Identification of Acetoin Producing Rhizobacteria as Rice Plant Growth Control (Oryza sativa) from The Rhizosphere of Elephant Grass Plant (Pennisetum purpureum) using Gas Chromatography Mass Spectrometry (GC-MS) and Scanning Electron Microscope (SEM)

Abstract

The compound of acetoin (3-hydroxybutan-2-butanone) is a volatile compound produced by bacteria that functions as a booster for plant growth or as a biostimulant. Acetoin plays an important role in stimulating the process of organogenesis (morphogenesis) plants so that the formation of plant organs faster and faster plant growth. Besides being able to increase the growth of acetoin, it can also induce plant resistance, increase the formation of branches, roots and flowers so that acetoin can increase plant productivity. The purpose of this study was to identify acetoin-producing rhizobacteria which can stimulate rice growth. Identification of compounds was carried out using Gas Chromatography Mass Spectrometry (GC-MS) and Scanning Electron Microscope (SEM). This study obtained one rhizobacterial isolate capable of producing acetoin which acts as a plant growth booster, namely Rg21. This rhizobacterial isolate was able to increase the number of lateral roots of rice seedlings at the age of 14 days after plants with a percentage increase of 50.00% when compared to controls.