Abstract:

Cytochemical and ultrastructural studies indicated that compound spherical bodies observed near the sieve plate in the sieve tube members during the period of cambial dormancy in the shoots of Eucommia ulmoides Oliv. were polysaccharide bodies different from the polysaccharide grains in other parenchyma cells in shoots, and were similar to cell walls in their staining properties. The compound spherical bodies occurred in the sieve elements during the period of cambial rest and disappeared in the sieve elements during the period of cambial quiescence and activity.

杜仲休眠枝条中多糖颗粒变化的超微结构研究
崔克明* 罗立新 李正理
（北京大学生命科学学院，北京100871）
 

摘要：在对杜仲 (Eucommiaulmoides Oliv .)形成层休眠期枝条的超微结构研究中发现 ,在筛管分子的筛板附近有一种复合球形体。细胞化学研究证明 ,这是一种多糖颗粒 ,但不同于枝条其他薄壁细胞中的多糖颗粒 ,而与细胞壁中的多糖相似。这种复合球形体只出现于形成层生理休眠期的筛分子中 ,而在被动休眠期和活动期的筛分子中则看不到。

关键词： 超微结构；多糖颗粒；筛管分子；休眠；杜仲

Key words: ultrastructure, polysaccharide grains, sieve tube member, dormancy, Eucommia ulmoides