稻馬鹿苗病菌の生化学-21・22-

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In Part 21, the reaction of ultra-violet ray against the physiological activity of gibberellin was examined. The activity of gibberellin was determined by measuring the heights of the steals of young rice seedlings which were germinated and cultured from the seeds treated with gibberellin. The result was as follows, although it could not be shown so quantitatively: By irradiation of ultra-violet ray during 60 minutes, the physiological activity of gibberellin disappeared quitely in the 0.0002% solution and decreasd to about a half in the 0.0004% solution. In Part 22, rice seedlings were cultured by treating with or without gibberellin and general components of these seedlings were analyzed quantitatively in conparison with the control. The analytical results of young seedlings treated with gibberellin were as follows: The stem is taller and the root is shorter than these of the control but there was not so great a difference between total weights. Also, we could not find so great a difference between moisture, ash and total nitorgen contents. But the quantity of total carbohydrate was found to be smaller, although the quantity of reducing sugar was the same. The chlorophyll content was also found to be smaller distinctly but was not so smaller as to be expected from their external appearance with much thinner and. lighter green color.
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