小麦種子の発芽程度による塩素酸カリ抗毒性の変化について

抄録

According to Dr. YAMASAKI the resistance of germinating seeds of wheat varieties to the toxic action of KClO₃ shows a close relation with their physiological characters, i. e., cold resistance and spring versus winter type. The present study was made to determine the best stages of germination for testing the toxic resistance of varieties concerned. Seeds of winter wheat (Nishimura) were rendered to germinate at 20°C every 6 hours for 60 hours with a view to obtaining germinated seeds of various growth stages. Those germinated seeds and dormant seeds were treated at the same time with 0.6 % KClO₃ solution at 20°C for 20 hours, and then, after being washed with water, were grown with water in the laboratory. The resistance to KClO₃ toxicity was tested by comparing the coleoptyle length after treatment with that treated with pure water (control). It wasfound as the result that the further the germination had proceeded, the lower became the resisting capacity to the toxicity. (cf. fig. 1) On the other hand, the contents of reducing sugar and reduced ascorbic acid which are considered, as had been reported by Dr. YAMASAKI, to reduce KClO₃ to make KClO (severe poison to plants), in the germinated seeds of various growth stages were determined. The results showed that they increased rapidly up to about 4 days after seeding, and then tended to decrease slowly (cf. table 2). Here, it is interesting to note that the decrease of the resistance to the toxicant of germinated seeds along their growth stage meets well with the increase of the abovementioned substances. Accordingly, attention must be paid in testing of resistance to KClO₃ toxicity, to employ germinated seeds with coleoptyles about 5 to 10 mm in length, in order to obtain clearer results. (Received April. 4, 1954)