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Plant Physiol, November 2000, Vol. 124, pp. 1039-1048

Localization of a Nod Factor-Binding Protein in Legume Roots and Factors Influencing Its Distribution and Expression1

Gurpreet Kalsi and Marilynn E. Etzler*

Section of Molecular and Cellular Biology, University of California, Davis, California 95616

The roots of the legume Dolichos biflorus contain a lectin/nucleotide phosphohydrolase (Db-LNP) that binds to the Nod factor signals produced by rhizobia that nodulate this plant. In this study we show that Db-LNP is differentially distributed along the surface of the root axis in a pattern that correlates with the zone of nodulation of the root. Db-LNP is present on the surface of young and emerging root hairs and redistributes to the tips of the root hairs in response to treatment of the roots with a rhizobial symbiont or with a carbohydrate ligand. This redistribution does not occur in response to a non-symbiotic rhizobial strain or a root pathogen. Db-LNP is also present in the root pericycle where its level decreases upon initiation of nodule formation. Maximum levels of Db-LNP are found in 2-d-old roots, and the expression of this root protein is increased when the plants are grown in the absence of NO3- and NH4+. These results support the possibility that Db-LNP is involved in the initiation of the Rhizobium legume symbiosis.

1 This research was supported by the National Institute of General Medical Sciences-National Institutes of Health (grant no. GM21882) and by the U.S. Department of Agriculture (grant no. 97-35305-4630).

* Corresponding author; e-mail meetzler{at}ucdavis.edu; fax 530-752-3085.

© 2000 American Society of Plant Physiologists


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