胡瓜の雌花・雄花・両性花の分化を支配する条件の研究(第7報)

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書誌事項

タイトル別名
  • Factors responsible for the sex expression of Japanese cucumber. (VII)
  • 胡瓜の雌花・雄花・両性花の分化を支配する条件の研究-7-
  • キュウリ ノ メバナ オバナ リョウセイ カ ノ ブンカ オ シハイ スル ジョウケン ノ ケンキュウ 7
  • Effects of long day and high night temperature treatment applied for short duration at the various stages of seedling development on the sex expression of flowers

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抄録

1. Cucumber seedlings are set under long day (15hrs.) and high night temperature (30°C) treat-ment of two or four days duration at each stage of their development, for the purpose of detecting the influence of those environmental factors reflected upon the sex pattern of the flowers. In some plots, treatments are thrice or five times repeated-ly applied. A plot is set under the long day and high night temperature through the whole seedling stage.<br> Control plot is set under short day (8hrs.) and medium night temperature (20°C) through the whole seedling stage.<br> 2. Long day and high night temperature favor the staminate flower development and restrict the pistillate flower formation.<br> As the first pistillate flower of the control plant flowered at the eighth node, the adverse influence of the long day and high night temperature treat-ment reveals its effect apparently only at the higher nodes. At the lower nodes, even on the control plants, there bloomed only the staminate flowers.<br> 3. Treated at the fourth period, just when the primordia of the seventh to the tenth nodes are going to differentiate sexually, those primordia were all transformed into the staminate flowers. Even the treatment applied at the first period influenced on the sex differentiation of the primor dia of the seventh to the eighth nodes. The treatment at the second period influenced upon the sex of the primordia of the seventh to the ninth nodes. The treatment at the third period influenced upon the primbrdia of the seventh to the tenth nodes.<br> 4. The effect of the treatment of four days duration always manifested itself stronger than that of two days duration applied at the same stage.<br> 5. It seems that these environmental conditions influence the sex differentiation by inducing the physiological change around the primordia just going to differentiate sexually, being invigorated as much as the duration of the treatment elongated, or the repetition times of the treatment multiplied, and fainting as time elapses.

収録刊行物

  • 園芸学会雑誌

    園芸学会雑誌 26 (3), 149-153, 1957

    一般社団法人　園芸学会

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