以下为句子列表：
英文: In cultivated Salvia miltiorrhiza roots, light-colored periderm contained less layers of cells and low ratio of phloem to xylem, compared with those in wild Salvia rniltiorrhiza roots.
中文: 栽培丹参根的周皮细胞层数少、色淡，韧皮部与木质部比值小，而野生丹参根的周皮细胞层数多、颜色重，韧皮部与木质部比值大。
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英文: Thickness of upper and lower epidermis of leaves, width of xylem and phloem of annual and biennial branches, ratio of late wood to early wood, periderm thickness of biennial branches, and length of xylem ray present decreasing trends with latitude ascendi
中文: 叶的上下表皮厚度、1和2年生枝木质部及韧皮部宽度、晚材／早材比值、2年生枝的周皮厚度、木射线长等均随纬度升高而呈下降趋势；而叶的栅栏组织和海绵组织比值、1年生枝表皮厚度、2年生皮层厚度等解剖结构随纬度变化没有明显规律。
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英文: Periderm is welldeveloped, - mm wide, and is divided into phellem and phelloderm.
中文: 周皮较发育,厚约~ mm,由木栓层和栓内层构成。
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英文: The phellem of periderm and special morphological structure of sweet potato “Lushu 780” and “Shengli 00” play the role of a barrier to the spread and invasion of nematodes.
中文: 甘薯品种“鲁薯780”和“胜利百号”的周皮木栓层和一些特殊形态结构是阻止该线虫侵入和扩展的屏障。
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英文: The periderm was composed of new phellem, older phellem and the cortex which was pressed by both new and older layers of phellem .
中文: 周皮由新木栓层、旧木栓层以及新旧木栓层之间被挤压的皮层等颓废组织组成。 初步推测,杜仲树皮的变异是由遗传水平上的变化引起的。
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