Mechanisms of Brown Planthopper Resistance in Mudgo Variety of Rice (Hemiptera : Delphacidae)

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Mudgo, an indica rice variety, is highly resistnat to brown planthoppers. The insects exhibited strong non-preference for this variety in greenhouse and field experiments. This reaction was evident primarily as a gustatory response and not as an alighting response. The insects caged on Mudgo had high mortality, a slow growth rate, small body size, and low fecundity. Newly emerged female planthoppers caged on Mudgo had underdeveloped ovaries that contained few mature eggs. Planthoppers did not exhibit any difficulty in inserting their stylets or reaching the vascular bundles in Mudgo plants. Stil when caged on this host they lost weight and excreted very little honeydew. These results indicated that Mudgo plants either lacked feeding stimuli or possessed one or more teste repellents for the planthoppers. The sugar content of susceptible and resistant plants was not significantly different but resistant plants contained smaller quantities of amino acids, particularly of asparagine. In separate tests, female brown planthoppers showed strong attraction to this amino acid. Thus, lower asparagine content in Mudgo is suggested as a factor of its brown planthopper resistance.
日本応用動物昆虫学会の論文