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. 1985 Mar;77(3):621–625. doi: 10.1104/pp.77.3.621

Host Recognition in the Rhizobium-Soybean Symbiosis 1

Evidence for the Involvement of Lectin in Nodulation

Larry J Halverson 1, Gary Stacey 1
PMCID: PMC1064575  PMID: 16664109

Abstract

Rhizobium japonicum mutant strain HS111 was previously shown to be defective in the rate of initiation of infection leading to subsequent nodule formation (1984 Plant Physiol 74: 84-89). Mutant strain HS111's defect in nodulation can be phenotypically reversed to wild type levels by pretreatment with root exudates from all soybean varieties that have been tested. The data indicate that lectin-Rhizobium interaction is necessary for the phenotypic reversal of the nodulation characteristics of mutant strain HS111. Pretreatment of strain HS111 with soybean seed lectin mimics the effect of root exudate pretreatment. In addition, the presence of 30 millimolar d-galactose, a hapten of soybean seed lectin, in the root exudate or soybean seed lectin pretreatment solution prevents enhancement of nodulation of strain HS111. Pretreatment of mutant strain HS111 in soybean root exudate which has had galactose-specific lectin(s) removed by affinity chromatography (affinity eluate) results in no enhancement of nodulation by strain HS111. Lectin(s) subsequently removed from the affinity column possesses 100% of the stimulatory activity originally found in the root exudate. Pretreatment of strain HS111 in root exudate from a soybean seed line (T102) known to lack seed lectin due to an insertion in the structural gene results in the reversal of the defective nodulation phenotype. This latter result indicates that the lectin found in soybean root exudate is genetically distinct from the seed lectin. It is apparently this root lectin that is involved in nodulation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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