Table 3.

Inhibition of K. pneumoniae nitrogenase activity by R. leguminosarum hupS_p sequences

Strain/plasmid*	hupSp sequences (bp upstream of +1)	Nitrogenase† activity	% inhibition
UNF122	None	0.53  ±  0.15	0
UNF122 (pBC KS)	None	0.56  ±  0.18	0
UNF122 (pBC315)	880	0.06  ±  0.05	91
UNF122 (pBC47)	173	0.06  ±  0.04	90
UNF122 (pBC58)	88	0.54  ±  0.10	0

^*Inserts from plasmids pHL315, pHL47, and pHL58 were cloned in pBC KS to yield pBC315, pBC47, and pBC58, respectively. 

^†Values [μmol of C₂H₂ reduced ⋅ h⁻¹ ⋅ (ml of culture)⁻¹] are the average of four independent determinations ± SE.