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- W2034682040 abstract "We characterized five lesion-mimic mutants of rice (Oryza sativa L.), spotted leaf 5-2 (spl5-2), Spl12, spl13, spl14 and Spl15, all of which have broad-spectrum resistance to the rice blast fungus Magnaporthe grisea and the bacterial blight pathogen Xanthomonas campestris pv. oryzae. First, we analyzed the influence of gene dosage on disease resistance and lesion-mimicry. Although the frequency of lesion-mimicry was lower in heterozygous Spl12 plants than in homozygous plants, the heterozygotes had almost the same levels of resistance to rice blast and bacterial blight as the homozygotes. Second, we analyzed whether developmental regulation of disease resistance differed in dominant and recessive mutants. We inoculated leaves at different leaf positions at the heading stage with bacterial blight, and found that spl5-2 and Spl12 mutants displayed enhanced resistance in lower and upper leaves but the level of resistance was higher in the upper leaves. Furthermore, we clarified the disease resistance and lesion-mimicry by inoculating the top expanded leaves at various developmental stages with bacterial blight. The dominant mutants (Spl12 and Spl15) showed lesion-mimicry from an earlier stage than did the recessive mutants (spl5-2, spl13 and spl14); the lesion-mimicry was more severe, and their resistance was rather greater, than in the recessive mutants. Finally, we studied the phenotypes of the progeny of crosses between the spl mutants. Although the lesion-mimicry of the Spl12 spl14 double mutant was additive, the resistance phenotype of the double mutant equaled that of spl14. These results demonstrate that the mechanism by which SPL genes activate cell death and defense differs among dominant and recessive mutants." @default.
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- W2034682040 date "2003-01-01" @default.
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- W2034682040 title "Developmental Responses of Resistance to Magnaporthe grisea and Xanthomonas campestris pv. oryzae in Lesion-mimic Mutants of Rice" @default.
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- W2034682040 doi "https://doi.org/10.1270/jsbbs.53.93" @default.
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