Inhibition of Zeatin-Induced Growth of Cucumber Cotyledons by Sulfite Ions |
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Authors: | Takeuchi Yuichi; Saito Makoto; Kondo Noriaki; Sugahara Kiyoshi |
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Institution: | 1 Division of Environmental Biology, The National Institute for Environmental Studies Yatabe-machi, Tsukuba, Ibaraki 305, Japan
2 Department of Environmental Chemistry, Faculty of Science, Toho University Funabashi, Chiba 274, Japan |
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Abstract: | The inhibitory effects of sulfite ions on zeatin-induced cellexpansion in cotyledons excised from dark-grown seedlings ofcucumber (Cucumis sativus L.) were examined. With 50 µMzeatin the growth rate in white light was about twice that ofthe control. Addition of Na2SO3 in the growth medium inhibitedthe zeatin-induced growth of cotyledons. Zeatin-treatment increasedthe osmotic potential in cell sap of cotyledons, while sulfitedecreased it. These treatments had no significant effect onpotassium concentration. Sulfite inhibited the zeatin-inducedincrease in contents of fructose and glucose, but did not affectsucrose content. The relative contents of non-cellulosic constituentsof cell walls fell with the advance of culture. This decreasewas repressed by sulfite, indicating that inhibition of expansiongrowth in cucumber cotyledons by sulfite ions was the resultof alterations in the cell wall structure due to changes inthe cell wall metabolism. (Received June 12, 1984; Accepted October 24, 1984) |
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