Siderophoregenic Acinetobacter calcoaceticus isolated from wheat rhizosphere with strong PGPR activity

Abstract

Thirty-two bacterial isolates were obtained from wheat rhizosphere in black cotton soils of North Maharashtra region and subsequently tested for in-vitro siderophore production. Wheat isolate SCW1, being a strong siderophore producer, was selected, identified and confirmed as Acinetobacter calcoaceticus. The strain produced catechol type of siderophores during exponential phase which was influenced by iron content of medium. Seed bacterization with siderophoregenic A. calcoaceticus improved plant growth in pot and field studies. Such PGPR activity was attributed to the ability of strain to solubilise phosphates and produce IAA. Siderophore mediated antagonism was observed against common phytopathogens viz., Aspergillus flavus, A. niger, Colletotrichum capsicum and Fusarium oxysporum.

Enhancement of alfalfa yield and quality by plant growth‐promoting rhizobacteria under saline‐alkali conditions

“…Except for direct mechanisms, PGPR are still able to promote plant growth by indirect mechanisms such as siderophore production and phosphate solubilization. Some PGPR, such as Acinetobacter calcoaceticus , produces siderophores and can grow in iron‐free media . Lee et al .…”

Suppression of tomato wilt by cell-free supernatants of Acinetobacter baumannii isolates from wild cacao from the Colombian Amazon

“…However, as these supernatants were rich in siderophores, it is possible that the antagonistic activity was at least partially generated by these molecules. Prashant et al ( 2009 ) demonstrated the antifungal activity of catechol-like siderophores from Acinetobacter calcoaceticus strain SCW1 against Aspergillus flavus , Aspergillus niger , Colletotrichum capsicum , and F. oxysporum . Sayyed and Reddy ( 2011 ) reported the growth inhibitory potential of siderophore-rich cell-free supernatants obtained from Acinetobacter sp.…”

Rhizospheric bacteria as potential biocontrol agents against Fusarium wilt and crown and root rot diseases in tomato

“…isolates ( Kwon and Song, 2014 ). It has been reported that Acinetobacter calcoaceticus displays IAA and siderophore production that promotes wheat plant growth, with antagonistic activity to different phytopathogens such as Fusarium oxysporum , Aspergillus flavus and A. niger ( Sarode Prashant et al, 2009 ). Bacillus thuringiensis isolate has also been reported to promote growth in Abelmoschus esculentus plants by phosphate solubilization ( Bandopadhyay, 2020 ).…”