Bacillus and Endomicrobiome: Biodiversity and Potential Applications in Agriculture

Nambirajan, Guruvu; Ashok, Ganapathy; Baskaran, K.; Chandran, Viswanathan

doi:10.1007/978-981-15-3208-5_8

Cited by 4 publications

(1 citation statement)

References 134 publications

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“…reported earlier.Various plant growth-promoting bacilli mediating plant growth, soil biological process, nutrientmobilization and biocontrol action have been reported globally (Cherif-Silini et al 2016; Kumar et l. 2014, Mehmood et al 2021; Sun and Zhang 2021; Zafar-ul-Hye et al 2019) but role of sole IAA producing bacilli with a few other PGP traits on crop is fragmentary. The bacilli comprising Paenibacillus, Brevibacillus, Virgibacillus, Lysinibacillus, Geobacillus, Virgibacillus and Virdibacillus are found to be ubiquitous in nature and possess multiple growth-promoting traits (Saxena et al 2020; Tiwari et al 2019).Approximately 95% of bacterial species in the rhizosphere and endorhizosphere are Bacillus species with the ability to promote plant growth and produce antimicrobial metabolites for the biocontrol of pathogens(Maplestone and Campbell 1989;Nambirajan et al 2020). In plants, root exudates of various plants contain tryptophan, which is used by microorganisms as a metabolic precursor for the synthesis and release of auxins as secondary metabolites in the rhizosphere and can in uence root growth(Kravchenko et al 2004).…”

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confidence: 99%

Bacillus species consortium with tryptophan-dependent and -independent pathways mediated IAA production modulates soil biological properties, growth and yield of wheat

SHARMA,

Goud,

Kharbikar

et al. 2023

Preprint

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Background and Aims: Operation of both tryptophan-dependent and -independent pathways leading to higher IAA production by certain bacteria is known to beneficially influence plant growth and development. This study aimed to detect the operation of different pathways in bacteria for IAA production and evaluate the PGP (plant growth promoting) potential of the best IAA-producing bacteria in wheat crop. Methods The bacteria isolated from chickpea rhizosphere were screened for IAA production through tryptophan-dependent and independent pathways. The prominent IAA producing bacteria were identified by 16S rRNA gene sequencing and evaluated for their growth promoting, soil and plant nutrient enriching potential in wheat crop (cv. Sujata). Results Out of the 80 bacteria screened, three isolates, KS-14, BEMS-9-1 and BS-2 were found to produce high levels of IAA by operating both the pathways. These isolates were identified as Brevibacillus formosus, Bacillus paramycoides and Bacillus tequilensis, respectively. Evaluation of various combinations of these promising bacteria showed that the consortium of Brevibacillus formosus KS-14 and Bacillus paramycoides BEMS-9-1 along with a 50% recommended dose of fertilizer (RDF) not only significantly improved the morphological and physiological traits of wheat including yield and grain micronutrient loading, mediated through enhanced soil biological activities. To the best of our knowledge, this is the first report of the occurrence of tryptophan–independent pathway for IAA production in the three bacilli. Conclusion This study is a novel approach towards utilizing the bacteria producing IAA through tryptophan-dependent and -independent pathways for their promise as biostimulants in wheat.

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confidence: 99%