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Recurrent selection for corn earworm resistance in three corn synthetics

AuthorsButrón Gómez, Ana María ; Widstrom, N. W.; Snook, M. E.; Wiseman, B. R.
KeywordsZea mays
Corn earworm
Insect resistance
Issue Date2000
PublisherConsiglio per la ricerca e la sperimentazione in agricoltura (Italia)
CitationMaydica 45: 295-300 (2000)
AbstractCorn (Zea mays L.) grown in the Southeastern U. S. is often severely damaged by corn earworm (Helicoverpa zea Boddie), which feed on developing kernels on the ear. Natural resistance to this insect due to husk cover and chemicals in the silks has been identified. we studied the improvement in the resistance to ear injury by the corn earworm in the population 10LDDSR after 10 cycles of S1 recurrent selection and in the population cross DDSA x DDSB after seven cycles of reciprocal recurrent selection. We evaluated progress for increased resistance over a two-year period. The linear response to selection for improved resistance to corn earworm in the 10LDDSR population and DDSA x DDSB population cross was 0.06 cm of damage per cycle. Only three cycles of S1 and reciprocal recurrent selection for ear damage and husk tightness to improve resistance reduced ear damage by the corn earworm while maintaining other desirable agronomic traits. Therefore, future efforts to reduce ear damage in 10LDDSR(C3) should probably be focused on increasing silk maysin content. Antibiosis is also proposed as a potential trait to improve the resistance of breeding populations DDSA(C3) and DDSB(C3).
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