...sive into xylem N、P、K, Mg等养分主要以质流的方 式通过共质体(symplast)途径运输；运输 过程中，有部分养分进入液胞(Vacuole)； Ca、Si、Na、Fe（？）主要通过质 外体(poplast)途径运输。
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液胞化细胞中的质膜内陷数量多，体积增大。
The vacuolated cells had larger and more invaginating plasmalemma than those in the meristemate cells.
即存在于液胞中的酚类物质与存在于细胞质中的PPO和POD接触而引起酶促褐变。
Namely, the phenol compound in the vacuole contacting with PPO and the POD in the cytoplasm caused enzyme catalyse Browning.
它们体积细小，细胞质浓，细胞核大，无大液胞，细胞壁薄，具有较多粒线体和核糖体，能不断进行细胞分裂。
They are usually small, with dense protoplasm, large central nucleus and few vacuoles. Their cell walls are thin and without secondary deposits. They have large Numbers of mitochondria and ribosomes.
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