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Plant Physiol. Oct 1986; 82(2): 588–590.
PMCID: PMC1056163

Regulation of the Soybean-Rhizobium Nodule Symbiosis by Shoot and Root Factors 1

Abstract

The availability of soybean mutants with altered symbiotic properties allowed an investigation of the shoot or root control of the relevant phenotype. By means of grafts between these mutants and wild-type plants (cultivar Bragg and Williams), we demonstrated that supernodulation as well as hypernodulation (nitrate tolerance in nodulation and lack of autoregulation) is shoot controlled in two mutants (nts382 and nts1116) belonging most likely to two separate complementation groups. The supernodulation phenotype was expressed on roots of the parent cultivar Bragg as well as the roots of cultivar Williams. Likewise it was shown that non-nodulation (resistance to Bradyrhizobium) is root controlled in mutant nod49. The shoot control of nodule initiation is epistatically suppressed by the non-nodulation, root-expressed mutation. These findings suggest that different plant organs can influence the expression of the nodulation phenotype.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Carroll BJ, McNeil DL, Gresshoff PM. Isolation and properties of soybean [Glycine max (L.) Merr.] mutants that nodulate in the presence of high nitrate concentrations. Proc Natl Acad Sci U S A. 1985 Jun;82(12):4162–4166. [PMC free article] [PubMed]
  • Carroll BJ, McNeil DL, Gresshoff PM. A Supernodulation and Nitrate-Tolerant Symbiotic (nts) Soybean Mutant. Plant Physiol. 1985 May;78(1):34–40. [PMC free article] [PubMed]
  • ELKAN GH. A nodulation-inhibiting root excretion from a non-nodulating soybean strain. Can J Microbiol. 1961 Dec;7:851–856. [PubMed]
  • Kosslak RM, Bohlool BB. Suppression of nodule development of one side of a split-root system of soybeans caused by prior inoculation of the other side. Plant Physiol. 1984 May;75(1):125–130. [PMC free article] [PubMed]
  • Pierce M, Bauer WD. A rapid regulatory response governing nodulation in soybean. Plant Physiol. 1983 Oct;73(2):286–290. [PMC free article] [PubMed]

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