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作 者 ：叶明维

期 刊 ：植物学通报 1991年 8卷 04期 页码：40-42

关键词：构树；钟乳体毛；钟乳体；硫酸钙；二氧化硫；

摘 要 ：构树(Broussonetis Papyrifea)幼茎、芽、叶的表面具钟乳体毛。它是一长圆锥状单细胞毛，基部有无管漏斗状基座包裹，腔内有呈轮纹状沉积的钟乳体。钟乳体毛发生很早，自芽的第3幼叶(自叶原基数起)开始发生。原表皮细胞进行不均等的垂周分裂，其小的发育成表皮细胞，大的发育成钟乳体毛。基座由原表皮细胞垂周及横分裂而形成。其内钟乳体发育较迟，要等叶长至6cm，宽4—5cm时，才从毛尖或毛尖之下侧壁处开始沉积。构树钟乳体成分中含硫酸钙，这可能正是构树积累硫的速度快，净化大气中有害的SO2气体和可能抗SO2污染很强的原因。对筛选和培育抗SO2毒气更强的植物提供了参考。

Abstract:Cystolith hair of papermul berry (Broussonetia papyrifera) grown on the yong stems, buds and leaves was a longish conical cell. The base of the hair was surrounded by funnel-form basis, and annular cystolith were situated on the base. As soon as the third young leaf of the bud grew, cystolith hair appeared. The hair was formed from large proepidermal cell which was formed by anisoanticlinaly livision. The basis of hair was formed by anticlinal and crossdivision of the proepidermal cells. The hair cell was formed on the tip 8 the hair cell from the lateral cell wall of the hair cell was formed only when the leaf reached 6cm in lengh and 4 to 5cra in width. CaSO4 was one of the components in cystolith. This is because cystolith could accumulate large amount SO2 and therefore is highly resistant to SO2 pollution. The result is a useful indicator for measurment and breeding of resistant plants for SO2 pollution. And this paper contributed diraction on physiological and biochemical mechanism research on the uptake of SO2.

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