Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
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Volume 72, Issue 4
Displaying 1-10 of 10 articles from this issue
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Presidential Address
Lectures by the Winners of the Society Fellowship
Original
  • Bacterial spot of tea caused by Acidovorax valerianellae
    T. TOMIHAMA, T. NONAKA, M. NAKAMURA, H. IWAI, K. ARAI
    2006 Volume 72 Issue 4 Pages 185-190
    Published: 2006
    Released on J-STAGE: September 14, 2007
    DOIhttps://doi.org/10.3186/jjphytopath.72.185
    JOURNAL FREE ACCESS
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    In 2003 and 2004 years, brown spot symptoms were observed on tea leaves in tea fields in Kagoshima prefecture, mainly after typhoons. A severe incidence caused leaf fall and bud blight. A bacterium that formed a white, circular colony on King's B medium, was always isolated from lesions, and leaf symptoms of tea were reproduced after inoculation with this bacterium. Based on its bacteriological characteristics, pathogenicity on tea leaves and a 16S rRNA sequence analysis, the bacterium was identified as Acidovorax valerianellae Gardan, Stead, Dauga and Gillis 2003. This is the first report of bacterial spot of tea caused by Acidovorax valerianellae in Japan.
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Short Communications
  • Occurrence of gentian witches'-broom caused by ‘Candidatus Phytoplasma asteris’
    M. TANAKA, K. KODAMA, K. CHIBA, Y. IWADATE, T. USUGI
    2006 Volume 72 Issue 4 Pages 191-194
    Published: 2006
    Released on J-STAGE: September 14, 2007
    DOIhttps://doi.org/10.3186/jjphytopath.72.191
    JOURNAL FREE ACCESS
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    The causal phytoplasma of gentian witches'-broom, found in Iwate Prefecture in 2005, was identified phylogenetically as ‘Candidatus Phytoplasma asteris’, but not ‘Candidatus Phytoplasma pruni’, which was previously reported as the pathogen of gentian witches' broom in Japan. The causal phytoplasma was also revealed to be transmitted by Macrosteles striifrons. We propose adding ‘Candidatus Phytoplsma asteris’ to the pathogens of gentian witches'-broom.
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  • Elicitor-responses in rice cells are differentially potentiated by plant defense activators
    H. IYOZUMI, K. KATO, C. KAGEYAMA, H. INAGAKI, K. FURUSE, K. BABA, H. T ...
    2006 Volume 72 Issue 4 Pages 195-199
    Published: 2006
    Released on J-STAGE: September 14, 2007
    DOIhttps://doi.org/10.3186/jjphytopath.72.195
    JOURNAL FREE ACCESS
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    We examined the priming effects of four plant defense activators (probenazole [PBZ], methyl jasmonate [MeJA], acibenzolar-S-methyl [ASM], and carpropamid [CRP]) in rice cells. Activators potentiated the elicitor-responsive expression of Cht-1 gene by 4-to 7-fold. MeJA greatly activated PBZ1 and Os PAL1 gene expression by over 50-fold, and CRP also enhanced PBZ1 gene expression to the same degree. On the other hand, activators accelerated the elicitor-responsive photon emission and augmented its peak intensity by 2- to 3-fold. These results indicated that each elicitor response was potentiated by plant defense activators in different but overlapping manners. Among elicitor responses, photon emission can be a useful marker for priming because of its sensitivity to various kinds of activators and a simple strategy for its estimation.
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Desease Note
Abstracts of the Papers Presented at the 2006 Annual Meeting
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