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Introduction of Effective N2‐Fixing Rhizobia1 Strains into the Soybean Plant by Use of Fungicide Resistance 1
Author(s) -
Jones Roger,
Giddens Joel
Publication year - 1984
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1984.00021962007600040022x
Subject(s) - fungicide , rhizobia , rhizosphere , microbial inoculant , biology , inoculation , thiram , agronomy , seed treatment , bradyrhizobium japonicum , rhizobium , horticulture , nitrogen fixation , symbiosis , rhizobiaceae , bacteria , genetics , germination
Experiments were designed to determine if thiram seed treatment reduces populations of competing rhizosphere microorganisms and enhances nodule formation by an effective inoculant strain. Soybeans [ Glycine max (L.) Merr.] inoculated in a greenhouse experiment with an effective, fungicide‐resistant mutant of Rhizobium japonicum USDA 110 were shown to produce a greater proportion of nodule isolates that were fungicide resistant. Populations of fungicide resistant rhizobia in the rhizosphere were also found to be higher with fungicide treated than with untreated seed. Rhizosphere total bacterial counts and protozoan populations were lower with treated seed but seed treatment did not significantly affect plant growth. The use of fungicide seed treatment and inoculation with effective (high N 2 ‐fixing) fungicide resistant R. japonicum may offer an improved method of soybean inoculation.