INTERACTION BETWEEN HELIANGINE AND PYRIMIDINES IN ADVENTITIOUS ROOT FORMATION OF PHASEOLUS CUTTINGS

概要

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1. Heliangine at 1×10^<-4>M promoted the adventitious root formation in hypocotyls of cuttings taken from light-grown (1,900lux) Phaseolus mungo seedlings. The promotion was almost completely reversed by 3×10^<-4>M uracil, uridine, cytidine, orotic acid or 6×10^<-4>M carbamoyl DL-aspartic acid, and partly by 3×10^<-4>M thymine or thymidine. Neither 3×10^<-4>M cytosine, adenine, adenosine, guanine, guanosine nor a combination of 3×10^<-4> M carbamoyl phosphate and 3×10^<-4>M L-aspartic acid reduced the promotion by heliangine. 2. Uracil did not reduce the inhibiting effect of heliangine on the indoleacetic acid induced elongation of etiolated Avena coleoptile sections. 3. Heliangine in an aqueous uracil solution was recovered unchanged after 24-hr incubation at room temperature. 4. The root formation of Phaseolus cuttings was promoted also by 2-thiouracil and 5-fluorouracil. The effect was reversed by orotic acid or carbamoyl aspartic acid, but not by carbamoyl phosphate plus aspartic acid. 5. Ribonuclease at 100 μg/ml increased the number of roots protruded from hypocotyls of cuttings by about 260%. 6. A possible interpretation for the promotion of root formation by heliangine is offered.
日本植物生理学会の論文