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；
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.
伴胞为与筛管分子等长的一列或单个细胞。
Companion cells arrange in a row or single cell as long as the sieve tube member.
吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的，管胞的分化先于筛管，或同时进行。
The tracheid and sieve tube elements are all differentiated from the procambia in the center of the haustoria, and the former occurs prior to the latter.
吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的，管胞的分化先于筛管，或同时进行。
The tracheid and sieve tube elements are all differentiated from the procambia in the center of the haustoria, and the former occurs prior to the latter.
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