[Population of entophytic bacteria in maize roots and its dynamic analysis]

In 2001-2002, 14 maize cultivars in Liaoning Province were used for the analysis of their entophytic bacteria population. The entophytic bacteria strains with a higher frequency in maize roots were Bacillus spp., Enterobacter spp., Serratia spp., Pseudomonas spp., Xanthomonas spp., Clavibacter spp., Bacillus spp., Enterobacter spp. and Serratia spp. Comparatively, Bacillus spp. was the most prevalent entophytic bacterium, including 8 species, B. subtilis, B. megaterium, B. cereus, B. licheniformis, B. anthracis, B. mycoides, B. pumilus and B. circulans, and with an average isolation frequency of 75.5% at seedling stage and 77.6% at adult stage. There existed significant differences in the population and dynamics of endophytic bacteria among maize cultivars and growth periods, and a significant correlation was found between maize genetic background and entophytic bacteria population.