Recurrent selection for resistance to Exserohilum turcicum in eight subtropical maize populations
1991
E12468
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Title
Recurrent selection for resistance to Exserohilum turcicum in eight subtropical maize populations
Publication Date
1991
Call Number
E12468
Summary
There are few reports on the progress achieved through recurrent selection for quantitative resistance to diseases in tropical or subtropical maize populations. A study was conducted to evaluate the progress achieved after four cycles of full-sib S1 recurrent selection in eight subtropical populations from the International Maize and Wheat Improvement Center (CIMMYT). Selection was primarily for improving polygenic resistance to the northern corn leaf blight (NCLB), induced by Exserohilum turcicum [Setosphaeria turcica], and the common rust (Puccinia sorghi). Evaluations were made under three environments (high, medium and no disease pressure) each represented by two locations. A very rapid increase in resistance was obtained for both diseases (19 and 6% per cycle for NCLB and rust, respectively) without changing the maturity of the populations or reducing grain yield potential as measured by planting under relatively disease-free conditions. Under disease pressure, yield was found to be associated with resistance to NCLB (r = 0.52), reduced stalk lodging (r = -0.51) and greater number of ears per plant (r = 0.60). Results suggest high heritability values for polygenic resistance to NCLB. It was also demonstrated that the full-sib S1 recurrent selection methodology employed was highly effective in achieving the initial breeding objectives in all the populations involved.
Journal Citation
31(4):964-971, CROP SCIENCE
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles