The Potency of Bacterial Associating Endemic Plants of The Java Coastal Area in Inducing Salt Tolerant in Agricultural Crops

Recent studies indicate that many plant species have ability to adapt to environmental stress because of their association with microbes. The aim of the research is to explore and to characterize bacterial endophyte and rhizoplane from endemic plants of the Java coastal area that induced salt tolerance in agricultural crops. Among the 1358 isolates of salt tolerant bacteria that have been isolated from 218 of different costal plants showed that 108 isolates of bacterial rhizoplane, 87 isolates of bacterial root endophytes and 35 isolates of bacterial leaf endophyte have the ability to promote rice seedling growth. An amount of 33 isolates with vigor index (VI) value more than 1200 were tested at different levels of NaCl concentration (0, 50, 100, 150 and 200 mM). Fifteen bacterial isolates significantly increased VI value of rice seedling by up to 50% over uninoculated control at NaCl concentration more than 100 mM. Characterization of these 33 isolates revealed 32 isolates degraded pectin, 26 isolates produced indole acetic acid (IAA), 18 isolates solubilized phosphate, 15 isolates showed 1aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, 11 isolates produced hidrogene cyanide (HCN).