• Title/Summary/Keyword: pre-and postdisposing temperature

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Effect of Temperature Treatments on the Penetration and Disease Development in the Leaf Epidermis by the Rice Blast Fungus, Pyricularia oryzae Cavara II. Difference in Percent Penetration, Hyphal Growth and Lesion Formation by Pre­ and Postdisposing Temperatures (기온변동이 벼 도열병균의 엽신에의 침입과 발병에 미치는 영향 II. 접종전 및 접종시의 온도처리에 의한 침입$\cdot$균사신전$\cdot$병반형성 차이)

  • Kim Chang Kyu;Mogi Shizuo
    • Korean Journal Plant Pathology
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    • v.1 no.2
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    • pp.122-127
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    • 1985

  • Three rice cultivars, Aichi-asahi, Toyotama and Yamabiko, possessing a resistance gene $Pi-\alpha$ were evaluated for penetration, hyphal growth in the leaf epidermis and lesion formation using 6 isolates of Pyricularia oryzae by treating pre- and post disposing temperatures of $23/15^{\circ}C\;and\;29/21^{\circ}C$ (day/night) regimes, respectively. Percent penetration of the fungus was higher on the seedlings disposed at $29/21^{\circ}C$ regime and more lesions were formed at 7 days after inoculation than at $23/15^{\circ}C$ regime. Degree of hyphal growth and number of host cells with hyphal growth were remarkably increased from 72 to 96 hr after inoculation at $29/21^{\circ}C$ regime. However, lesion formation on the seedlings disposed at $23/15^{\circ}C$ regime was delayed, possibly as a result of the suppressed hyphal growth until 96 hr after inoculation.

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