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Volume 2, Issue 1
Displaying 1-6 of 6 articles from this issue
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Seiya ITO, Kazue KURIBAYASHI1927 Volume 2 Issue 1 Pages 1-8_3
Published: July 20, 1927
Released on J-STAGE: February 19, 2009
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Takewo Hemmi1927 Volume 2 Issue 1 Pages 9-13
Published: July 20, 1927
Released on J-STAGE: February 19, 2009
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Yosikazu Nisikado1927 Volume 2 Issue 1 Pages 14-25
Published: July 20, 1927
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESS1) In this paper are given results of comparative studies on various strains of Helminthosporium Oryzae Breda de Haan, causing leaf-spot disease of rice in the Pacific regions, Compariosns were especially made between the Japanese and the American strains, which produced the spores in cultural conditions.
2) The lesions on the rice plant, produced by both the Japanese and the American strains, are similar in general appearance.
3) Both the strains show clear contrasts in the morphological characters, especially in the shape of spores. The spores of the Japanese strain are obclavate, broadest at the point of one third from the base, provided with pretty large, prominent hilum. While those of the American strain are cylindrical or fusiform, broadest at the middle part or the point of two thirds from the base, curved to one side regularly, the hilum being small and less prominent. The general shape of the spores of the latter is much more slender than the former.
4) Not only morphologically but also physiologically the both strains show differences between them.
5) The both strains were inoculated on the seedlings of about 480 varieties or strains of cultivated rice. The results show that there are no great divergence between both strains regarding the pathogenecity to the rice seedlings.
6) The above stated two strains must be regard as quite distinct forms, and may possibly be different species.View full abstractDownload PDF (2498K) -
Takewo Hemmi, Isamu Matsuura1927 Volume 2 Issue 1 Pages 26-52_1
Published: July 20, 1927
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESSRecent publications indicate that asexual mutations in fungi occur frequently on culture media. In the present paper a distinct albino mutation by a species of Brachysporium parasitic on the rice-seedlings is reported. Brachysporium is a genus of Dematiaceae, and is characterized by dark brown mycelium and conidia. The parental form under consideration was isolated from an infected seedling of the rice plant in April, 1925. Cultures were started from single spores at that time. In October of the same year we found that from the lower portion of the slant of the apricot-decoction agar in a test tube, a sector grew out which lacked the usual color character. Subcultures were made from the contrasting area of this culture, by transferring some of the white mycelium to other culture media. The conidia produced by this albino strain correspond substantially in size and shape with those of the normal strain.
Repeated single-spore isolations have been made, and these cultures remain all constant for the character of albinism, as do the cultures made by isolating bits of mycelium. Effect of temperature on the growth of the mutant and also of the parental form has been studied. But we could not find any remarkable difference between them. The optimum temperature for the growth of them seems to lie at about 28°C. In order to ascertain whether there are any differences in degree of virulence of the mutant and its parent, comparative inoculation experiments were made on the rice seedlings. The results obtain d indicate however that they have almost the same degree of virulence. In the present paper the results of our investigations on the effect of some environmental factors to the color modifications of the albino strain on the cultures are also described.View full abstractDownload PDF (3905K) -
Seito Takimoto1927 Volume 2 Issue 1 Pages 53-56
Published: July 20, 1927
Released on J-STAGE: February 19, 2009
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1927 Volume 2 Issue 1 Pages 57-61
Published: July 20, 1927
Released on J-STAGE: February 19, 2009
JOURNAL FREE ACCESSDownload PDF (520K)
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