The method is based on „whiskers“ prepared from potassium titanate. Genetic material used for transformation is added to such whiskers which by means of ultrasound integrate with high efficiency into the germ plasm of Para rubber, the rubber tree. As a systematic proof, the fluorescent protein gene from Chiridius poppei, a marine plankton, was introduced and expressed at high level.
http://www.inplanta.jp/en.html
Implanta innovations lecture at 36th Japan Plant Cell Molecular Biology Society held in Kanazawa City, August 26 to 28, 2018
Implanta Innovations and Sumitomo Rubber: improved procedure for rubber tree genetic transformation