植物向日性の物理化学的研究 : I. インドール酢酸の光分解について

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The authors studied on the sensitized photolysis of indole-3-acetic acid (IAA), which plays an important role in plant phototropism, with following experimental results: 1. The sensitized photolysis of IAA by blue light is observed in the presence of the fluorescent yellow dyes, such as Riboflavin, Trypaflavin and Acridine Yellow. 2. β-carotin, the supposed sensitizer in vivo, is not able to sensitze the photolysis of IAA in vitro. 3. The sensitizing effect depends on the fluorescent state of the dyes, because the 1/I_F〜1/Is and 1/k〜1/Is curves are linear. I^<-1>, CNS^<-1>, (NH_2)_2CS and 2,4-dinitrophenol quench the fluorescence of Riboflavin and inhibit the photolysis of IAA. These results may be explained by the dependence of the fluolescent state (e. g. the excited state) rather on the triplet state, than on the excited singlet state of Riboflavin. 4. Semiquinoid form of Riboflavin is formed by the addition of IAA into the saturated solution of Riboflavin, as well as by the addition of Tryptophan, while the semiquinoid form is not observed in IAA-Riboflavin system at the concentration of 10^<-4>〜10^<-5> mole・1^<-1>. This fact shows that the effect of semiquinoid, electron transfar, of Riboflavin is neglegible, if any, in IAA-Riboflavin system at the low concentration. 5. In the etiolated pea, the existence of an inhibiting substance to the sensitzed photolysis of IAA by Riboflavin is confirmed, whch is a strong quencher of the fluorescence of Riboflavin, and is an organic compound containing nitrogen and sulfur.
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植物向日性の物理化学的研究 : I. インドール酢酸の光分解について

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