Abstract
Six isolates of Burkholderia were obtained from rhizosphere soils of rice grown in tropical lowlands of South Assam, India. Among the identified Burkholderia isolates, SDSA-I10/1 has shown higher nitrogen fixing potential and it was selected for 16S rDNA sequencing. The isolate SDSA-I10/1 showed highest resemblance to Burkholderia caribensis MWAP84 (Y17011) and hence, identified as Burkholderia caribensis strain SDSA-I10/1 (GU372342). Inoculation of this strain improved the growth and yield parameters of rice significantly over uninoculated control plants, thus it may be used as indigenous microbial inoculant for intensive rice cropping in tropical lowlands. Key words: Burkholderia caribensis strain SDSA-I10/1, 16S rDNA sequence, biofertilizer, Diazotroph, nitrogenase activity, tropical lowland.
Highlights
The world population is increasing day by day but the expansion of land is limited
The nucleotide sequence of the 16S rDNA gene of the strain SDSA-I10/1 investigated in this experiment was deposited in the NCBI GenBank through the GenBank submission tool BankIt under accession number GU372342
The cell count of the isolate SDSA-I10/4 was higher in the lowland rice fields of Karimganj district and that of the isolate SDSA-I10/5 was higher in the lowland rice agroecosystems of Hailakandi district
Summary
Almost half of the world’s population is consuming rice (Oryza sativa L.) as the primary food grain, making it the most important food crop currently produced (Cottyn et al, 2001). To produce higher yields of rice, expensive nitrogenous fertilizers are commonly used. These are used to fulfill the nitrogen demand of rice that can be overcome partially by using biofertilizers when they are scientifically applied. Biofertilizer is important in crop farming systems because it is an inexpensive source of nitrogen for the higher yields of crops. This process diminishes the need for expensive chemical fertilizer. The extensive use of biofertilizers would provide economic benefits to farmers improve the socio-economic condition of people and preserve natural resources
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