. 2016 May 18;17(5):755. doi: 10.3390/ijms17050755

Table 2.

Effect of the mutation of the Sinorhizobium fredii strains HH103 and USDA257 tts genes on soybean nodulation.

tts Gene Mutated	Function	Symbiotic Phenotype in American or Asiatic Soybean Cultivars
tts Gene Mutated	Function	HH103	USDA257
rhcJ	T3SS machinery	American and Asiatic: reduced nodule number, mass of nodules and plant-top dry mass [109]	American: Fix⁻ to Fix⁺ [49]
rhcC1	T3SS machinery	–	American: Fix⁻ to Fix⁺ [49]
nolU	T3SS machinery	–	American: Fix⁻ to Fix⁺ [49]
rhcL	T3SS machinery	–	American: Fix⁻ to Fix⁺ [49]
rhcN	T3SS machinery	–	American: Fix⁻ to Fix⁺ [48,110]
rhcN	T3SS machinery	–	Asiatic: negative effect [110]
y4yA	Unknown	–	American and Asiatic: no effect [111]
y4yB	Unknown	–	American and Asiatic: no effect [112]
y4xP	Cysteine synthase	–	American and Asiatic: no effect [112]
nopA	T3SS pilus	American: reduced nodulation [113]	American: Fix⁻ to Fix⁺
nopA	T3SS pilus	American: reduced nodulation [113]	Asiatic: reduced nodulation [114]
nopB	T3SS pilus	–	American: Fix⁻ to Fix⁺ [49]
nopB	T3SS pilus	–	Asiatic: negative effect [115]
nopX	T3SS pilus/effector translocation?	American: reduced nodulation [116]	American: Fix⁻ to Fix⁺ [49]
nopX	T3SS pilus/effector translocation?	American: reduced nodulation [116]	Asiatic: delayed nodulation [116]
nopC	Effector	American and Asiatic: reduced nodulation [113]	–
nopP	Effector	American and Asiatic: increased nodule number and plant-top dry mass [117]	-