...术；大豆；幼苗；子叶节区；初生维管系统； [gap=722]Key words: optical microscopy; soybean; seedlings; cotyledon node zone; primary vascular system; ...
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And cotyledon node zone could be divided into three parts:upper,middle and lower.
子叶节区又分为上、中、下三部分。
参考来源 - 四种药用植物根的发育解剖学研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The anatomical structure of its primary vascular system was studied and its cotyledon node zone is longer than that of Ranonculaceae.
其初生维管系统的解剖学研究表明：子叶节区明显长于毛茛科植物幼苗，属顶枝伸长型。
After making an anatomic study on the primary vascular system of their seedlings based on the theory and method of cotyledon node zone.
根据子叶节区理论和方法对胡萝卜幼苗初生维管系统进行了解剖学研究。
The lower part of its cotyledon node zone is cotyledon node zone-root transition region, and its upper part is cotyledon node zone-stem connection region.
在子叶节区下部存在子叶节区—根过渡区；子叶节区上部存在子叶节区—茎连接区。
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