Effects of ferulic acid, an allelopathic compound, on net P, K, and water uptake by cucumber seedlings in a split-root system
Effects of ferulic acid, an allelopathic compound, on net P, K, and water uptake by cucumber seedlings in a split-root system
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DOI：
10.1007/bf01017466
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发表时间：
1990-08
影响因子：
2.3
通讯作者：
Seung-Won Lyu;U. Blum
中科院分区：
文献类型：
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作者：
Seung-Won Lyu;U. Blum
由于化感化合物在土壤中的分布变化很大，因此此类化合物的有害作用应与根部接触的频率有关。进行实验以确定随着根部与阿魏酸（FA）接触的比例的增加，黄瓜幼苗的磷、钾和水分吸收受到怎样的影响。幼苗在 Hoagland 营养液中生长 14 天，然后转移到 0.5 mM CaSO4 溶液中 24 小时，然后放入分根培养系统中。系统中的容器装有浓度为 0.5 mM 的 KH2PO4 和 CaSO4 或浓度为 0.5 mM 的 KH2PO4、CaSO4 和阿魏酸 (FA)。随着与 FA 接触的根部比例的增加，幼苗对磷的净吸收量（毫克/幼苗）以曲线（凹面）方式下降。随着与 FA 接触的根部比例的增加，幼苗对 K（每株幼苗的毫克数）和水（每株幼苗的毫升数）的净吸收量呈线性下降。当整个根系暴露于 FA 时，幼苗对磷、钾和水的净吸收分别减少了 57%、75% 和 29%。随着与 FA 接触的根部比例的增加，未与 FA 接触的根部的净 P 和 K 吸收量（毫克/克根部鲜重）分别以线性和曲线（凸）方式下降。与阿魏酸接触的根的净磷和钾吸收量分别以线性和曲线（凸）方式增加。随着根与 FA 接触频率的增加，未与 FA 接触的根的净水吸收量（毫升/克根鲜重）以曲线（凹）方式增加。与 FA 接触的根系的净吸水量没有表现出趋势。随着与 FA 接触的根部比例的增加，蒸腾量（毫升每平方厘米）呈线性减少。观察到未与 FA 接触的根对与 FA 接触的根的净吸水率有非常轻微的补偿。没有观察到磷和钾吸收率的补偿。
Since distribution of allelopathic compounds in soils is highly variable, injurious effects by such compounds should be related to the frequency of contact with roots. Experiments were conducted to determine how P, K, and water uptake of cucumber seedlings were affected as the fraction of roots in contact with ferulic acid (FA) was increased. Seedlings were grown in Hoagland's nutrient solution for 14 days and then transferred to 0.5 mM CaSO4solution for 24 hr before being placed into a split-root culture system. The containers in the system were filled with 0.5 mM concentrations of KH2PO4and CaSO4or 0.5 mM concentrations of KH2PO4, CaSO4, and ferulic acid (FA). Net uptake of P by seedlings (milligrams per seedling) decreased in a curvilinear (concave) manner as the fraction of the roots in contact with FA increased. Net uptake of K (milligrams per seedling) and water (milliliters per seedling) by seedlings decreased linearly as the fraction of the roots in contact with FA increased. Net uptake of P, K, and water by seedlings was reduced 57, 75, and 29%, respectively, when the whole root system was exposed to FA. Net P and K uptake of roots (milligrams per gram root fresh weight) not in contact with FA decreased in a linear and curvilinear (convex) manner, respectively, as the fraction of roots in contact with FA increased. Net P and K uptake of roots in contact with ferulic acid increased in a linear and curvilinear (convex) manner, respectively. Net water uptake of roots (milliliters per gram root fresh weight) not in contact with FA increased in a curvilinear (concave) manner as the frequency of the roots in contact with FA increased. Net water uptake of roots in contact with FA did not show a trend. Transpiration (milliliters per square centimeter) was reduced in a linear manner as the fraction of roots in contact with FA increased. A very slight compensation by roots not in contact with FA for roots in contact with FA was observed for net water uptake rates. No compensation for P and K uptake rates was observed.