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This article in AJ

  1. Vol. 79 No. 4, p. 595-598
     
    Received: Apr 28, 1986
    Published: July, 1987


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doi:10.2134/agronj1987.00021962007900040002x

Soybean Specificity for Bradyrhizobium japonicum Strain 1101

  1. P. K. W. Howle,
  2. E. R. Shipe and
  3. H. D. Skipper2

Abstract

Abstract

The specificity of six Maturity Group VI1 soybean [Glycine max (L.) Merr.] cultivars to inoculation with Bradyrhizobium japonicum Strain USDA 3Ilb110 was measured relative to indigenous B. japonicum populations in 1981 and 1982 in two environments in South Carolina. The Clemson experiment was on a Chewacla soil (fineloamy, acid, thermic Aquic Fluventic Dystrochepts) in 1981, and on a Toccoa soil (coarse-loamy, mixed, nonacid, thermic Typic Udifluvents) in 1982. The Florence experiments were on a Norfolk soil (fine-loamy, siliceous, thermic Typic Paleudults). Top dry weight and plant N content, and the number and dry weight of nodules per plant were determined at the R5 growth stages. Seed yield and N content were also measured. No differences were detected (≤0.05) due to inoculation for any variable studied. Genotypic differences occurred in harvest yield rankings, with three of the four tests having similar cultivar rankings. Nodule occupancy was determined by serological assay against 15 antisera. Serogroup 110 was not recovered from the Clemson sites and ≤ 8% from the Florence site. Serogroup 31 was the predominant, indigenous strain identified at both locations and occupied 9 to 34% of the nodules. Nodule occupancy by a less efficient serogroup, 31, is a limiting factor to soybean production. No specificity was detected between Strain 110 and six soybean cultivars.

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