Growth promoting properties of Mycobacterium and Bacillus on rice plants under induced drought

Abstract

Management of drought stress through application of plant growth promoting rhizobacteria (PGPR) is now considered as an effective strategy in the present scenario of altered environmental conditions of the world. The aims and objectives of the present investigation was isolation, characterization and identification of some potential microbial resources (PGPR) from drought-affected upland rice fields of South Bengal followed by experimentation on the effect of isolated PGPR on drought induced rice seedlings. Selected isolates were isolated from rice field rhizospheric soils and tested for their PGPR activity, through phosphate solubilization, nitrogen fixation, IAA production and ACC deaminase activity. Then, the selected isolates were identified through 16S rDNA sequencing and phylogenetic analysis. Among the screened isolates two (isolate 1 and isolate 6) showing plant growth promoting traits, was applied on studied germplasm (IR64) to find out the influence of the applied organisms on rice growth and development under induced drought. Both organisms showed a positive influence (through increase in germination percentage, root growth, shoot growth, fresh weight and dry weight) on the studied rice growth and development under induced drought. Isolate 1 and 6 identified as species of Mycobacterium sp and Bacillus sp respectively through molecular taxonomy. Hence, these two isolates are expected to alleviate drought stress in the rice field for their nature of plant growth promotion under drought stress.

Co-Inoculation of Endophytes Bacillus siamensis TUR07-02b and Priestia megaterium SMBH14-02 Promotes Growth in Rice with Low Doses of Nitrogen Fertilizer

“…The ability to fix atmospheric nitrogen has been widely reported in the genera Bacillus [ 52 , 53 ] and Burkholderia [ 54 , 55 ], as was observed in the strains studied in this work. Moreover, the ability of B. vietnamiensis to fix atmospheric nitrogen contributes minimally to its mutualistic performance with rice [ 13 ].…”

Irrigation water salinity structures the bacterial communities of date palm (Phoenix dactylifera)-associated bulk soil

“…Mycobacterium sp. are well adapted to high salinity ( Asmar et al, 2016 ) and promote plant growth ( Karmakar et al, 2021 ) in such conditions. Mycobacterium was also an indicator taxon under saline groundwater irrigation, showing an increase in arabinogalactan-peptidoglycan (cell wall) synthesis that may serve as a potential mechanism for tolerating salinity stress.…”

Okra Growth, Yield and Rhizosphere Microbiome Responses to the Encapsulated Bioinoculant Application under Reduced Fertilization Regime

“…Another important observation is that free-cell strain 40a treatment, 3HI as opposed to 3HB treatment, was strongly correlated to the increased relative abundance of Bacillus , unclassified Gaiellales, and Mycobacterium . Members of Bacillus and Mycobacterium are pronounced groups of bacteria that acquire multiple plant-beneficial traits in which their abundance in soil indicates fertile soil conditions and healthy plant physiology [ 63 , 64 ]. However, since the soil pH, SAP and SAK levels of 3HI were comparable to 3HB treatment, we priorly predicted a similar abundance and structure of the microbiome in the rhizosphere soil.…”