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    Abscisic acid and low temperatures suppress the whole plant-specific resistance reaction of rice plants to the infection of Magnaporthe grisea

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    Abstract
    The susceptibility of rice plants to the rice blast fungus Magnaporthe grisea is increased by cold stress. However, the mechanism of this phenomenon is unknown. In this study, we found that the whole plant-specific resistance (WPSR), which was expressed in the intact leaf sheaths of susceptible rice plants, was suppressed by low temperature or abscisic acid (ABA) treatment. An inhibitor of ABA biosynthesis prevented the suppression of WPSR by low temperature treatment. These results indicate that ABA synthesized de novo under low temperature condition is a key factor for suppressing WPSR and making rice plants susceptible to M. grisea.
    Article Outline
    1. Introduction
    2. Materials and methods
    2.1. Plants and fungi
    2.2. Fungal inoculation, symptom observation, and cytological observation
    2.3. Plant age
    2.4. Low temperature treatment
    2.5. ABA treatment
    2.6. Fluridone treatment
    3. Results
    3.1. Effect of plant age on the expression of WPSR
    3.2. Low temperature treatment suppressed the expression of WPSR but not HR
    3.3. Exogenous ABA suppressed the expression of WPSR but not HR
    3.4. Fluridone prevented the suppression of WPSR by low temperature treatment
    4. Discussion
    Acknowledgements
    References
     

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    作者:Koga, Hironori, Dohi, Koji, Mori, Masashi 来源:Elsevier 发布时间:2011年07月13日