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Hydrogen Uptake (HUP) Activity of Rhizobium japonicum from Major U.S. Soybean Production Areas
Author(s) -
Uratsu S. L.,
Keyser H. H.,
Weber D. F.,
Lim S. T.
Publication year - 1982
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1982.0011183x002200030040x
Subject(s) - biology , nitrogen fixation , rhizobium , bradyrhizobium japonicum , rhizobiaceae , agronomy , botany , horticulture , bacteria , symbiosis , inoculation , genetics
The purpose of these experiments was to determine the distribution of the hydrogen uptake (Hup) system among Rhizobium japonicum isolated from major soybean production areas of the USA. Soybean nodules were collected from approximately 100 different locations during the 1979 and 1980 growing seasons. The major conclusion is that a majority (> 75 %) of the Rhizobium japonicum strains isolated from major soybean producing areas are missing H 2 uptake activity. The role of the H 2 uptake system in energy efficiency of nitrogen fixation is discussed.