Strobel G A, Hess W M
Department of Plant Pathology, Montana State University, Bozeman 59717, USA.
Scanning Microsc. 1996;10(4):1111-26.
Scanning electron microscopy, when applied to the surfaces of the needles of Taxus spp. (yew) revealed features that appear useful in the taxonomy of this tree species which yields the important anticancer drug, taxol. For instance, all of the four North American species have 3-5 rows of stomata on one-half of the abaxial leaf surface, whereas all of the others, including those from Europe and Asia, have 7-10 rows of stomata. The appearance of individual or fused papilliform epidermal cells and their arrangement on the leaf surface also is a feature that varies between species. Patterns of wax formation appeared on all species of yew examined but none could characteristically be assigned to a given species. Wax pattern variation was dependent upon age, environment, and probably to some extent, species differences. This study may provide some additional useful and reliable indicators in Taxus taxonomy.
扫描电子显微镜应用于红豆杉属植物（紫杉）针叶表面时，揭示了一些特征，这些特征似乎有助于该树种的分类，该树种能产出重要的抗癌药物紫杉醇。例如，所有四种北美红豆杉属植物在叶背表面的一半有3 - 5排气孔，而其他所有种类，包括来自欧洲和亚洲的种类，有7 - 10排气孔。单个或融合的乳头状表皮细胞的外观及其在叶表面的排列也是不同物种间存在差异的一个特征。在所检查的所有红豆杉属植物种类上都出现了蜡质形成模式，但没有一种模式能明确归属于某一特定物种。蜡质模式的变化取决于年龄、环境，可能在一定程度上还取决于物种差异。这项研究可能会为红豆杉属植物的分类提供一些额外有用且可靠的指标。
