Affiliation:
1. Plant Protection Research Institute, Pretoria 0001, South Africa
Abstract
Nine strains of
Rhizobium meliloti
, ranging in competitive ability on
Medicago sativa
from excellent to poor in autoclaved soils, were paired in 29 combinations and used to inoculate
M. sativa
in a liquid rooting medium. A positive correlation (
r
= 0.545) between strain ratios in nodules after 28 days and root surface cell ratios after 7 days was determined. Two cell fractions from the root surface, representing loosely and firmly adhering cells, were investigated. Infectivity was linked to the more firmly adhering cells. A significant relationship was established between the cell ratios of competing strains in the two fractions. In another experiment, adherence of cells of both infective and noninfective
Rhizobium
strains to roots of
M. sativa
and
Trifolium repens
was demonstrated; the ratios of loosely to firmly adhering cells on the root surface were significantly narrower with the infective combinations than with noninfective strain-legume associations.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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