P-10 タマネギの鱗茎形成を阻害する内生因子(ポスター発表の部)

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The onion plants form spherical bulbs under long-day condition. It is clarified that the bulb formation is a result of swelling of leaf sheath cells, not cell division. Also, it is believed that bulb formation is controlled by endogenous bulbing and anti-bulbing hormones, for which auxin and gibbrellin are candidates, respectively. But, it is not confirmed if the hypothesis is true or not. Recently, we developed a bioassay system to measure the bulbing and anti-bulbing activities. Using this system, bulbing and anti-bulbing activities were detected in water- and hexane-soluble fractions in onion leaves, respectively. The level of anti-bulbing activity in hexane fraction changed greatly during the course of the growth of the plant. The level that was high in early stage of plant growth reduced largely with the commencement of bulb formation, and increased again with the completion of bulb formation. The result seems to indicate that bulb formation was controlled by endogenous hormonal factor. Linolenic and linolic acids were isolated as anti-bulbing substances. Because onion leaves contained relatively high amount of these fatty acids (total 3×10^<-4>M), it is possible that these acids function as endogenous anti-bulbing hormone. Furthermore, we found that chemical modification of carboxyl moiety of linolenic acid was insensitive to anti-bulbing activity as a result of structure-activity correlation study. We would like to clarify the molecular mechanism of bulb formation in onion plants using modified linolates with anti-bulbing activity.
天然有機化合物討論会の論文
2006-09-15

P-10 タマネギの鱗茎形成を阻害する内生因子(ポスター発表の部)

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