Abstract: A saponin extract from Saponaria vaccaria and its use for stimulating apoptosis in cancer cells and treating cancer is described. The saponin extract may be isolated from Saponaria vaccaria seed. The saponin extract may comprise one or more than one triterpene saponin. The triterpene saponin may comprise a bisdesmosidic saponin having a molecular weight selected from the group consisting of molecular weight 1448, 1464, 1422, 1526, 1596 and 1688. Bisdesmosidic saponin of molecular weight 1448, 1464, 1422, 1526, 1596 and 1688 isolated from Saponaria vaccaria seed may be used to treat human cancer including prostate cancer, human breast cancer and colon cancer. Also disclosed is a method of isolating the saponin extract.

Abstract: The present invention relates to methods to control the spread of recombinant DNA molecules between sexually compatible plants of differing genetic composition. The invention describes the production of transgenic plants that comprise recombinant traits of interest or concern linked to repressible lethal genes. The lethal genes are blocked by the action of repressor molecules produced by the expression of repressor genes located at a different genetic locus. The lethal phenotype is only expressed after the segregation of the repressible lethal gene construct and the repressor gene following meiosis. The present invention may be employed for both open-pollinated and hybrid seed production systems and may be used to maintain genetic purity by blocking unintended introgression of genes from plants devoid of the specific repressor gene.

Abstract: Genetic constructs, transformation vectors and methods are taught for production of transgenic plants which can be selectively removed from a growing site by application of a chemical agent or physiological stress. The invention links a target gene for the trait of commercial interest to a conditionally lethal gene, which can be selectively expressed to cause plant death. By use of the genetic constructs, transformation vectors and methods of the present invention, invasion of environments and contamination of commercial non-engineered productions by transgenic plants can be avoided. Methods are also taught for transformation of Brassica species.