INTERACTION BETWEEN HELIANGINE AND PYRIMIDINES IN ADVENTITIOUS ROOT FORMATION OF PHASEOLUS CUTTINGS |
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Authors: | SHIBAOKA HIROH; ANZAI TADASHI; MITSUHASHI MIEKO; SHIMOKORIYAMA MASAMI |
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Institution: | Botanical Gardens, Faculty of Science, University of Tokyo Tokyo and Department of Botany Faculty of Science, University of Tokyo Tokyo |
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Abstract: | - Heliangine at 1104 M promoted the adventitious rootformation in hypocotyls of cuttings taken from light-grown (1,900lux) Phaseolus mungo seedlings. The promotion was almost completelyreversed by 3104 M uracil, uridine, cytidine, oroticacid or 6104 M carbamoyl DL-aspartic acid, and partlyby 3104 M thymine or thymidine. Neither 3104M cytosine, adenine, adenosine, guanine, guanosine nor a combinationof 3104 M carbamoyl phosphate and 3104 M L-asparticacid reduced the promotion by heliangine.
- Uracil did not reducethe inhibiting effect of heliangine onthe indoleacetic acidinduced elongation of etiolated Avenacoleoptile sections.
- Helianginein an aqueous uracil solution was recovered unchangedafter24-hr incubation at room temperature.
- The root formation ofPhaseolus cuttings was promoted also by2-thiouracil and 5-fluorouracil.The effect was reversed byorotic acid or carbamoyl asparticacid, but not by carbamoylphosphate plus aspartic acid.
- Ribonucleaseat 100 µg/ml increased the number of rootsprotruded fromhypocotyls of cuttings by about 260%.
- A possible interpretationfor the promotion of root formationby heliangine is offered.
1 Contribution No. 15 from the Botanical Gardens, Faculty ofScience, University of Tokyo, Tokyo, Japan.
2 Dedicated to Prof. Dr. H. SODING in commemoration of the 70thbirthday. |
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