韧皮部的输导分子是筛管(sieve tubes)panion cells),较原始的形式则为筛胞(sieve cells)。成熟的筛管和筛胞是没有细胞核的生活细胞。
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The secondary phloem consisted of sieve cells and phloem parenchymas.
根的次生韧皮部则由筛胞和韧皮薄壁细胞组成。
The ATPase activity at the plasmolemma of the sieve cells of the branches of the upper part is higher than that of the basal part.
灌浆前期，稻穗上部枝梗筛管细胞质膜上的ATP酶活性比下部强；
In the axial systems, the phloem consists of sieve cells, phloem parenchyma cells, albuminous cell and phloem fibers. In the radial systems, it consists of phloem rays.
轴向系统由筛胞、韧皮薄壁组织细胞、蛋白细胞和韧皮纤维组成，径向系统由韧皮射线组成。
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