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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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