| 摘要 |
Disclosed are isolated .beta.-amyrin synthase-encoding cDNA and gDNA nucleic acids. The genes are involved in saponin synthesis. One preferred embodiment is the nucleotide sequence which encodes the polypeptide of Annex II. Also provided are variant sequences (e.g. alleles, derivatives) and complementary sequences, plus vectors, host cells, plants, polypeptides, and associated processes of production and methods of use e.g. for influencing or affecting triterpene synsthesis, and hence the resistance to a fungal pathogen, taste, palatability or nutritional value of the plant. Also provided is the .beta.- amyrin synthase promoter sequence and variants and uses thereof.
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