Abstract
The objectives of this study were to isolate and characterize endophytic bacteria from various rice tissues focusing on
their ability to produce indole acetic acid (IAA). Rice tissue samples were collected from different three types of rice
farm; 1 year, 3 years organic rice, and conventional rice farms in Udon Thani, Thailand. Seventy-one isolates of
endophytic bacteria were screened using PDA and TSA medium. The majority of strains isolated from root tissues
were totally 26 isolates, exclusively collected from 3 years organic rice farm. Phenotypic characteristics of all isolates
illustrated that 34 isolates were identified as Pesudomonas sp., while other isolates were also identified as Bacillus,
Azotobacter, and Enterobacter species. The study of IAA production indicated that 4 isolates efficiently produced
IAA over than 10