Changes in the concentration of phenolic compounds and exudation induced by phosphate deficiency in bean plants (Phaseolus vulgaris L.)
Changes in the concentration of phenolic compounds and exudation induced by phosphate deficiency in bean plants (Phaseolus vulgaris L.)
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DOI：
10.1007/s11104-005-2569-9
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发表时间：
2004-12-01
期刊：
影响因子：
4.9
通讯作者：
Rychter, AM
中科院分区：
文献类型：
--
作者：
Juszczuk, IM;Wiktorowska, A;Rychter, AM
研究了豆类植物（Phaseolus vulgaris L.）长期磷酸盐饥饿对酚类物质浓度及其根部渗出的影响。在缺乏磷酸盐的培养基上培养的植物保持叶子中总酚类物质的稳定浓度，而在完全营养培养基上生长的植物的叶子中酚类物质的浓度下降。培养18天后。与对照叶片相比，缺乏磷酸盐的叶片中观察到总酚类物质和花青素浓度较高。磷酸盐缺乏和对照叶片之间总酚浓度的不同趋势与L-苯丙氨酸解氨酶活性的变化相对应。在根部中，与对照植物相比，缺磷植物的总酚浓度较低。然而，豆类植物培养18天后，缺磷植物根部的酚类物质渗出量是对照植物根部的5倍。缺磷植物根部的 L-苯丙氨酸解氨酶活性是其两倍。在缺氮或缺磷培养基上培养 18 天后，观察到豆根的酚类物质渗出率相当，这可能表明酚类物质释放存在类似的信号转导系统。讨论了酚类在养分吸收中的可能功能以及作为根-土壤微生物相互作用中的化学信号以增强植物对特定环境条件的适应的相关结果。
The effect of prolonged phosphate starvation of bean plants (Phaseolus vulgaris L.) on the concentration of phenolics and their exudation by roots was studied. Plants cultured on phosphate-deficient media maintained a steady concentration of total phenolics in the leaves, whereas in the leaves of plants grown on complete nutrient media the phenolic concentration decreased. After 18 days of culture. higher total phenolics and anthocyanin concentrations in phosphate-deficient leaves compared with control leaves were observed. The divergent trends in total phenolic concentrations between phosphate-deficient and control leaves corresponded to the changes in the activity of L-phenylalanine ammonia-lyase. In the roots, the concentration of total phenolics was lower in phosphate-deficient plants compared with control plants. However, after 18 days of culture of bean plants, the amount of exuded phenolics from phosphate-deficient roots was 5-times higher than that from the roots of control plants. The activity of L-phenylalanine ammonia-lyase was twice as high in the roots of phosphate-starved plants. Comparable rates in the exudation of phenolics by bean roots observed after 18 days of culture on nitrogen-deficient or phosphate-deficient medium may suggest a similar system of signal transduction for phenolics release. The results are discussed in relation to the possible functions of phenolics in nutrient uptake and as chemical signals in root-soil microbe interactions to enhance the plant adaptation to particular environmental conditions.