Siderophore as a Potential Plant Growth-Promoting Agent Produced by Pseudomonas aeruginosa JAS-25

Abstract

Siderophores scavenges Fe(+3) from the vicinity of the roots of plants, and thus limit the amount of iron required for the growth of pathogens such as Fusarium oxysporum, Pythium ultimum, and Fusarium udum, which cause wilt and root rot disease in crops. The ability of Pseudomonas to grow and to produce siderophore depends upon the iron content, pH, and temperature. Maximum yield of siderophore of 130 μM was observed at pH 7.0 ± 0.2 and temperature of 30 °C at 30 h. The threshold level of iron was 50 μM, which increases up to 150 μM, favoring growth but drastically affecting the production of siderophore by Pseudomonas aeruginosa JAS-25. The seeds of agricultural crops like Cicer arietinum (chick pea), Cajanus cajan (pigeon pea), and Arachis hypogaea (ground nut) were treated with P. aeruginosa JAS-25, which enhanced the seed germination, root length, shoot length, and dry weight of chick pea, pigeon pea, and ground nut plants under pot studies. The efficient growth of the plants was not only due to the biocontrol activity of the siderophore produced by P. aeruginosa JAS-25 but also may be by the production of indole acetic acid (IAA), which influences the growth of the plants as phytohormones.

Biocontrol activity of siderophore producing Bacillus subtilis CTS-G24 against wilt and dry root rot causing fungi in chickpea

“…As expected, no colour change was observed in the uninoculated plates after incubation for 3 weeks. Similar finding have been reported by several workers [24,25]. Spectrophotometric analysis of the culture in standard succinate medium showed a peak between 420 to 450 nm (Fig.…”

Diversity of plant growth-promoting bacteria associated with sugarcane

“…Several studies have found P. fluorescens, P. putida, P. aeruginosa, and Pseudomonas sp promoting the plant growth through the BNF, production of hormones, and siderophores in rice (Oryza sativa), rapeseed (Brassica napus L.), ginger (Zingiber officinale), corn (Zea mays L.), and sugarcane (Sarcarumm L.) (Sulochana et al, 2014).…”

Biocontrol of Bacterial Leaf Blight of Rice and Profiling of Secondary Metabolites Produced by Rhizospheric Pseudomonas aeruginosa BRp3

“…Siderophores have also been reported to induce systemic acquired resistance (Trivedi et al, 2008; Sulochana et al, 2014). P. aeruginosa BRp3 produces 1-hydroxy-phenazine, pyocyanin (Figure 1) and pyochelin ( m/z 325, Figure 2).…”

“…aeruginosa in the suppression of charcoal rot disease of chickpea. Different types of siderophores such as pesudobactin and pyoverdine produced by rhizospheric bacteria chelate to the available form of iron present in the soil and suppress the pathogens by reducing the availability of iron for the phytopathogen (Wensing et al, 2010; Sulochana et al, 2014). Notably, the number of rhizosphere-associated Pseudomonas species involved in yield enhancement (Combes et al, 2011) and/or reduction in plant diseases, are increasing (Couillerot et al, 2009; Beneduzi et al, 2012).…”