Abstract
Oryza minuta (Poaceae family) is a tetraploid wild relative of cultivated rice with a BBCC genome. O. minuta has the potential to resist against various pathogenic diseases such as bacterial blight (BB), white backed planthopper (WBPH) and brown plant hopper (BPH). Here, we sequenced and annotated the complete mitochondrial genome of O. minuta. The mtDNA genome is 515,022 bp, containing 60 protein coding genes, 31 tRNA genes and two rRNA genes. The mitochondrial genome organization and the gene content at the nucleotide level are highly similar (89%) to that of O. rufipogon. Comparison with other related species revealed that most of the genes with known function are conserved among the Poaceae members. Similarly, O. minuta mt genome shared 24 protein-coding genes, 15 tRNA genes and 1 ribosomal RNA gene with other rice species (indica and japonica). The evolutionary relationship and phylogenetic analysis revealed that O. minuta is more closely related to O. rufipogon than to any other related species. Such studies are essential to understand the evolutionary divergence among species and analyze common gene pools to combat risks in the current scenario of a changing environment.
Highlights
In recent years, we have noticed a significant increase in the sequencing of organelle genomes, those of economically important crop plants
Mitochondrial DNA of O. minuta was assembled into a circular genome of 515,022 bp with 44% overall GC content, which is almost similar to the mtDNA of other related species (Table 1)
We reported the complete mitochondrial genome of O. minuta
Summary
We have noticed a significant increase in the sequencing of organelle genomes, those of economically important crop plants. Compared to fungi and animal mitochondrial genomes, plant mitochondrial genomes are more complex and encode a higher number of genes. These genomes play vital roles in plant development and productivity [1,2,3]. There is an unusual size variation found in seed plant mt genomes, especially within the same family [4]. Seed plant mt genomes are distinctive for their frequent insertion of foreign DNA by gene transfer [5], very low mutation
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