SUMMARY: Five strains of spp. (cowpea) formed effective nodules on green gram, black gram, pigeonpea, cowpea and guar as determined by acetylene reduction in excised roots and by measurement of plant dry weight. Hydrogen uptake (Hup) by nodules formed by different strains on these hosts was expressed only in black gram nodules. However, strain M-11, which is Hup, did not show hydrogenase activity in black gram. Acetylene reduction by detached nodules of black gram increased in the presence of hydrogen. However, there was no effect of added hydrogen on acetylene reduction by nodules of other host plants. Expression of uptake hydrogenase was apparently under the control of the host plant.


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