FIG. 5.

Symbiotic performance of an R. etli strain with a modified nitrogenase expression construct incorporated into pSym. (A) Specific nitrogenase activity of P. vulgaris plants inoculated with CFN42 or HP310; (B) plant weight at 32 dpi. Values are means ± standard deviations for 10 plants for each condition and time (n = 30). Asterisks indicate that the means of the samples are different at P <0.05. □, inoculation with CFN42; ▪, inoculation with HP310; ░⃞, noninoculated nonfertilized; ▨, noninoculated fertilized with 10 mM KNO₃-2 mM NH₄NO₃.