Screening of Actinobacteria from Coconut Plantation Soils with Plant Growth Promotion Properties
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Abstract
Coconut is an important economic crop in Thailand. In addition to the soil organic matter, microorganisms living in soil also play an important role in plant growth promotion by enhancing mineral absorption and controlling plant - pathogenic microorganisms. The aims of this study were to isolate actinobacteria from aromatic (Nam - Hom) coconut plantation soil and investigated their plant growth promotion properties. The results showed that a total of 38 actinobacteria were obtained from the coconut plantation soil of Pran Buri, Prachuap Khiri Khan (20 isolates) and Bang Khonthi, Samut Songkhram (18 isolates). All isolates were screened for plant growth promotion properties. The results revealed that 10 isolates were found to solubilize phosphate, 25 and 17 isolates showed siderophore and indole acetic acid production, respectively. Furthermore, actinobacteria 18 and 19 isolates could produce enzyme degrade cellulose and chitin on tested - medium, respectively. Isolates R17 - 116, R17 - 210 and R17 - 208 showed high potentials of plant growth promotion features. They could convert insoluble phosphorus into soluble forms that can easily be assimilated by plants. Furthermore, they could produce siderophore which is an iron - bound substance capturing iron from soil and could produce indole acetic acid, plant hormone of auxin class. These 3 isolates will be selected for further study and for application in agriculture.
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References
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