Global dependence on Corn Belt Dent maize germplasm: Challenges and opportunities
Abstract Many changes affecting the management of genetic diversity occurred following recommendations made by the National Research Council in the aftermath of the Southern Leaf Corn blight epidemic of 1970–1971. New maize ( Zea mays L.) breeding programs involving both publicly and privately funded collaborators were initiated. The number and scope of international maize breeding programs increased. Changes in germplasm usage included reduced usage of Lancaster Surecrop Oh43 and Mo17 types with increased use of Iodent. In contrast, continued and significant reliance upon Iowa Stiff-Stalk Synthetic (BSSS) germplasm has persisted. The availability of exotic germplasm for potential use in U.S. maize breeding has increased. However, we could find no publicly available information confirming the recent deployment of exotic germplasm on U.S. farms. Estimated global dependence upon Corn Belt Dent (CBD) germplasm is hig...