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Volume 29 (1964)
- Issue 5 Pages 229-
- Issue 4 Pages 175-
- Issue 3 Pages 103-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 29, Issue 4
Displaying 1-10 of 10 articles from this issue
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Masa-akira HORI1964 Volume 29 Issue 4 Pages 175-179
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
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Hiroshi KITAJIMA1964 Volume 29 Issue 4 Pages 180-181
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
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Yoshio OTANI1964 Volume 29 Issue 4 Pages 182-184
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
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(X) Further experiments on the transmission by leafhopper, Hishimonus disciguttus Walker.-1Yasuo TAHAMA1964 Volume 29 Issue 4 Pages 185-188
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1. In the transmission experiments of mulberry dwarf virus by adults of lozenge-marked leafhopper, Hishimonus disciguttus Walker, the rate of transmission by the leafhoppers captured at Taimei village, Kumamoto Prefecture was 48 percent, whereas the leafhoppers from Kikuchi city in the same Prefecture induced 17 percent transmission.
2. The rate of transmission by nymphs of the leafhopper was 3 percent.
3. In the serial transmission by each adult of leafhoppers, it was found that the leafhoppers were able to transmit the virus more readily at the later transmission stages than at the early stages of infection feeding.View full abstractDownload PDF (488K) -
On abscission induced by fungicidesKouhei KOMIYA, Tadao MISAWA1964 Volume 29 Issue 4 Pages 189-198
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESSA physiological study was made of the abscission of leaf as induced by chemical injury to the leaf blade. Experiments were carried out with young trees of deciduous, rosaceous fruit-trees in 7 species, grown in the field. One percent aq. solution of phenyl mercuric acetate or of cupric sulfate was swabbed on a given part of the leaf blade to injure the leaf. Results obtained are as follows:
1. Leaf abscission was accelerated by injury of the leaf blade due to chemicals more highly than either by killing of the leaf-blade by dipping its upper half in hot water, or by removal of the entire blade from the petiole.
2. Leaf blade injuried by chemicals stimulated defoliation more than excision of leaf blade of the equal area. Injuried area of leaf blade, covering 20 percent of the leaf length, sufficed to cause abscission of the leaf.
3. Application of chemicals to any part of the leaf blade revealed to be more effective for causing abscission, than excision of leaf blade. Particularly, abscission occurred rapidly, when the chemicals were applied along the midrib, or to the lower half of the leaf blade.
4. Influence of the treatments, such as girdling of shoot or cutting the leaf trace, that would affect the movement of substances from other leaves, was examined on the abscission due to chemical injury. The girdling showed a retarding effect, and cutting leaf trace was found slightly accelerating, in relation to defoliation induced by chemical poisoning.
5. Results of experiments, in which the portion of leaf blade, treated with chemicals, was cut off periodically, showed that keeping the treated blade undetached until browning appeared, led to subsequent abscission of the leaf.
6. From the results above, it was considered that in the leaf abscission of rosaceous fruit-tress induced by chemical injury, certain abscission-stimulating factors may be formed in the leaf tissue at the site of injury or its neighbourhood. The abscission-stimulating factors seem to be produced in sufficient amount to induce abscission, during the course of reaction from discoloring to browning in the poisoned tissue of treated leaf. Presumably, the factors are translocated mainly through the midrib, from the poisoned area of the blade to the base of petiole.View full abstractDownload PDF (1582K) -
Yasuo KOMURO, Takeshi KAWADA, Yasuke HIRANO, Masumi MUROKI1964 Volume 29 Issue 4 Pages 199-205
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1) Potato plants (variety Wheeler) showing yellow blotching of the leaves (Fig. 1 and 2) were found at Yatsugatake National Potato Foundation Seed Farm, Chino, Nagano Prefecture, in August 1962. There was no apparent tuber necrosis.
2) By mechanical inoculation from these potato plants, a virus was transmitted to potato, broad bean, bean, cowpea, tomato, cucumber, tobacco, etc. From the host range and symptoms on these plants, the virus was identified with alfalfa mosaic virus.
3) The virus was tuber-perpetuated and graft-transmissible; also readily transmitted by Myzus persicae or Aphis gossypii from diseased broad bean or tobacco to healthy broad bean or tobacco. There was no transmission from diseased ladino clover or potato to healthy potato plants by Myzus persicae, Aphis gossypii, Macrosiphum euphorbiae and Aulacorthum solani.
4) The thermal inactivation point of the virus was 55∼60°C; dilution end point, 5, 000∼10, 000; and longevity in vitro, 1∼2 days.
5) In order to determine whether potato plants carry the virus without symptom, leaf extract from each of 130 apparently healthy potato plants (var. Wheeler) was mechanically inoculated to bean, broad bean or cowpea. There was no indication of the presence of virus.
6) In the vicinity of the potato fields, there were many ladino clover plants with yellow-patch symptom. The virus isolated from yellow-patch ladino clover was found to be same or closely related to the potato strain in respect to host range and physical properties.View full abstractDownload PDF (3109K) -
Itaru ISHII, Tomomasa MISATO1964 Volume 29 Issue 4 Pages 206-209
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1. When Piricularia oryzae was grown in the medium containing glucose alone as a carbon source, it was found that the carbohydrate of the mycelium was composed of glucose and its noncellulose polymer.
2. Effects of Blasticidin S (BcS) and 2, 4-dinitrophenol on the utilization of glucose by P. oryzae were investigated. The growth-inhibitory concentration of BcS (1.0μg/ml) caused an accumulation of 70 percent ethanol-soluble polysaccharide in the mycelial cells and inhibited completely the synthesis of 70 percent ethanol-insoluble polysaccharide.
3. The effect of BcS on glucose utilization was not altered by the addition of L-glutamic acid in the medium. Although the rates of oxygen uptake and glucose utilization by the mycelium treated with BcS were low, the rates were maintained undecreased during 4 hours' incubation in medium. In contrast, the rate of utilization of L-glutamic acid remained unchanged in the first 2 hours' incubation as compared with that by non-treated mycelium, but, after that time, no further utilization was found until 4 hours' incubation.View full abstractDownload PDF (610K) -
1. Soil conditions as predisposing factors for blast and bacterial leaf blight of rice plant1964 Volume 29 Issue 4 Pages 210-214
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
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1964 Volume 29 Issue 4 Pages 214-218
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
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1964 Volume 29 Issue 4 Pages 218-223
Published: September 30, 1964
Released on J-STAGE: February 19, 2009
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