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Volume 16 (1952)
- Issue 3-4 Pages 97-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 16, Issue 1
Displaying 1-8 of 8 articles from this issue
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Seasonal Changes and Varietal Difference in Content of Sugars and Nitrogen Compounds in Wheat Plants under Snow-Cover.Tokuzo HIRAI, Hiroshi GOTO, Hisazi KATO, Toshiko YASUMI1952 Volume 16 Issue 1 Pages 1-5
Published: February 29, 1952
Released on J-STAGE: March 08, 2010
JOURNAL FREE ACCESSThe present paper deals with the results of the writers' experiments on the changes of the amounts of sugar and various nitrogen compounds concentrations of wheat varieties in each stages under snow-cover during three years since 1947.
The amounts of sugar concentrations decrease gradually in all varieties tested and those decreases occur suddenly after 2 months since snow-cover. The snow-resistant varieties contain more sugar concentrations than the less resistant in each stages before and after snow-cover. The ways of decreases in the amounts of reducing and non-reducing sugar concentrations have the same tendencies.
The amounts of both protein and non-protein nitrogen compounds concentrations hardly change in the initial stage of snow-cover, but the decrease of the former occurs following by the sudden decrease of sugar concentrations, and the increase of the latter begins slowly by the decomposition of protein after 2 months since snow-cover. The snow-resistant varieties have more higher ratio of protein and non-protein nitrogen compounds to the green weight than the less resistant in all stages before and after snow-cover. The changes of ammonia and amide nitrogen compounds con-centrations are irregular, but it seems to have the tendencies of increasing the amounts of ammonia nitrogen compounds in the less resistant varieties, and those of increasing the amide nitrogen compounds in the resistant under the final stage of snow-cover.
The amounts of sugar and non-protein nitrogen compounds of the snow-resistant varieties are more higher than the less resistant even before snowfall, so the amounts of the synthesized proteins are also higher in the former varieties, and they maintain these conditions in all stages under snowcover According to those facts, the mechanism of snow-damages was discussed in connection with the facts of pathological chanoes of the physical states of protoplasm in wheat cells.View full abstractDownload PDF (364K) -
Studies on the Testing of Varietal Resistance.Tomojiro KIRYU, Tadahiro NISHIZAWA, Shigeru YAMAMOTO1952 Volume 16 Issue 1 Pages 6-9
Published: February 29, 1952
Released on J-STAGE: March 08, 2010
JOURNAL FREE ACCESS1. The present paper deals with the results of the writers' investigations made in 1949, on the testing of the varietal resistance to the white tip of rice plant caused by nematode, Aphelenchoides oryzae YOKOO.
2. The resistance to the present disease is fairly different among varieties.
3. The method to test the varietal resistance to the present disease is described brieflyView full abstractDownload PDF (260K) -
Shunichi Yamada1952 Volume 16 Issue 1 Pages 10-12
Published: February 29, 1952
Released on J-STAGE: March 08, 2010
JOURNAL FREE ACCESSDownload PDF (876K) -
Syoiti HIRATA1952 Volume 16 Issue 1 Pages 13-18
Published: February 29, 1952
Released on J-STAGE: January 12, 2010
JOURNAL FREE ACCESSDownload PDF (445K) -
Minoru TAKAHASHI1952 Volume 16 Issue 1 Pages 19-22
Published: February 29, 1952
Released on J-STAGE: January 12, 2010
JOURNAL FREE ACCESS1. In the vicinity of Kyoto I have isolated two species of Pythium from water. They were identified with Pythium aphanidermatum (EDS.) FITZP. having strong pathogenicity on various plants and with P. monospermum FITZP. having no pathogenicity on living plants respectively.
2. Both fungi have some similar physiological characters. The optimum temperature for the growth of the mycelium of both fungi seems to lie at 34-36°C. They belong to the high temperature group in genus Pythium.
3. Using the corn meal agar, the relation of pH value of culture media to the mycelial growth of the two fungi was studied. The results show that the optimum hydrogen-ion concentration for the growth of P. aphanidermatum was pH6.0 and for P. monospermum was pH7.0. They grow vigorously at pH9.0 yet, but there is no growth at pH4.0.
4. When artificially inoculated, Pythium aphanidermatum forced to show the damping-off of seedlings of Cucumis sativus, Cucurbita pepo, Solanum lycopersicum, S. Melongena, Hibiscus Manihot, Pharbitus Nil, Vicia Faba f. ascendens etc. Pythium monospermum, however, did not show any injurious effect on the plants tested. Phaseolus vulgaris and Oryza sativa, when artificially inoculated with both fungi, did not show any significant symptoms. Cucurbita Pepo and Vicia Faba are more resistant than the other host plants tested.
8. As above-stated, the seedlings of Phaseolus vulgaris and Oryza sativa showed no definite symptoms, when inoculated with both fungi. The germinating seeds, however, were much affected by the laboratory conditions.
6. Generally high moisture content of soil increases the susceptibility of seedlings to fungal attack.View full abstractDownload PDF (289K) -
[in Japanese]1952 Volume 16 Issue 1 Pages 22
Published: February 29, 1952
Released on J-STAGE: January 12, 2010
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1952 Volume 16 Issue 1 Pages 23-31
Published: February 29, 1952
Released on J-STAGE: January 12, 2010
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1952 Volume 16 Issue 1 Pages 31-48
Published: February 29, 1952
Released on J-STAGE: January 12, 2010
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