Table 4. Symbiotic properties of 4 week old bean plants.

Strain	Genotype	AR(µmol h−1 plant−1)	Nodule number	Bacteroid protein per plant (mg)	Bacteroid protein per nodule (ug)	AR per nodule (nmol h−1)	AR per bac prot (µmol h−1 mg prot−1)
RU2222	wild-type	3.6±0.3	261±13	0.90±0.07	3.5±0.3	13.9±0.8	4.1±0.3
RU1933	aapJQM::ΩSpbraE::TnphoA	1.3±0.3	142±18	0.54±0.13	3.7±0.6	8.6±1.2	2.4±0.1
p-values		<0.001	<0.001	0.036	0.724	0.005	<0.001

The values are the mean ± SEM of plants inoculated with RU2222 (n = 8) and RU1933 (n = 6). P-values were determined by ttest.