植物学雑誌
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
70 巻, 831 号
選択された号の論文の5件中1~5を表示しています
  • 深沢 広祐, 三藤 勝弘, 藤原 正信
    1957 年 70 巻 831 号 p. 251-257
    発行日: 1957年
    公開日: 2006/12/05
    ジャーナル フリー
    1) The present report deals with the preliminary investigations of the influence of sugar supply upon the pollen formation in wheat, in order to find a method of preventing pollen degeneration in cytoplasmic male-sterile anthers.
    2) When young stalked spikes of normal wheat plant (T. durum) were cut off at the meiotic stage and placed in the dark, all microspores became abortive. Adding of sugars, especially 5% sucrose, to the culture medium protected the pollen grains from degeneration, yielding good pollen almost to the same extent as in the normal plant growing in the field.
    3) When a male-sterile durum plant (stalked spikes) was cultured in the daylight, adding of sucrose did not result in the production of good pollen grains, but some progressive features of pollen development were observed in cytological investigation.
    4) Paper chromatography was used for the survey of sugars in male-sterile and normal wheat anthers. Normal anthers showed three sopts: fructose, glucose and sucrose; while male-sterile anthers did not show the sucrose spot.
    5) From these result, it was concluded that the lack of sucrose in the plant was one of the main causes of pollen degeneration in the cytoplasmic male-sterile wheat, althought other still unknown factors might also be involved.
  • 加藤 幸雄
    1957 年 70 巻 831 号 p. 258-263
    発行日: 1957年
    公開日: 2006/12/05
    ジャーナル フリー
    The effects of naphthalene acetic acid and colchicine on the rhizoid formation in Dryopteris spore were described. The results obtained are summarized as follows:
    1. In contrast with the case of Equisetum spore, the formation of rhizoid is prevented greaty in the medium containing NAA. That is, NAA-treatment of the germinating spores prevents the formation of rhizoid from the spore, but rather promotes it from the protonema.
    2. The position of the rhizoid initiation is very irregular in the spore cultured in the medium containing NAA.
    3. The frequency of occurrence of the rhizoidal protonema is higher in the case of the colchicine treatment.
    The author wishes to express his hearty thanks to Prof. T. Shimamura who kindly examined the manuscript of the present paper.
  • 石川 茂雄
    1957 年 70 巻 831 号 p. 264-270
    発行日: 1957年
    公開日: 2006/12/05
    ジャーナル フリー
  • 石川 茂雄
    1957 年 70 巻 831 号 p. 271-275
    発行日: 1957年
    公開日: 2006/12/05
    ジャーナル フリー
    Interaction of light and temperature in germination of Nigella, typical light inhibited seeds, was investigated according to variation of presoaking time represented by number of Dp; hours. And the following results were obtained.
    1. It was confirmed that germination promoting response to weak light and inhibiting response to strong light, exist individually.
    2. Seed's response to weak promotive light at 15°C marked maximum sensitivity at Dp; 18hrs. This is a pure photochemical reaction to weak light (6×103 MKS), in which there is a fraction acting more promotively by high temperature after irradiation.
    3. No reversible relation between red and far-red was observed in Nigella's weak-light response, though it was proved by Brothwick in Lepidium and considered to be a general nature of weak light response.
    4. Inhibitive response to long time irradiation, which appears most remarkably at DP; 30hrs meant inhibitory response to far-red radiant energy. This inhibitory effect becomes null at 0°C. Then, this has not been regarded as a mere photochemical raction but a more complicated enzymatic reaction.
    5. Response to high temperature also exists separately from light response. It prevented germination strongly in earlier Dp; hrs. But, in Dp; 24-60hrs, comparatively hort time (3-6hrs) exposure to high temperature brought about 10% ncrease of germination rate.
    6. The germination rate obtained from simultaneously exposure to light and igh temperature, was equal to a total sum rate of (1) effect of high temperature temperature reaction), (2) inhibited rate of inhibitory response to long time irradiation, nd (3) promoted rate by exposure to weak light (short time radiation) at igh temperature, added to (4) the germination rate in continuous darkness.
    7. It has been clarified that each of three factors (weak-light response, strong ight response and temperature response) exists separately from the other two actors.
  • 寄着植物表
    末松 四郎
    1957 年 70 巻 831 号 p. 276-281
    発行日: 1957年
    公開日: 2006/12/05
    ジャーナル フリー
feedback
Top