Affiliation:
1. Genetics Department, Research School of Biological Sciences, Australian National University, Canberra City, Australian Capital Territory, 2601, Australia
Abstract
Rhizobium-Azospirillum
interactions during establishment of
Rhizobium
-clover symbiosis were studied. When mixed cultures of
Azospirillum
and
Rhizobium trifolii
strains were simultaneously inoculated onto clover plants, no nodulation by
R. trifolii
was observed.
R. trifolii
ANU1030, which nodulated clover plants without attacking root hairs, i.e., does not cause root hair curling (Hac
−
), did not show inhibition of nodulation when inoculated together with
Azospirillum
strains. Isolation of bacteria from surface-sterilized roots showed that azospirilla could be isolated both from within root segments and from nodules. Inhibition of nodulation could be mimicked by the addition of auxins to the plant growth medium.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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