Indirect response to selection for improving resistance to the Mediterranean corn borer (<Emphasis Type="Italic">Sesamia nonagrioides</Emphasis> Lef) in maize |
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Authors: | G Sandoya A Butrón R Santiago A Alvarez R A Malvar |
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Institution: | 1.Misión Biológica de Galicia, CSIC,Pontevedra,Spain;2.Estación Experimental de Aula Dei, CSIC,Zaragoza,Spain |
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Abstract: | Mediterranean corn borer (MCB) (Sesamia nonagrioides Lef) and European corn borer (ECB) (Ostrinia nubilalis Hbn) are the most important biotic stresses of maize in Europe. The first selection program to improve stalk resistance to
MCB was carried out in the maize population EPS12. It has shown that selection was effective to improve stalk resistance to
MCB and ECB, while yield was not significantly diminished. The objective of this research was to determine if correlated changes
in EPS12 occurred due to selection for resistance to MCB. Cycles of selection per se and testcrosses to three testers were
evaluated under MCB and ECB artificial infestation at two different Spanish locations during 2 years. Selection has significantly
reduced cob damage, days to silking, plant and ear height, and 100-kernel weight; meanwhile early vigor was increased. These
changes could rather be a consequence of unconscious selection and/or the genetic correlation of these traits with resistance
than a consequence of genetic drift. |
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Keywords: | |
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