Development and Spread of Improved Maize Varieties and Hybrids in Developing Countries

摘要

The International Maize and Wheat Improvement Center (CIMMYT) and the International Institute of Tropical Agriculture (IITA) serve as research hubs of large maize improvement networks embracing over 100 developing countries. The report documents the maize varieties, hybrids, population, pools, and lines developed for use by national research programs. Introductory sections provide background information on maize in terms of its biological characteristics and place in the world economy, as well as on the place of CIMMYT and IITA within the evolution of international germplasm development programs. The central section presents technical information on recent releases and use of improved maize materials. The report then summarizes, in terms of area planted and yield, the use of improved genotypes in the world's major regions and sub-regions. An abstract of a recent study of the yield potential of tropical hybrids in the United States is included among the appendices. Includes 6 pages of references.