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KMID : 0380219870200020117
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Journal of Biochemistry and Molecular Biology
1987 Volume.20 No. 2 p.117 ~ p.121
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Action of Lithim Lons on Ethylene Biosynthesis in Hypocotyl Segments of Vigna radiata
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Lee Myung-Sook
Kang Bin-Goo
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Abstract
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Non-osmotic concentrations of LiCl promoted ethylene production from hypocotyl segments of etiolated mung bean seedlings. Indole-3-acetic acid (IAA)-induced, as well as 1-aminocyclopropane-1-carboxylic acid (ACC)-based ethylene production was further promoted by treatment of the segments with lithium ions. Results of experiments using labelled IAA indicated that the promotive effect of Li^+ on auxininduced ethylene production was not a result of possible mediation of auxin uptake into the cell by the cation. The lithium effect on auxin-induced ethylene production was found to be reversed at high concentrations (eg. 1 mM) of added IAA. Syntheses of both protein and RNA in the tissue as measured by in vivo incorporations of ³H-leucine and ³H-uridine respectively into TCA precipitates were likewise inhibited by lithium ions. Possible sites of lithium action in the pathway of ethylene biosynthesis will be discussed.
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