皮部付傷によるクワ又枯病の病斑形成阻止作用と温度の影響

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The basal parts 20 cm long taken from 1-year-old shoots of cv Ichinose were inoculated with Stigmina mori mycelia after making a wound (1.5×1.5 mm) on the bark, then incubated at 2.5 to 30 C for various durations. Size of lesions on the inner surface of bark was measured, using the equation ; lesion size = √<length (mm) × width (mm).> The lesion could develop at 2.5 to 15 C, with the optimum temperature of 10C. No development of lesion occurred at 20C where fungal growth was the highest on PDA medium. At 10C, lesion size (Y) increased with days after inoculation (X) ; Y = 2.7 X - 4.3. No further development of lesion was observed even if shoots, which had been kept at 25 C for 1 day after inoculation, were transfered to 10 C. When shoots were wounded, kept at 5 C for 2 days or at 20 C for 1 day, then inoculated, majority of shoots failed to develop the lesion. This inhibitory effect was limited to 2-5 mm from the wound. Whereas, inhibitory effect on fungal growth in shoots disappeared completely when shoots were stored at -60 C for 60 min or at 60 C for 10 min in water bath before inoculation. Shoots having wounds and treated with 2 or 10 ppm blasticidin S (BcS) were kept at 20 C and, after various intervals, inoculated with mycella on wounds, then incubated at 10-15 C. Lesion developed in BcS-treated shoots, but falled to develop in non-treated ones. When shoots were wounded, incubated at 5 or 20 C for 0 to 24 hr, treated with 10 ppm BcS for 30 min, then incubated at 10-15 C for 4 days. Effect of BcS on lesion development was observed 12 and 4 hr after wounding at 5 and 20 C, respectively, indicating that a defence activity of wounded tissues began to appear under these conditions. The defense activity reached maximum about 24 and 8-12 hr after wounding at 5 and 20 C, respectively.
日本植物病理学会の論文
1978-04-25

皮部付傷によるクワ又枯病の病斑形成阻止作用と温度の影響

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