小麦航天诱变后代的条锈病抗性变异及选择效果研究

为明确小麦航天诱变后代条锈病抗性的变异和选择效果,在甘肃陇南用系谱法对8个小麦品种的诱变后代进行了研究。结果表明,兰天10号、兰天14号、兰天17号在SP1(诱变一代)和SP2(诱变二代),PASCAL和85-173-4在SP2的群体病谱均较原品种对照发生了不显著的变异,但它们在SP1和SP2都没有出现显著的条锈病抗性突变体;郑麦9023、陇原031和DORICO在SP2均出现了显著的条锈病抗性突变系且有分离现象。8个品种的SP2和SP3(诱变三代)共获得9个显著的条锈病抗性突变系和12个显著的非条锈病抗性突变系,其中15个突变系的后代都出现了条锈病抗性的分离和变异。经过4代的选择,证明感病品种在SP2出现的抗性不显著提高株系具有一定的选择可靠性,从郑麦9023和陇原031中分别获得了抗条锈、大粒和兼抗条锈、白粉病的优良突变系。这些结果表明,航天诱变小麦种子能够引起后代条锈病抗性的丰富变异;变异可能出现在SP1、SP2或以后世代;对于感病品种在SP2出现的抗性不显著提高株系可以进行选择;不论哪一方面性状的显著突变系,一般会随世代进展出现条锈病抗性的分离和变异,都应作为抗性选择的目标对象而注意保留。     

Soluble membrane antigens of lip and cervical carcinomas: reactivity with antibody for herpesvirus nonvirion antigens

With the use of antibody for herpesvirus nonvirion antigens (not structural components of the virus) complement fixing reactivity has been shown for soluble membrane antigens separated from lip and cervical carcinomas but not for similar extracts from normal vaginal tissue or intestinal carcinoma. Neither the serum obtained from the guinea pig before hyperimmunization with the herpesvirus nonvirion antigen nor the antiserum of guinea pigs immunized with comparable uninfected cell extracts reacted with these tumor soluble membrane antigens. Since the above soluble membrane antigens could be specific markers for the presence of virus genome within the tumor cells, the findings could support an etiological role of herpesvirus in selected human malignancies.