Resistance breeding strategy for Stenocarpella maydis and Fusarium graminearum cob rots in tropical maize
Abstract
166 words
Maize cob rot caused by Fusarium graminearum and Stenocarpella
maydis affects grain yield and quality. The objective of this study was to
investigate the appropriateness of multiple infection as a selection and
breeding strategy for multiple resistance to F. graminearum and
S. maydis. Twelve tropical inbred lines with varying resistance to either or
both pathogens were mated in a full diallel and the progeny and their parents
evaluated for reaction to single or multiple infection. Under multiple
inoculation, S. maydis suppressed colonization of cobs by F. graminearum.
GCA effects indicated that inbred WL 110–18 effectively transmitted
resistance to both diseases. Hybrids’ resistant to S. maydis was also resistant
to F. graminearum, but the reverse was not true. Therefore, efficient
screening should initially involve screening for S. maydis followed by
F.graminearum. Overall, the suppression ofF.graminearum byS.maydis
shows that multiple infection cannot be used as an appropriate breeding
strategy to obtain multiple resistance. The use of F. graminearum and
S. maydis separately is, therefore, the best breeding strategy.
Subjects
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