Rhizobium strains expressing uptake hydrogenase in different host species of cowpea miscellany.
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Date
1987-06
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Abstract
Uptake hydrogenase activity in nodules of green gram (Vigna radiata (L.)
(Wilczek)), black gram (Vigna mungo (L.) (Hepper)), cowpea (Vigna unguiculata (L.) and
cluster bean (Cyamopsis tetragonoloba (L.) (Taub.)), formed with two Hup+ (S24 and
CT2014) and one Hup– (M11) Rhizobium strains, was determined at different levels of
external H2 in air atmosphere. Nodules of all the 4 host species formed by inoculation with
strains S24 and CT2014, showed H2 uptake but not those formed with strain M11. H2
uptake rates were higher in 1 and 2% H2 in air atmosphere (v/v) than at 5 or 10%
levels in all the host species. Variations in the relative rates of H2 uptake were observed
both, due to host species as well as due to Rhizobium strains. However, no host dependent
complete repression of the expression of H2 uptake activity was observed in nodules of any
of the host species formed with Hup+ strains.
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Keywords
Rhizobium strains, uptake hydrogenase, nitrogenase, hydrogenase repression, cowpea miscellany hosts
Citation
Dadarwal K R, Sindhu S S, Sharma H R. Rhizobium strains expressing uptake hydrogenase in different host species of cowpea miscellany. Journal of Biosciences. 1987 Jun; 12(2): 103-109.