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在观察根尖纵切面的构造时,一般所使用的材料是洋葱根尖纵切面的玻片标本,其优点是便当,轮廓清楚,各部分的区分较明显,但由于经过加工,经过处理,大部分的根毛已折断,只遗留下一些残余。同时有些学校由于条件设备的限制,到目前为止,还没有大量的玻片标本,因此在做这个实验时,或多或少地会遇到一些困难。而根尖的构造在植物体的营养器官——根中所占的位置是比较重要的,为了使学生证实课堂上所获得的理性知识,建立起一个完整的概念,做好此次实验完全是有必要的。最近我们根据H.C.伏罗宁著的“植物解剖学及形态学实验”O.A.加什科娃著的“普通植物学实习”以及易萨音著的“植物学实习上册”的材料,利用小麦幼苗的根尖,来观察根尖的外部形态及内部构造,效果良好。现把我们的操作方法与步骤、心得与体会总结于后,以供有关教师参考。
In the observation of root tip longitudinal section of the structure, the material used is generally onion root longitudinal section of the slide specimens, the advantages of lunch, clear outline of the distinction between the more obvious, but because of processing, processing, large Some of the root hair has been broken, leaving only some residual. At the same time, some schools have so far failed to have a large number of slide specimens due to the limitations of their condition and equipment, so some difficulties are encountered more or less during the experiment. The structure of root tip in vegetative organs - the root of the root position is more important, in order to enable students to confirm the rational knowledge gained in the classroom, to establish a complete concept, the experiment is completely Necessary. Recently, according to HC Voronin’s “Plant Anatomy and Morphology Experiment” by OA Gashkova “Ordinary Botany Intern” and Ersanne’s “Botany Intern” material, the use of wheat seedlings Root tip, to observe the outer shape of the apical and internal structure, the effect is good. Now our method of operation and steps, experience and experience summarized later, for the reference of the teachers.