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Volume 15 (1950 - 195･･･
- Issue 3-4 Pages 109-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 15, Issue 3-4
Displaying 1-15 of 15 articles from this issue
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I. On the nutritional absorption of the blast disease fungus.S. TANAKA, H. KATSUKI1951 Volume 15 Issue 3-4 Pages 109-113
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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Kogo TOGASHI1951 Volume 15 Issue 3-4 Pages 114-116
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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K. GOTO, I. NAKANISHI1951 Volume 15 Issue 3-4 Pages 117-120
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1) Ear burn of barley, a new bacterial disease, appears at the upper part of a culm and its ear. Soon after the earing awns of an affected culm discolor to yellow, then light brown, at the tip. This occurs first at a side of an ear. The discolored area enlarges towards base, rapidly extending to glumes (Fig. 1). Then, the same appears on the other side, and an entire ear discolors prematurely to light brown, producing usually no or rather rarely incomplete seed grains. This early symptom on the ears is very attractive, since the discoloration proceeds amongst the field of all green. The burned ears are observed dispersed over an affected field, but it is unusual that all the culms of an individual plant are invaded.
2) On the neck of the burned ear, there is usually a longitudinal dark brown line which runs down the culm into the flag-leaf sheath. By examining the clum within the sheath, a large brown necrotic area is observed at about 2-3cm above the node, and it encircles soon the culm. From this area dark brown lines run upwards, the longest one reaching to the ear. At the centre of the necrotic area, there is usually a pit, simulating an injury by insects. It is more precisely a small transverse crack which was resulted by one side tention in earing growth of the side remained still uninvaded in that time. (Fig. 2) At the a bottom of the cavity of the culm centre just below the necrotic area, oose of somewhat viscid milky white to light yellowish color is frequently accumulated as a pus. No remarkable symptom is caught outside of the leaf sheath there. A detailed study, however, proves frequently a slight darkening of the green color at the narrower part just above or just below the nearest node of necrotic area. In a few cases, the invasion of culm appears in the sheath of subflag-leaf, but any at all further below this.
3) A milky white bacterial colony was isolated from the discoloved parts (glumes, culm). Inoculation by prick on borley resulted the disease as in nature. It is also moderately phathogenic by inoculation to wheat, very slightly to oat, but not at all to corn. As far as the authors are aware, this organism differs from other pathogenic bacteria on Graminae, as well as known species of Aplanobacter. Therefore it is concluded that this organism is new to science. It will be named as Aplanobacter Hordei n. sp.
4) The disease distributes in Prefs, Nara, Mie, and Gifu, and probably also in Prefs. Aichi and Shiga. The disease is supposed to be seedborne.View full abstractDownload PDF (3755K) -
Nobuyuki OSHIMA1951 Volume 15 Issue 3-4 Pages 121-126
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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Y. MIYAMOTO, H. INDO1951 Volume 15 Issue 3-4 Pages 127-130
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1) The irradiatation of potato tubers of var. May Queen affected with leaf roll disease by short (wave-length: 30.0m.) and ultra-short radio waves (wave-lengths: 8.9m, 36.0cm and 9.8cm) had no effect upon the virus involved.
2) The treatment of the potato tubers of var. Irish Cobbler affected with crinkle mosaic disease by short (wave-length: 30.0m) and ultra-short radio waves (wave-lengths: 8.9m., 36.0cm. and 9.8cm.) did not inactivate the virus.
3) The irradiation of the potato Y-virus in tobacco plant juice by ultra-short radio waves (wavelengths: 8.9m, 36.0cm and 9.8cm) had no lethal effect upon the virus so far as the temperature of the juice did not reach the inactivation point.View full abstractDownload PDF (13145K) -
T. FUJIKAWA, S. OZOE1951 Volume 15 Issue 3-4 Pages 131-132
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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K. SHIRAHAMA, S. MOTOHASHI1951 Volume 15 Issue 3-4 Pages 133-134
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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Yoshiya TAGAMI1951 Volume 15 Issue 3-4 Pages 135-136
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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Shusaku MORI1951 Volume 15 Issue 3-4 Pages 137-140
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1. This paper deals with the results of the writer's investigations on the influence of hydrogenion concentration upon the antagonistic action of Streptomyces allus (Strain No.5) against three species of plant disease fungi, Ophiobolus Miyabeanus, Diaporthe Batatatis and Corticium centrifugum on culture media.
2. The optimum hydrogen-ion concentration for the growth of the mycelium of Ophiobolus Miyabeanus seems to lie at pH6.2, and for that of Diaporthe Batatatis at pH5.2-6.2, but they grew slightly at pH3.0 and fairly well at pH8.6.
3. The relation of pH value of culture media to the growth of Streptomyces albus was also studied by growing the fungus on poured plates of Czapek's agar adjusted at different hydrogenion concentrations. It was found that the organism in culture media grew at the range of pH6.0 to ca. 8.6, and the optimum pH value of media for its growth seemed to lie at approximately pH7.6.
4. By using Czapek's agar medium, the effect of mix culturing three fungi with the Streptomyces at various pH values on the width of sterile region appearing around the colony of Streptomyces was studied. The inhibitor's inoculum was placed on the center of each Petri dish, and the fungus to be tested was transplanted on the place of seven centimetres away from it at the same time. The antagonistic action of streptomyces allus against the three fungi was clearly influenced by the pH value of the culture media. No antagonistic action of the inhibitory organism was shown to all the strains of Corticium centrifugum. However, the inhibition of growth of Ophiobolus Miyabeanus takes place between pH3.0 and ca. 8.6, and of Diaporthe Batatatis between pH4.0 and ca. 8.6. The optimum pH for the inhibitory action seems to lie at approximately pH6.6-7.6.
5. The activity of the antibiotic substances produced by Streptomyces allus was influenced by the pH value of culture media. It was intensive at between pH4.0 and ca. pH8.6. The maximum activity of this substance was shown at pH6.6-7.6. No sign of activity of the antibiotic substance, however, was shown at pH3.0.
6. From the result of the experiments, the writer came to the conclusion that in the practice of biologic control of crop-diseases the hydrogenion concentration in the antagonistic complex must be considered.View full abstractDownload PDF (13261K) -
T. NISHIZAWA1951 Volume 15 Issue 3-4 Pages 141-142
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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Shigetaka KATSUKI1951 Volume 15 Issue 3-4 Pages 143-145
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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1951 Volume 15 Issue 3-4 Pages 146-153
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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1951 Volume 15 Issue 3-4 Pages 153-162
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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1951 Volume 15 Issue 3-4 Pages 162-169
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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1951 Volume 15 Issue 3-4 Pages 169-179
Published: July 20, 1951
Released on J-STAGE: February 19, 2009
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