Impact of Pseudomonas aeruginosa MAJ PIA03 affecting the growth and phytonutrient production of castor, a primary host-plant of Samia ricini

Abstract

Castor (Ricinus communis L.) is a primary food plant of eri silkworm, Samia ricini Donovan endemic to Northeast India. Plant growth promoting rhizobacteria (PGPR) plays crucial role in growth and productivity of agricultural crops. Eighty-five Pseudomonas strains were isolated from thirty rhizosphere soil samples of castor and their in vitro potentiality was screened for growth promoting ability and antifungal potentialities. Most of the selected Pseudomonas sp. produced indole acetic acid, gibberellic acid, ACC deaminase activity, ammonia, hydrogen cyanide and siderophore, when tested in-vitro for PGP activity. Besides, the strains MAJ PIA01, MAJ PIA03 and MAJ PIA24 have got antifungal activity against five common plant pathogens. Upon their formulation and application in field by curtailing the recommended dose of inorganic fertilizers to 50 %, isolate no. MAJ PIA03 efficiently enhanced the agronomical traits such as number of leaves per plant, leaf biomass, root length, stem base diameter, shoot length, root biomass and leaf moisture content. Isolate no. MAJ PIA03 has significant impact on leaf biochemical constituents and augments the nutritional quality of castor leaf. The most efficient isolate MAJ PIA03 was identified as Pseudomonas aeruginosa MAJ PIA03 by polyphasic approach and its 16S rRNA gene homology. The bio-formulation of Pseudomonas aeruginosa MAJ PIA03 with 50 % diminution on recommended inorganic NPK dose could be used as an effective mechanism to improve Ricinus communis plant growth as well as leaf nutritional enhancement for sustainable eri sericulture.

Strategy For Controlling Bacterial Leaf Blight (Xanthomonas sp.) on Eucalyptus Pellita Plants by Administering P. aeruginosa RE081

“…The higher severity of disease in the treatment given P. aeruginosa RE081 compared to the control is thought to be due to increased nutrients, especially P and N in the growing media for E. Pellita seedlings. Research conducted in vitro by Marfungah et al (2023) reported that the characteristics of P. aeruginosa RE081 as a biocontrol agent could produce siderophores, HCN, Protease, IAA, and solvent P. This was confirmed by other research reported by Sandilya et al al. (2017), who stated that the Pseudomonas aeruginosa strain MAJPIA03 bacteria is capable of producing NH3, HCN, siderophores, ACC deaminase, IAA, and gibberellins.…”

Detection of Genes Responsible for Heavy Metals Resistance in Locally Isolated Pseudomonas Spp.

“…The highest IAA producing strain was B49 (35.15±0.76 μg/ml) followed by B46 (28.59±0.05 μg/ml) and B4 (26.98±0.42 μg/ml). Sandilya et al (37) reported that eight Pseudomonas spp. isolates derived from castor rhizosphere showed IAA production in vitro ranged from 5.19 μg/ml to 27.84 μg/ml.…”

Potential Application of Rhizobacteria Isolated from the Central Highland of Vietnam as an Effective Biocontrol Agent of Robusta Coffee Nematodes and as a Bio-Fertilizer

“…Biosynthesis of IAA by Pseudomonas aeruginosa has been widely reported [59][60][61][62][63][64][65][66][67][68]; however, only a few studies have reported the production of GA3 by Pseudomonas aeruginosa [67][68][69]. Although cytokinin compounds have also been reported to be produced by Pseudomonas aeruginosa, there are quite a few reports on the biosynthesis of zeatin, and kinetin by this bacterial genus [68,[70][71][72].…”