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Volume 61 (1948)
- Issue 721-726 Pages 9･･･
- Issue 719-720 Pages 5･･･
- Issue 717-718 Pages 2･･･
- Issue 715-716 Pages 1･･･
Volume 61, Issue 717-718
Displaying 1-10 of 10 articles from this issue
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1948 Volume 61 Issue 717-718 Pages Cover_717-
Published: 1948
Released on J-STAGE: October 31, 2023
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Isao HURUSAWA1948 Volume 61 Issue 717-718 Pages 27-31
Published: 1948
Released on J-STAGE: June 18, 2007
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Masami Monsi1948 Volume 61 Issue 717-718 Pages 32-
Published: 1948
Released on J-STAGE: October 31, 2023
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Shunzo SUTO1948 Volume 61 Issue 717-718 Pages 33
Published: 1948
Released on J-STAGE: June 18, 2007
JOURNAL FREE ACCESSEggs of Cystophyllum sisymbrioides fertilized with sperms of Sargassum tortile developed in alkaline sea water. Some abnormal cell division and rhizoid formation followed. In normal sea water, no development was noticed.View full abstractDownload PDF (102K) -
Shunzo SUTO1948 Volume 61 Issue 717-718 Pages 34-36
Published: 1948
Released on J-STAGE: June 18, 2007
JOURNAL FREE ACCESS1. The fertilization was studied on living materials of the following fucaceous algae: Sargassum enerve, S. tortile, S. Ringgoldianum, S. serratifolium, S. Horneri, Cystophyllum sisymbrioides and Hijikia fusiforme.
2. The spermatozoids penetrate into the thick mucilaginous coat of the discharged oosphere at the portion characteristic to each species.
3. The mode of penetration in these species is the same as in Sargassum Horneri (Kunieda and Suto in 1940).
4. The spermatozoids dissolve the inner oogonial membrane as they pass through it.
5. The socalled“fertilization cone”is observed only in Sargassum tortile, not in others.
6. No parthenogenesis was observed.View full abstractDownload PDF (279K) -
Shizuo HATTORI, Kiyoshi NAKAHARA1948 Volume 61 Issue 717-718 Pages 37-38
Published: 1948
Released on J-STAGE: June 18, 2007
JOURNAL FREE ACCESSOn the trnnks of pine trees, Pinus densiflora and P. Thunbergii, there are found somewhat globular, large wooden protuberances, the formation of which is caused by the infection of a pathogenous fungus Cronartium quercuum Miyabe. During a relatively short winter period, from the middle of January to the beginning of February in Middle Japan, pale yellow, sweet watery drops are exudated from the cracks of the protuberances. This phenomenon was from an old time known and named“pine honey”by natives. The yellow colour is that of minute spermatia of the fungus, which are formed just at the exudation of sugary liquid. We have been studyiug this curious phenomenon, and found that the sweetness of the exadate is caused by two sugars, namely d-fructose and d-glucose, the amount of the former being 3.3 times that of the latter.
The absolute amount of the sugars has been estimated to be about 3.7%, though it would vary according to the duration the liquid experiences after the exudation, that is to say, to the possible evaporation, which in turn varies according to the activity of the plant. That the saccharose, as is the case with sugar maple, does not occur here, together with the fact that the fructose is the leading sugar, is noteworthy.View full abstractDownload PDF (290K) -
Hiroshi TAMIYA, Hirosi HUZISIGE, Sanae MII1948 Volume 61 Issue 717-718 Pages 39-44
Published: 1948
Released on J-STAGE: June 18, 2007
JOURNAL FREE ACCESS1) Influence of temperature on the rate of the dark reaction of photosynthesis was studied under conditions of limited CO2 supply (CO2 concentration: 1.0×10-6 mol/lit.) and of CO2 saturation at two pH values, 4.6 and 7.0.
2) By the analyses of results obtained, it was shown that the dark reaction under the condition of CO2 saturation is composed of two intermediary reactions, the activation energy of which were found to be, independent of the hydrogen ion concentration, 6 and 27kcal. respectively.
3) Of these two reaction steps, the one with smaller activation energy is retarded by increase of hydrogen ion concentration, while the other is practically insensitive to pH, at least in the region of pH 4.6-7.0.
4) The dark reaction observed under the condition of limited CO2 supply could also be analysed into two apparent intermediary steps with the activation energy of 0 and 20kcal respectively. By detailed analyses and comparison with the results obtained in the experiment with CO2 saturation, however, it was inferred that the dark reaction under the condition of limited CO2 supply may be composed of three intermediate steps, of which only one, with the apparent activation energy 0, is dependent for its velocity upon the CO2 concentration, while the other two are the same as those observed under CO2 saturated condition.
5) Considering the very small activation energy of the CO2-dependent reaction step, it was concluded that the rate of the dark reaction, at least with Chlorella and under the conditions used in the present experiment, is not limited by the diffusion process of CO2.View full abstractDownload PDF (611K) -
About the sprouting of peeled potato-tubersToshio YAMAKI1948 Volume 61 Issue 717-718 Pages 45-49
Published: 1948
Released on J-STAGE: June 18, 2007
JOURNAL FREE ACCESS1. Freshly-harvested potatoes (Benimaru or Danshyaku) will sprout if seaked in buffer solution (pH 3.5) of IAA or NAA of the physiological concentration, whereas oldly-harvested will not take place sprouting.
2. Peeling of the potatoes promotes the sprouting of both freshly-and oldly-harvested tubers, and if the peeled potatoes were treated with auxin, the sprouting is much hastened.
3. In the case of 1 and 2, it weakened the polarity of sprouting and it sprouts more than one bud in each node.
4. Both in the terminal and the lateral bud of the dormant potato-tubers not so much free auxin was observed as in the naturally sprouted tubers, and in the latter case greater amount of auxin was observed in the terminal bud than the lateral bud.
5. Auxin was increased both in the terminal and the lateral buds of the peeled or auxin- treated tubers, and this increasement is as large as the sum of the auxin obtained from the peeled and auxin-treated ones, if it is treated with auxin after the peeling.
6. The auxin of the peeled potato-tubers is neither indoleacetic acid nor traumatic acid, but it has the same effect as indoleacetic acid upon the curvature of Avena coleoptile and sprouting of potato-tubers.
7. The dormancy of the potato-tubers will be induced the inhibiting effect of the auxin precursor of the potatoes, the sprouting of dormant and on-dormant potatoes will be regulated by the auxin and its precursor, and the sprouting effect of the peeling is only taken place through the production of auxin.View full abstractDownload PDF (602K) -
1948 Volume 61 Issue 717-718 Pages 50-52
Published: 1948
Released on J-STAGE: October 31, 2023
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1948 Volume 61 Issue 717-718 Pages 54-
Published: 1948
Released on J-STAGE: May 20, 2013
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