
Bird, D.M., Plant Nematode Genetics Group, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695, United States
Koltai, H., Plant Nematode Genetics Group, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695, United States
Plant parasitic nematodes are ubiquitous and cosmopolitan pathogens of vascular plants and exploit all parts of the roots and shoots, causing substantial crop damage. Nematodes deploy a broad spectrum of feeding strategies, ranging from simple grazing to the establishment of complex cellular structures (including galls) in host tissues. Various models of feeding site formation have been proposed, and a role for phytohormones has long been speculated, although whether they perform a primary or secondary function is unclear. On the basis of recent molecular evidence, we present several scenarios involving phytohormones in the induction of giant cells by root-knot nematode. The origin of parasitism by nematodes, including the acquisition of genes to synthesize or modulate phytohormones also is discussed, and models for horizontal gene transfer are presented.
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Plant parasitic nematodes: Habitats, hormones, and horizontally-acquired genes
19
Bird, D.M., Plant Nematode Genetics Group, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695, United States
Koltai, H., Plant Nematode Genetics Group, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695, United States
Plant parasitic nematodes: Habitats, hormones, and horizontally-acquired genes
Plant parasitic nematodes are ubiquitous and cosmopolitan pathogens of vascular plants and exploit all parts of the roots and shoots, causing substantial crop damage. Nematodes deploy a broad spectrum of feeding strategies, ranging from simple grazing to the establishment of complex cellular structures (including galls) in host tissues. Various models of feeding site formation have been proposed, and a role for phytohormones has long been speculated, although whether they perform a primary or secondary function is unclear. On the basis of recent molecular evidence, we present several scenarios involving phytohormones in the induction of giant cells by root-knot nematode. The origin of parasitism by nematodes, including the acquisition of genes to synthesize or modulate phytohormones also is discussed, and models for horizontal gene transfer are presented.
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