激动素增强生长素诱导乙烯生成的协同作用机制：抑制生长素结合。
Mechanism of a Synergistic Effect of Kinetin on Auxin-induced Ethylene Production: Suppression of Auxin Conjugation.
机构信息
Department of Vegetable Crops, University of California, Davis, California 95616.
出版信息
Plant Physiol. 1973 Jun;51(6):1011-4. doi: 10.1104/pp.51.6.1011.
Abstract
In hypocotyl segments of mung bean (Phaseolus mungo L.) seedlings, exogenously supplied indoleacetic acid was rapidly conjugated mainly into indoleacetylaspartic acid, which was inactive in inducing ethylene production. Kinetin is known to stimulate indoleacetic acid-induced ethylene production. The mechanism of kinetin action on indoleacetic acid-induced ethylene production by hypocotyl segments of mung bean seedlings was studied in relation to indoleacetic acid uptake and indoleacetic acid metabolism. Kinetin enhanced indoleacetic acid uptake during the initial 2-hour incubation and markedly suppressed the conversion of indoleacetic acid to indoleacetic acid conjugates throughout the whole 7-hour incubation. As a result, there was more free indoleacetic acid and less conjugated indoleacetic acid in the segments treated with kinetin than in those receiving no kinetin. A close relationship was demonstrated between the rate of ethylene production and the level of free indoleacetic acid, which was regulated by kinetin.
摘要
在绿豆（Phaseolus mungo L.）幼苗下胚轴切段中，外源供应的吲哚乙酸主要迅速与天冬氨酸结合形成吲哚乙酰天冬氨酸，该物质不具有诱导乙烯生成的活性。已知激动素可刺激吲哚乙酸诱导的乙烯生成。本研究以绿豆幼苗下胚轴切段为材料，探讨了激动素对吲哚乙酸诱导乙烯生成的作用机制与吲哚乙酸的摄取和代谢的关系。激动素增强了在下胚轴切段最初 2 小时孵育过程中的吲哚乙酸摄取，并在整个 7 小时孵育过程中显著抑制了吲哚乙酸向吲哚乙酸结合物的转化。因此，用激动素处理的片段中游离的吲哚乙酸较多，而结合的吲哚乙酸较少。证明了乙烯生成速率与游离吲哚乙酸水平之间存在密切关系，而后者受到激动素的调节。
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本文引用的文献
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Mechanism of Auxin-induced Ethylene Production.生长素诱导乙烯生成的机制。
Plant Physiol. 1971 Apr;47(4):504-9. doi: 10.1104/pp.47.4.504.
2
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