大麦条纹花叶病毒在大麦植株内运转的研究

本文按常规方法制备感染有大麦条纹花叶病毒(BSMV)的大麦叶片超薄切片中,很容易观察到薄壁细胞内的BSMV颗粒。但病叶的筛管、导管和胞间连丝中从未观察到该病毒颗粒。未标记免疫酶技术的研究表明:病叶筛管里毫无例外地存在着大量的BSMV蛋白;在幼嫩的木质部和胞间连丝中,也常常能观察到BSMV蛋白;有时成熟的导管中亦充满着BSMV蛋白。这说明在BSMV所侵染的大麦植株中BSMV蛋白与植株内正常的代谢物质一样,经筛管、导管和胞间连丝转移。基于这些结果作者讨论了大麦条纹花叶病毒以核酸的形式在植林内运转的可能性。     

STUDY ON TRANSLOCATION OF BARLEY STRIPE MOSAIC VIRUS WITHIN DISEASED BARLEY PLANT

It was easy to observe the particles of barley stripe mosaic virus (BSMV) in parenchyma cells in the ultrathin sections prepared from infected barley leaves according to routine methods. But no particles of BSMV were seen in phloem xylem and plasmodesmata. The research work in which the unlabelled immunoperoxidase technique was employed indicated that there was always a large amount of BSMV proteins in sieve tubes of diseased leaves. BSMV proteins were often seen in young xylem and plasmodesmata, occasionally mature xylem was also filled with them. All these facts sugest that BSMV proteins are translocated through phloem, xylem and plasmodesmata in barley plants infected with BSMV in the same way in which normal metabolic materials are translocated in healthy barley plants.The possibility that BSMV is translocated within the diseasod barley plant in the form of nucleic acid is discussed.     

类立克次氏体的鉴定及其在系统感染小麦植株中的胞间转移

本文论述经电子显微镜观察、诊断后证明,小麦黄化卷叶病系类立克次氏体(RLO)侵染所致。病原物的形态结构及其在寄主植株内的分布具有典型的类立克次氏体特征。在寄主维管束的韧皮部、木质部均能见到RLO。导管中RLO颗粒与一些弥漫于导管中的电子致密物质关系密切,经常可见原木质部的管壁,有时是成熟的导管壁受到腐蚀而形成孔道,RLO可经这些孔道进入相邻细胞和细胞间隙。筛管中可见大量RLO,它们可以经过筛孔进入另一筛分子。RLO穿越细胞壁的位置大多在胞间连丝密集区,或纹孔区。这些地方连丝间的次生壁因RLO的侵染而消融形成孔道。少数胞间孔道与胞间连丝或纹孔无关。基于上述观察结果,对该病原物造成寄主系统感染的机制进行了讨论。     

C_（60）－PNVC光电导功能材料的形态与结构研究

用高分辨~（１３）Ｃ核磁共振技术与扫描电镜法研究了Ｃ_（６０）修饰的聚乙烯咔唑（ＰＮＶＣ）光电导功能材料。结果表明，Ｃ_（６０）与ＰＮＶＣ共混时彼此间存在快速动态电荷转移行为；Ｃ_（６０）含量对化学修饰的ＰＮＶＣ结构影响显著。最后比较了Ｃ_（６０），ＰＮＶＣ及用金属有机化学法制备Ｃ_（６０）－ＰＮＶＣ共聚物的亚微观形态结构差异。