By using the conventional microscopic technique, the ultrastructure of the nucleolar fibrillar centers of common wheat, onion, broad bean and soybean were studied. It was showed that the two types of fibrillar centers (FCs) "homogeneous" and "heterogeneous" presented in all of the root-tip meristematic cell nucleoli of the four plants. And it was more clearly in the root-tip meristematic cell nucleoli of common wheat stained by "en bloc" silver staining technique. The results demonstrated: (1) The two types of fibrillar centers are common in higher plants; (2) The silver nitrate could stain not only the active chromatins but the inactive ones.

The Drosophila kismet (kis) gene is a member of the trithorax group of homeotic gene activators. kis plays a dual role during Drosophila development as a transcriptional activator and as a transcriptional repressor. The kis gene encodes multiple, large nuclear proteins that are related to chromatin remodeling factors, including Brahma (BRM) (another member of the trithorax group) and dMi-2. To study interactions between KIS and its target genes, we looked at its distribution on salivary gland polytene chromosomes. KIS is associated with a number of sites on polytene chromosomes suggesting that it regulates a large number of Abstracts/R

用常规电镜和整体银染电镜观察技术对小麦根端分生组织细胞核进行了研究，发现核仁与其周边染色质之间存在通道结构。初步分析认为，染色体NORS中的rDNA是通过该通道进入到核仁的纤维中心的。

本文以小麦为材料，对其根端分生组织细胞核进行了整体硝酸银染色，在电镜下观察发现，间期核中核仁的染色很深，几个基本结构完整，除此之外，间期集缩染色质和中期染色体上也分布有大量细小的、染色浅的银染颗粒。我们的结果表明，硝酸银除了对核仁有较高的亲和性外，还能与间期集缩染色质和中期染色体中的某些蛋白质相结合。

采用光棘豆无菌苗胚轴诱导的分化能力强的愈伤组织建立的胚性细胞悬浮系材料，对悬浮细胞原生质体解离所需酶液、原生质体培养所需要的渗透压和激素组合进行了研究。发现较低的培养基渗透压（<0.35mol/L 葡萄糖）和较高浓度的2，4-D（>1mg/L）易于诱导细胞出芽分裂，导致细胞破碎和死亡，并引起培养细胞褐化。找出了适合光棘豆悬浮细胞原生质体培养的培养基渗透压和激素组合。