The present disclosure provides, a DNA construct comprising a polynucleotide fragment comprising a first, and a second sequence, wherein said first sequence encodes a mitochondrial transit peptide, said second sequence encodes a polypeptide having amino acid sequence as set forth in SEQ ID NO: 1, and said polynucleotide fragment is operably linked to a flower specific promoter. The present disclosure also provides with a DNA vector, a recombinant host cell and a method of obtaining the same.