In this study, the EDB population was maximal at the nursery stage, and decreased in all tissues with rice growth
stage. Our results are in agreement with Mano et al. (2007),
who reported that the total number of endophytic root bacteria
was greatest in the rice roots at the early stage (Mano et al.
2007). However, Koomnok et al. (2007) reported that the
number of diazotrophic bacteria in cultivated rice varieties
Khao Dawk Mali 105, Kum Doi Saket and Bue Po Lo
increased with aeing of the plants, to a maximum at the heading stage.