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Breeding Maize for Drought Tolerance in the US Corn-Belt

The objective of this review is to promote discussion on some of the key issues we consider to be involved in successful long-term genetic improvement of corn for drought tolerance. Many of the concepts have been discussed elsewhere for different crops, traits and different breeding targets. Here we focus on how to organize a comprehensive effort to enable breeding for drought tolerance in a heterogeneous target population of environments where drought is a component of the set of environmental challenges that the plant breeder has to deal with. Particular attention is given to mapping Quantitative Trait Loci (QTL) and the opportunities for their utilization in corn breeding.