Abstract
The disease known under the name of “Bakanae-Byo” is one of the destructive diseases of the rice-plant in Japan. Commonly the disease occurs in seed-beds, but does not kill the attacked seedlings immediately. The diseased seedlings grow somewhat abnormally, showing a taller and more slender appearance in leaves and culms than those of normal growth. Their colour becomes, therefore, yellowish-green to pale in the advanced stage. Such an abnormal growth of the aerial parts is supposed to be caused by the presence of the mycelium of a species of Fusarium in the tissue of the foot of the plants attacked.The present paper deals with the occurrence of the disease by inoculation of the causal organism and also of seemingly the same appearance of seedlings without this organism. The latter case is called “Bakanae” phenomenon in the present paper. The pathological meaning of the distinction between the “Bakanae” disease and the “Bakanae” phenomenon is discussed in detail. The summarized conclusions are briefly stated as follows.1. The “Bakanae” disease was proved to be caused by a species of Fusarium isolated from the tissues of the infested plants. According to the writer's experiments it is clear that the fungus has the power of attacking rice-seedlings germinated in perfect health, causing the characteristic overgrowth.2. The fungus in question has never shown any pathogenicity to check the growth of the seedlings, as shown by Piricularia Oryzae Br. et Cav., Helminthosporium Oryzae Brada de Haan, and Hypochnus Sasakii Shirai. On the contrary, it has rather tended to stimulate its abnormal growth.3. The filtrate of the cultured solution of the causal fungus-Knop's solution containing glucose in various percentages-was able to produce the phenomenon characteristic of the “Bakanae” disease, as recently mentioned by Kurosawa. Owing to the absence of the mycelium of the causal fungus, the writer considers it correct to call it the “Bakanae” phenomenon, as compared with the natural condition in the occurrence of the disease.4. Differing from the filtrate of the fungus in question, the filtrate of the cultured solution of Helminthosporium Oryzae Breda de Haan parasitic commonly to the leaves of the rice-plant failed to produce any overgrowth of the leaves and culms.
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Claims 4
Claim · model-written summary
A Fusarium species isolated from diseased rice caused bakanae disease and seedling overgrowth.
- Taxon
- rice-seedlings
Oryza sativae0 - Treatment
- a species of Fusariume0
- Outcome
- characteristic overgrowthe0
- Direction
- overgrowthe0
FusariumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The “Bakanae” disease was proved to be caused by a species of Fusarium isolated from the tissues of the infested plants. According to the writer's experiments it is clear that the fungus has the power of attacking rice-seedlings germinated in perfect health, causing the characteristic overgrowth.”
Claim · model-written summary
The Fusarium species did not check seedling growth and tended to stimulate abnormal growth.
- Taxon
- RICE PLANTOryza sativat0
- Outcome
- abnormal growthe0
- Direction
- stimulatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“STUDIES ON THE “BAKANAE” DISEASE OF THE RICE PLANT. I”
e0“The fungus in question has never shown any pathogenicity to check the growth of the seedlings, as shown by Piricularia Oryzae Br. et Cav., Helminthosporium Oryzae Brada de Haan, and Hypochnus Sasakii Shirai. On the contrary, it has rather tended to stimulate its abnormal growth.”
Claim · model-written summary
Filtrate from the causal Fusarium culture produced bakanae-like symptoms without mycelium.
- Taxon
- RICE PLANTOryza sativat0
- Treatment
- filtrate of the cultured solution of the causal funguse0
- Outcome
- phenomenon characteristic of the “Bakanae” diseasee0
- Direction
- producee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“STUDIES ON THE “BAKANAE” DISEASE OF THE RICE PLANT. I”
e0“The filtrate of the cultured solution of the causal fungus-Knop's solution containing glucose in various percentages-was able to produce the phenomenon characteristic of the “Bakanae” disease, as recently mentioned by Kurosawa. Owing to the absence of the mycelium of the causal fungus”
Claim · model-written summary
Culture filtrate of Helminthosporium Oryzae failed to produce overgrowth of rice leaves and culms.
- Taxon
- rice-plantOryza sativae0
- Treatment
- filtrate of the cultured solution of Helminthosporium Oryzae Breda de Haane0
- Interactor
- Helminthosporium Oryzae Breda de Haane0pathogen
- Outcome
- overgrowth of the leaves and culmse0
- Direction
- failed to producee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the filtrate of the cultured solution of Helminthosporium Oryzae Breda de Haan parasitic commonly to the leaves of the rice-plant failed to produce any overgrowth of the leaves and culms.”