The Flora Compositions of Nitrogen-Fixing Bacteria and the Differential Expression of nifH Gene in Pennisetum giganteum z.x.lin Roots

Figure 4

Relative expression value of nifH gene at different growth stages. The expression of nifH gene at different growth stages exhibited a downward trend after the initial increase. The value of 2^-△△CT at jointing stage was the highest, which was 4.43 times as much as at the seedling stage, and the value of 2^-△△CT at dying stage was lowest, which was 0.67 times. There were significant differences in 2^-△△CT values among groups during each period (). The 2^-△△CT values in each period make a great difference, and there were significant differences among each group.