From landrace to hybrid: Strategies for the use of source populations and lines in the development of drought tolerant cultivars
1997
Beck, D.L. | Betran, F.J. | Banziger, M. | Willcox, M. | Edmeades, G.O.
Significant yield reductions caused by drought are common occurrences in maize production fields throughout the world. Although breeding efforts aimed at developing drought-tolerant cultivars are justified in many of these regions, the complexity of the task and the scarcity of resources are often prohibitive. This paper will present principles learned and give an account of germplasm developed, based on our experience with drought-tolerant breeding at CIMMYT. Strategies discussed leading to more efficient development of drought tolerant cultivars include: (a) field management of drought stress; (b) source population development; (c) utilization and introgression of "exotic" drought tolerant sources; (d) appropriate recurrent selection schemes; (e) use of secondary traits and selection indices; (f) line development; and (g) hybrid formation and testing.
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