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Science 14 January 1994:
Vol. 263. no. 5144, pp. 221 - 223
DOI: 10.1126/science.263.5144.221
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Articles

Root-Knot Nematode—Directed Expression of a Plant Root—Specific Gene

Charles H. Opperman 1, Christopher G. Taylor 2, and Mark A. Conkling 2

1 Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616
2 Department of Genetics, North Carolina State University, Raleigh, NC 27695-7614

Root-knot nematodes are obligate plant parasites that induce development of an elaborate feeding site during root infection. Feeding-site formation results from a complex interaction between the pathogen and the host plant in which the nematode alters patterns of plant gene expression within the cells destined to become the feeding site. Expression of TobRB7, a gene expressed only in tobacco roots, is induced during feeding site development. The cis-acting sequences that mediate induction by the nematode are separate from those that control normal root-specific expression. Reporter transgenes driven by the nematode-responsive promoter sequences exhibit expression exclusively in the developing feeding site.

Submitted on July 26, 1993
Accepted on October 13, 1993


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