Biological activity of indigenous selected plant growth promoting rhizobacteria isolates and their ability to improve the growth traits of shallot (Allium ascalonicum L.)
2022
Yanti, Y. | Hamid, H. | Nurbailis | Suriani, N.L.
The bacterial leaf blight is the primary disease and causes a significant loss of shallot yield in West Sumatera, Indonesia. Plant growth-promoting rhizobacteria (PGPR) is essential in suppressing diseases and improving shallots' growth and health. This study aimed to characterize and investigate the ability of PGPR isolates to control shallots bacterial leaf blight disease and improve its growth. Ten isolates of PGPR designated as Bacillus thuringiensis strain MRSNRZ3.1, B. mycoides strain MRSNUMBE2.2, B. mycoides strain MRBPBT2.1, B. waihenstephanensis strain MRBTLL3.2, B. subtilis strain MRTDUMBE3.2.1, B. cereus strain MRDKBTE1.3, B. cereus MRPLUMBE1.3, Achromobacter insolitus strain MRBPUMBE1.3, Pseudomonas hibiscicola strain MRTLDRZ2.2, and Bacillus sp. strain MRSPRZ1.1 were collected from the rhizosphere and endosphere of shallots from Agam and Solok Regency. The variables observed were biocontrol characters (HCN production and siderophore) and biofertilizer characters (indole acetic acid production, ammonia, and phosphate dissolution). These isolates showed activity in controlling leaf blight caused by Xanthomonas axonopodis. The present study also suggests that PGPR isolates, viz. MRSNRZ3.1, MRSNUMBE2.2, MRBPBT2.1, MRBTLL3.2, MRTDUMMBE3.2.1, MRDKBTE1.3, MRPLUMBE1.3, MRBPUMBE1.3, MRTLDRZ2.2, and MRSPRZ1.1 may be used as biofertilizers to enhance the growth and productivity of shallots. This finding suggests that identified PGPR isolates can be used as biological control agents and biofertilizers to enhance the growth and productivity of shallot.
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