空间特殊环境诱致玉米突变体的分析

以7个玉米自交系种子为材料，做空间条件诱变处理。主要诱变因素是宇宙辐射和微重力。处理与未处理对照种子，在北京和三亚一年两次种植，至今已经是Sp9～Sp11。从Sp2～Sp3中筛选到11种突变体(Mutl-Mutll)，包括株高、抗大小斑病，叶平伸，穗长，多穗性，籽粒类型变异等5种突变类型。空间诱变处理具有诱变谱宽的特点。对诱变主要因素作了分析和讨论，认为空间诱变致突变最可能是微重力和空间辐射两种因素综合作用的结果。

Analysis on Mutant in Maize induced by Space Special Environment

In our previous paper it has been described that the space flight of maize seeds has significant influence on its photosynthetic pigment contents and young leaf ultrastructure (Zea mays L.).This paper deals with the different mutant types of space induced variation and their distribution in maize. Mutants obtained from Sp2(second generation by space treatment) to Sp3 show that amplitude of variability for space induced variations is large enough. Five type mutants for space induced variation are obtained,they are:1)Special high plant and dwarf plant mutants,resistance to B.maydis and E.turcicum all;2)Leaf-blade mutant;3)ear length mutant;4)multi-ear mutant;5)kernel type mutant.Eleven mutants are obtained,i.e.Mut1,Mut2,Mut3,Mut4,Mut5,Mut6,Mut7,Mut8,Mut9,Mut10,Mut11 etc.Mutant element probrem are discussed.