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KMID : 0368419900330030197
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Journal of Plant Biology
1990 Volume.33 No. 3 p.197 ~ p.201
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Involvement of Polyamines in the Control of Senescence in Lemna gibba 63 Fronds
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Yi, Ho Chul/李浩哲
Kim, Jeong Hoe/Kang, Bin G./金政會/姜濱求
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Abstract
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Exogenously applied spermine, spermidine and putrescine caused a delay of senescence in fronds Lemma gibba G3 under continuous illumination. When the proximal half of a frond containing the meristematic "po¨ckets" was removed, endogenous spermidine level in the distal half (half frond) increased initially to a miximal level, which was followed by a decline during a period of 10 days of incubation in light. No appreciable changes were observed with putrscine or spermine levels. Treatment of fronds with α-difluromenthylarginine (DFMA) resulted in both reduced level of spermidine and enhancement of chlorophyll loss in half fronds, α-difluoromethylornithine(DFMO) was found to be virtually ineffective in either parameter rameter. Results of experiments with ABA and kinetin indicate that there is a close correlation between the progress of senescence and spermidine level in Lemma fronds under illumination. It is suggested that endogenous level of spermidine is associated, at least in part, with frond senescence in this aquatic plant.
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