Studies were conducted from July to September, 1969 in the College of Agricultur, Korea University, Seoul, Korea to isolate the fluorescents compounds in the tubers of sweet potatoes and to discover their effects on the coleoptiles of wheat.
The variety used was the Suwon 147. The old tubers harvested on October 1968 at Suwon were sampled, and the fresh tubers were immediately treated after harvesting. The fluorescent compounds were isolated by thin-layer chromatography and detected with ultra-violet lamp. The summary of results for these studies is as follows;
Two kinds of the fluorescent compounds extracted from the fresh tubers were located at the Rf 0.74 and 0.81 on the chromatogram. Only a fluorescent spoting was discovered at Rf 0.74 on the chromatogram of extract from the old tubers.
The pieces of wheat coleoptile were promoted to increase their length when they were treated with fluorescent compounds of the Rf 0.74 from both, while the growth of coleoptiles were inhibited when they were treated with fluorescent compounds of Rf 0.81 from the new tubers.
It was shown that the spottings of Rf 0.81 disappeared as time elapsed in storage, but the another one was remained in the tubers.
The substances of Rf 0.7-0.9 extracted from the old tubers showed an increase in the length of coleoptile of wheat more than the substances extracted from the fresh tubers.
These studies should be continued to identify the fluorescent compounds for wheat and to charify their physiological effects and significance for storage value and tuber sprouting, etc.
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