This thesis explores the location and nature of the power that is deepening and broadening the revolution in modern biotechnologies, and which is inherent in the global governance of one type of genetic resource — plant genetic resources. Plant genetic resources are of increasing importance within the global political economy and ecology because of the power/knowledge networks contributing to, and responding to developments in the biotechnology sector, and concerned with the rampant erosion of biological diversity. The thesis argues that transnational norms, values and knowledge are important aspects of power. Discursive power, and particularly the power inherent in discourses of sustainable development, security and human rights, are a central focus of the thesis. The thesis challenges realist, neo-realist and other structural analyses of power which focus on relative distributions of power at the level of individual states or at the global level.