Discusses and explains the major advances that the new technology of applying molecular genetic techniques of modifying carbon and nitrogen in plants has provided, giving insights into its applications for the benefits of agriculture, the environment and man. The text is divided into three sections, the first focusing on primary nitrogen and carbon assimilation and carbon partitioning; the second looking at compartmentation, transport and whole plant interactions; and the third to related metabolism to provide a comprehensive and up-to-date account of this subject.