Plant Growth Promotion Rhizobacteria in Onion Production

Abstract

The aim of the research was to examine the effect of rhizospheric bacteria Azotobacter chroococcum, Pseudomonas fluorescens (strains 1 and 2) and Bacillus subtilis on the growth and yield of onion and on the microorganisms in the rhizosphere of onion. The ability of microorganisms to produce indole-acetic acid (IAA), siderophores and to solubilize tricalcium phosphate (TCP) was also assessed. The experiment was conducted in field conditions, in chernozem type of soil. Bacillus subtilis was the best producer of IAA, whereas Pseudomonas fluorescens strains were better at producing siderophores and solubilizing phosphates. The longest seedling was observed with the application of Azotobacter chroococcum. The height of the plants sixty days after sowing was greater in all the inoculated variants than in the control. The highest onion yield was observed in Bacillus subtilis and Azotobacter chroococcum variants. The total number of bacteria and the number of Azotobacter chroococcum were larger in all the inoculated variants then in the control. The number of fungi decreased in most of the inoculated variants, whereas the number of actinomycetes decreased or remained the same.

Screening and Assessment of Potential Plant Growth-promoting Bacteria Associated with <i>Allium cepa</i> Linn.

“…Although previous studies reported the positive and negative effects of PGPB on onion (Allium cepa Linn.) (Jha et al, 2005;Čolo et al, 2014), few PGPB have been isolated from onion even though Taiwan ranks third in the world for onion yield hectare -1 (Fatih, 2018). Due to the low absorption and penetration abilities of the onion's root system as well as the high potential for weed invasion during planting, onion is a suitable candidate for the application of PGPB.…”

Bacillusspecies in soil as a natural resource for plant health and nutrition

“…Bacillus circulans CB7 isolated from apple rhizosphere soil with multifaceted PGP traits like P‐solubilization, production of auxins, ACC deaminase and siderophore was shown to have positive influence on the plant growth parameters in tomato under net house condition (Mehta et al ). Bacillus subtilis with the ability to produce IAA was shown to influence the plant growth and yield of onion (Čolo et al ). Bacillus velezensis FZB42, a model for plant growth promoting, and biocontrol strains of Bacillus have been shown to promote growth and suppress diseases in various crops like potato, cotton, wheat, tomato, strawberry and lettuce (Fan et al ).…”

Aplikasi dan efektivitas pupuk hayati dalam upaya perbaikan mutu produksi, produktivitas dan pengendalian serangan layu fusarium pada bawang merah

“…Korelasi yang positif antara pertumbuhan vegetatif yang optimal dan peningkatan bobot umbi basah dan kering pada tanaman bawang merah yang diberi perlakuan kombinasi pupuk hayati dan pupuk kimia sintetik juga mengindikasikan bahwa mikrob pemacu pertumbuhan yang terkandung pada pupuk hayati mampu bersinergi dengan lingkungan tumbuh dan memberikan pengaruh terhadap peningkatan proses fisiologis tanaman dan akumulasi biomasa pada umbi bawang (Colo et al, 2014). Peningkatan kualitas pertumbuhan ini dimungkinkan berasal dari efek promotif pertumbuhan mikrob yang terkandung pada pupuk hayati dalam peningkatan penyerapan unsur hara akibat ketersediaan unsur hara yang meningkat dalam tanah (Nadeem et al, 2016;Yildirim et al, 2011) dan perlindungan tanaman terhadap serangan penyakit (Fernandes et al, 2018).…”