根系是植物的重要组成部分，是植物生长发育、新陈代谢的主要营养器官。
Root is one of the most important components of plant, also is the main alimentative organ of growth and metabolism.
同种植物不同器官的组织由于组成分的差异，提取RNA的方法也存在不同的难点。
Because different tissues of same plant species differ in component composition, RNA extraction methods have different nodi.
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