金属离子诱导玉米初生根弯曲的比较有效性
Comparative effectiveness of metal ions in inducing curvature of primary roots of Zea mays.
作者信息
Hasenstein K H, Evans M L, Stinemetz C L, Moore R, Fondren W M, Koon E C, Higby M A, Smucker A J
机构信息
Department of Botany, Ohio State University, Columbus 43210, USA.
出版信息
Plant Physiol. 1988;86(3):885-9. doi: 10.1104/pp.86.3.885.
We used five cultivars of Zea mays (Bear Hybrid WF9 * 38MS, B73 * Missouri 17, Yellow Dent, Merit, and Great Lakes Hybrid 422) to reinvestigate the specificity of metal ions for inducing root curvature. Of 17 cations tested, 6 (Al3+, Ba2+, Ca2+, Cd2+, Cu2+, Zn2+) induced curvature. Roots curved away from Al3+, Ba2+, and Cd2+. Roots curved away from low (0.1 millimolar) concentrations of Cu2+ but toward higher (1-5 millimolar) concentrations. Roots initially curved away from Zn2+ but the direction of the subsequent curvature was unpredictable. In most cases, roots of all cultivars curved towards calcium. However, in some tests there was no response to calcium or even (especially in the cultivars Merit and B73 * Missouri 17) substantial curvature away from calcium. The results indicate that the induction of root curvature is not specific for calcium. The results are discussed relative to the possible role of calmodulin as a mediator of ion-induced root curvature.
我们使用了5个玉米品种（熊杂交种WF9 * 38MS、B73 * 密苏里17、黄马齿型、优点和大湖杂交种422）来重新研究金属离子诱导根弯曲的特异性。在测试的17种阳离子中，有6种（Al3+、Ba2+、Ca2+、Cd2+、Cu2+、Zn2+）能诱导根弯曲。根向远离Al3+、Ba2+和Cd2+的方向弯曲。根向远离低浓度（0.1毫摩尔）Cu2+的方向弯曲，但向高浓度（1 - 5毫摩尔）的方向弯曲。根最初向远离Zn2+的方向弯曲，但随后弯曲的方向无法预测。在大多数情况下，所有品种的根都向钙弯曲。然而，在一些测试中，对钙没有反应，甚至（特别是在优点和B73 * 密苏里17品种中）根向远离钙的方向大幅弯曲。结果表明，根弯曲的诱导并非对钙具有特异性。本文将结合钙调蛋白作为离子诱导根弯曲的介质的可能作用来讨论这些结果。
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