植物生長素性物質の表面活性に就て

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タイトル別名
  • Surface Activity of the Plant-hormones
  • ショクブツ セイチョウ スジョウ ブッシツ ノ ヒョウメン カッセイ ニ シュウテ ショクブツ セイチョウ スジョウ ブッシツ ノ ケンキュウ 9
  • Studies on the Plant-hormones IX
  • 植物生長素性物質の研究第9報

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VELDSTRA(1) has suggested that a substance should have the following two main requirements to be active as a plant growth substance.<br> 1. A ring system with a high surface activity;<br> 2. A carboxyl group in a very definite spatial position with respect to the ring system.<br> In the previous paper (Part V) it has been reported by us that 1, 4-dihydro- and 1, 2, 3, 4-tetrahydro-naphthoic acid have strong activity to produce epinasty for tomato-plants.<br> In this paper the surface activity of these new plant hormones and substances previously known as plant-hormones have been measured by polarographic method. One example of the polarogram is shown in Fig. 1. The determination of HSV (Half Suppression Value) is shown in Figs. 3, 4 and 5. Results obtained are illustrated in Tables 2 and 3. Thus the surface activity is indicated by HSV.<br> These results suggest that the surface activity decreases in parallel with the increase of the degree of saturation of the ring system. Concerning “d” and “l” isomers, their HSV are not so different as their physiological activities. Naphthoic acid-2 derivatives, which have no physiological activity, have almost the same surface activity as the corresponding derivatives of naphthoic acid-1.<br> Therefore the physiological activity of plant growth substance does not directly depend upon the surface activity.

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