チューリップの垂下球 (dropper) に関する研究(第2報)

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タイトル別名
  • Studies on the dropper of tulip bulbs. (II)
  • チューリップの垂下球(dropper)に関する研究-2-
  • チューリップ ノ スイカキュウ dropper ニ カンスル ケンキュウ 2
  • Developmental process and morphology of dropper in small bulb

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抄録

1. In order to make the growth mechanism of dropper of tulip bulbs clear, 4 gram seed bulbs of Kansas and William Pitt were planted in October and their morphology were investigated at regular intervals.<br> 2. It was difficult to recognize any symptom of the dropper from appearance or on examination of the section of the bulbs with the naked eye before the planting time, but in early December after two months since then the bulbs were harvested and examined, it was found that of the ones which would produce a normal type daughter bulb in each mother bulb, the primordia of inner bulb was situated in the center of the nose of the bulb, whereas of the bulbs which would produce the dropper, there was a hump in which the primordia of inner bulb was produced eccentrically on the side wall of the nose as shown in Fig. 1.<br> 3. It was ascertained that the hump of nose which would develop into the dropper stalk was located on the opposite side of the point where the seed bulb attached oneself to its mother bulb in the previous year, and the hump (dropper), pushed its way through the scale beside the disk, elongated vertically down the ground, and produced a bulb on its tip. (Fig. 1. 2. 3.)<br> 4. The dropper stalk has a meristem on its tip, where the daughter bulb was originated, and as its meristem produces new cells actively and sends them backward, the dropper stalk makes its way rapidly into the earth with the base of the daughter bulb at the head as in the case of peanut's gyno-phore, <br> On the other hand, it is confirmed that the dropper stalk has the geotropism in its growing stage, because when it was harvested and kept horizontally in moisture condition, it bents its tip downward.<br> 5. The morphology of the dropper stalk is quite similar to the basal part of the leaf stalk, that is, its center is hollow as shown in Fig. 5, and its wall has not the same thickness, namely the side where it was attached to its mother bulb is thicker than the other side.<br> Some vascular bundles run through the dropper stalk to the base of the daughter bulb in its tip, from the leaf and others from the disk of seed bulb.

収録刊行物

  • 園芸学会雑誌

    園芸学会雑誌 28 (1), 52-58, 1959

    一般社団法人　園芸学会

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