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Partial resistance to neck blast influenced by stage of panicle development and rice genotype

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Summary

Neck nodes of eight rice genotypes were inoculated with a virulent isolate of the blast pathogen at four slightly different, increasingly older stages of panicle development shortly after flowering. Resistance to infection as well as resistance to growth of the pathogen after infection was assessed. Significant differences between genotypes were found for both components of resistance. Resistance to growth of the pathogen sharply increased with aging of the neck node as was indicated by a large reduction of the length of the lesions on the culm, but resistance to infection did not change much. The lesion length was closely related to yield loss. A small delay in time of infection can lead to a large decrease in yield reduction. Meaningful comparison of partial resistance to neck blast between genotypes therefore requires infection at an identical stage of panicle development. In the field, where panicles are in different stages of development, selection of genotypes that do show the symptoms of neck blast together with relatively little yield loss in infected panicles is recommended.

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  1. Dept. of Plant Breeding, Wageningen Agricultural University, P.O. Box 386, 6700 AJ, Wageningen, The Netherlands

    E. C. Roumen

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  1. E. C. Roumen
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Roumen, E.C. Partial resistance to neck blast influenced by stage of panicle development and rice genotype. Euphytica 64, 173–182 (1992). https://doi.org/10.1007/BF00046046

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  • DOI: https://doi.org/10.1007/BF00046046

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