Table 1

Nodulation responses of photosynthetic bradyrhizobia and B. japonicum USDA 110 on three soybean cultivars

Culture conditionInoculantNodulation response ona:
G.max cv. WilliamsG. max cv. PekingG. max cv. Lambert
No. of nodulesNodule fresh mass (mg)ARAbNo. of nodulesNodule fresh mass (mg)ARANo. of nodulesNodule fresh mass (mg)ARA
28�CcUSDA 11010 � 2.383.2 � 23.194 � 0.023 � 138.4 � 2.448.0 � 7.78 � 1.411.5 � 2.416.6 � 2.9
ORS28524 � 1189.5 � 24.14.1 � 2.513 � 452.5 � 8.241.1 � 12.528 � 2.118.3 � 5.60.06 � 0.02
ORS278000000000
NId000000000
20�CeUSDA 11031 � 11.439.3 � 7.276.8 � 7.826 � 10135.3 � 13.7123.6 � 129 � 2.144.3 � 3.495.2 � 15.6
ORS28500037 � 1080 � 11.175.3 � 6.6000
ORS278000000000
NI000000000
  • a Values are the means of the results of five replicates � standard errors. Numbers of nodules and mass values (in mg) are per plant.

  • b ARA values are expressed in μmol C2H4/produced/h/plant.

  • c High temperature: 28�C for 16 h (light)/23�C for 8 h (dark).

  • d NI, not inoculated.

  • e Low temperature: 20�C for 16 h (light)/15�C for 8 h (dark).