Mature Nodules and Root Tips Control Nodulation in Soybean

Gustavo Caetano-Anollés, Ellen T. Paparozziz, Peter M. Gresshoff

Research output: Contribution to journalArticlepeer-review

Abstract

Nodule formation in soybean (Glycine max (L.) Merr.) is suppressed in younger regions of the root system as a feedback response to development of first nodules. Removal of functional nodules caused already initiated infections to develop into mature nodules, in the same regions of the roots where the initial nodules were formed. This was true for soybean cv. Bragg and the supernodulating mutant derivative nts382. In experiments where the tips of the lateral roots of Bragg were removed before or at inoculation, nodulation on the primary root was considerably increased. In contrast, removal of the lateral root tips from nts382 had no effect. Our results suggest that nodulation in soybean is preferentially controlled by the arrest rather than the abortion of early subepidermal cell division during nodule development, and that both mature nodules and root apical meristems elicit feedback regulation of nodule formation.

Original languageEnglish (US)
Pages (from-to)389-396
Number of pages8
JournalJournal of Plant Physiology
Volume137
Issue number4
DOIs
StatePublished - 1991
Externally publishedYes

Keywords

  • Bradyrhizobium japonicum
  • EH
  • Glycine max
  • RDU
  • RT
  • feedback regulation
  • nodulation
  • relative distance unit
  • root meristems
  • root tip
  • smallest emergent root hair
  • symbiosis

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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