Abstract
A total of 30 bacterial isolates were isolated from soil, rhizoplane, and internal tissue of oil palm roots. The isolates were qualitatively tested for their potential to fix N2, solubilize inorganic P and K, and produce phytohormone indole-3-acetic acid. Of the 30 isolates, six isolates were able to exhibit multiple beneficial traits. All six isolates were then identified based on fatty acid methyl esters profile as Escherichia coli strain EX2, Serratia sp. strain EN1, Pantoea ananatis strain EN3, Bacillus sp. strain EN5, Pantoea ananatis strain EN8 and Pantoea sp. strain EN9. Subsequently, all shortlisted isolates were evaluated for plant growth-promoting potential by using shallot as a test plant. The plant test showed no significant difference (p>0.05) between inoculated and uninoculated plants except for Pantoea sp. strain EN9 inoculation which increased significantly (p<0.05) total root length over uninoculated control. Host specificity and IAA capacity of the isolates may be among the important factors affecting their effectiveness in plant growth promotion.
 J Bangladesh Agril Univ 17(3): 344–348, 2019
Highlights
Chemical fertilizer is widely used in agricultural crop production
The present study showed that EX2, EN1, EN3, EN5, EN8 and EN9 exhibited multiple plant growth-promoting traits where most of them were endophytic rhizobacteria or rhizobacteria isolates that recovered from interior root tissue of oil palm
Govindasamy et al (2017) who found that only 5 bacterial isolates from a total of 280 isolates (1.8%) from sorghum (Sorghum bicolor) rhizosphere were having multiple traits
Summary
Chemical fertilizer is widely used in agricultural crop production. improper use can cause negative effects to environment such as soil acidity and groundwater pollution. Srivastava and Singh (2017) stated that PGPR technology is a method used to dismiss the use of chemical fertilizers and pesticides by utilizing the microorganisms in soil. PGPR can be isolated from agricultural crops such as wheat (Majeed et al, 2015), rice (Tan et al, 2014), and oil palm (Azlin et al, 2005). Various successful application of PGPR on agricultural crops such as wheat (Kumar et al, 2017), maize (Sood et al, 2017), rice (Singh et al, 2016), bell pepper (Tariq et al, 2014), and oil palm (Zakry et al, 2012) were reported. Isolation of PGPR is a continuous process with aim to search for new strains of superior activity in plant growth promotion. Present study was aimed to isolate, and select for the most promising isolates in promoting plant growth
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