The Study and Development of Endophytic Bacteria for Enhancing Organic Rice Growth

Abstract

Farmers in Han Thao Village, Kud Jab District, Udon Thani Province, cultivates rice (Oryza sativa L.), organically. Bio-products from microbial were required to be replacement of agrochemical to reach higher growth and yield. Isolates of endophytic bacteria were extracted from organic rice tissue. PGR producing activity such as indole-3-acetic acid (IAA) like substance was study. The isolates with potential to plant growth promotion were screened. Isolates with high productivity of IAA like substance were inoculated to seeds germinated between paper (BP) at 30°C for 7 days. Root and shoot length were measured. Ten isolates with high productivity of IAA like substances were poured to plants growing in plastic pots. Growth of plants was measured. There are 35 isolations of endophytic bacteria with high potential of IAA-like substances producing activity. Isolations of O-3-S-3(2) and O-1-S-2 increased shoot and root length of seedlings in paper germination. Inoculation of O-3-S-3(2) and O-1-S-2 into seedlings at 14-days after sowing in pots increased the highest number of shoots per plant and shoot height.