タマネギのりん茎形成に関する研究 (第6報)

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タイトル別名
  • Studies on the bulb formation in onion plants
  • 長日感受苗の短日条件下における肥大
  • チョウジツ カンジュ ナエ ノ タンジツ ジョウケン カ ニ オケル ヒダイ
  • VI. Conditions determining effect of short-day on the bulbing of onion plants previously received long-day exposure

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This experiment was carried out to clarify the photoenvironmental condition of short-day on the bulbing of onion plants that previously received stimulus of long-days, using the cultivar of Kaizuka-wase.<br>1. The onion plants were daily exposed to sunlight for 8 hours, followed by supplementary incandescent light at intensity of about 1000 lux for 16 hours, and then transferred to short-day exposure.<br>2. When the 2-, 4- and 6-long-days plants, which received stimulus of long-day exposure for 2, 4 and 6 days, were grown under short-day exposure for 30 days, the 4- and 6-long-day plants began to bulb noticeably several days, but 2-long-days plants failed to bulb. The length of lag periods between stimulation and response in relation to bulbing ranged from 7 to 10 days, and the increase of bulbing-ratio was rapid between 6th and 16th day after transfer to short-day exposure (Fig. 1).<br>3. The 6-long-days plants receiving short-day exposure accumulated sugars in their leaf-sheath accompanied with bulbing, as well as the plants receiving long-day exposure (Table 1).<br>4. When 6-long-days plants were grown under 2-, 4- and 8-hours day-length, only 8 hours daylength plants continued to swell, but no bulb developed on plants exposed to less than 8-hours day-length (Table 2).<br>5. The 8-long-days plants were transferred to short-day exposure in the growth chamber with light intensities maintained 10000 (H) and 2500 (L) lux, and were exposed alternately to high and low intensities.<br>The plants previously exposed to high intensity well developed their bulb than ones previously exposed to low intensity, even in the cases that the plants received the same amount of light. After a sequence of high and low intensity the intensity of first irradiation determines whether the bulb will develop or not (Fig. 2).<br>6. Exposed to red light of 16 hours after sunlight of 8 hours, the 4-long-days plants were not suppressed their bulbing by red light, like the plant exposed to sunlight alone (Table 3).<br>7. When the 8-, 6-, 4- and 2-long-days plants were transferred to dark condition for 8, 4, 2 and 0 days, followed by 8 hours day-length, the longer the duration of darkness, the less the bulbing-ratio (bulb/neck).<br>From these results, it is assumed that the stimulus for bulbing will be extingushed or decreased by darkness or weak light.<br>8. The onion plants previously received stimulus of long-day exposure, even in short-day exposure, elongated their leaf-sheath (Table 6).

収録刊行物

  • 園芸学会雑誌

    園芸学会雑誌 40 (1), 10-16, 1971

    一般社団法人　園芸学会

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