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Differential expression of disease resistance in rice lesion-mimic mutants

  • Biotic and Abiotic Stress
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Abstract.

Lesion-mimic mutants are useful for investigating mechanisms of disease resistance. We have characterized five lesion-mimic mutants of rice (Oryza sativa L.): spotted leaf 5–2 (spl5–2), Spl12, spl13, spl14, and Spl15, that have broad-spectrum resistance to the rice blast fungus Magnaporthe grisea and the bacterial blight pathogen Xanthomonas campestris pv. oryzae. Autofluorescence, a sign of disease resistance response, was detected in leaf-sheath cells of the spl mutants in the absence of pathogens. In addition, three pathogenesis-related genes, PBZ1, PR1, and Cht3, were expressed in spl5–2, Spl12, and Spl15 after the appearance of lesion-mimicry. In contrast, expression of these genes in spl13 and spl14 started before lesion formation. Interestingly, in spl13 and spl14, enhanced resistance to rice blast and bacterial blight was also induced before the appearance of lesion-mimicry. These results demonstrate that disease resistance is differently expressed in the spl mutants.

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Authors and Affiliations

  1. National Agricultural Research Center for Kyushu Okinawa Region, Chikugo, Fukuoka 833–0041, Japan, , , , ,

    R. Mizobuchi,  R. Kaji &  M. Okamoto

  2. National Institute of Crop Science, Tsukuba, Ibaraki 305–8518, Japan, , , , ,

    H. Hirabayashi

  3. National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305–8602, Japan, , , , ,

    Y. Nishizawa

  4. Faculty of Agriculture, Kyushu University, Hakozaki, Fukuoka 812–0053, Japan, , , , ,

    H. Satoh

  5. National Agricultural Research Center for Western Region, Fukuyama, Hiroshima 721–8514, Japan, , , , ,

    T. Ogawa

Authors
  1. R. Mizobuchi
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  2. H. Hirabayashi
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  3. R. Kaji
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  4. Y. Nishizawa
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  5. H. Satoh
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  6. T. Ogawa
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  7. M. Okamoto
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Mizobuchi, .R., Hirabayashi, .H., Kaji, .R. et al. Differential expression of disease resistance in rice lesion-mimic mutants. Plant Cell Rep 21, 390–396 (2002). https://doi.org/10.1007/s00299-002-0525-1

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  • DOI: https://doi.org/10.1007/s00299-002-0525-1

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