National Science Council of R.o.c.

Su May Yu

Ming Tsair Chan

Li Fei Liu

The present invention is directed to a method for producing a gene product by expressing a gene encoding the gene product in angiosperm host cells, comprising the steps of constructing a vector expressible in angiosperm host cells, the vector comprising a promoter region derived from an .alpha.-amylase gene of a plant, and a gene encoding a desired gene product; transforming a compatible angiosperm host cell with the vector; cultivating the resultant transformant host cell; subjecting the cultivated transformant host cell to a sugar-depleted or sugar-free condition to promote the expression of the gene under the control of the promoter region; and recovering the expressed gene product. The present invention also is directed to a method for the production of a transgenic plant of rice crop comprising the steps of infecting an immature embryo of rice crop with the genus Agrobacterium for transformation; co-culturing the infected embryo with a dicot suspension culture during the step of transformation; allowing the transformed embryo to grow into a callus in a selective medium comprising a sufficient amount of a plant growth hormone for the growth of rice crop; and allowing the cultured callus to regenerate root and shoot in a regeneration medium comprising a pre-determined amount of nutrients for the growth of rice crop. The invention is further directed to a transformed rice plant made by methods of this invention.

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Taipei, Taiwan

Su May Yu