DESC:-As Attached- ,CLAIMS:I/We claim:

1. An isolated cDNA fragment encoding a polypeptide having amino acid sequence as set forth in SEQ ID NO: 9.
2. The isolated cDNA as claimed in claim 1, wherein the polynucleotide sequence of the cDNA is as set forth in SEQ ID NO: 8, wherein said cDNA encodes a polypeptide having sesquiterpenoid synthase activity.
3. A recombinant DNA construct comprising a cDNA fragment encoding a polypeptide having amino acid sequence as set forth in SEQ ID NO: 9, operably linked to a promoter, wherein said polypeptide has sesquiterpenoid synthase activity.
4. The recombinant DNA construct as claimed in claim 3, wherein the polynucleotide sequence of the cDNA fragment is as set forth in SEQ ID NO: 8.
5. A recombinant vector comprising a recombinant DNA construct as claimed in claim 3 or 4.
6. A recombinant host cell comprising a recombinant DNA construct as claimed in claim 3 or 4.
7. A recombinant host cell comprising a recombinant vector as claimed in claim 5.
8. The recombinant host cell as claimed in claim 6 or 7, wherein the host cell is a bacterial or a fungal cell.
9. A method of enhancing the content of a-farnesene in a plant, said method comprising:
a. transforming a plant cell with a recombinant DNA construct as claimed in claim 3 or 4 or a recombinant host cell as claimed in claim 7.
b. selecting and developing a transgenic plant with enhanced content of a-farnesene.
10. The method as claimed in claim 9, wherein the plant cell is transformed using a method selected from the group consisting of Agrobacterium mediated transformation, protoplast mediated transformation, particle gun bombardment, in-planta transformation, and liposome mediated transformation.