【摘要】 用BrdU-Giemsa法和改良的去壁低渗标本制备法,观察了小麦属5个种根尖细胞的SCE。各物种之间每条染色体的平均SCE是不同的。硬粒小麦为0.76±0.82(±S.E.),拟斯卑尔脱小麦为0.70±0.85,普通小麦为0.57±0.69,野生一粒小麦为0.48±0.60,节节麦为0.24±0.47。由于小麦属的某些种有不同的染色体组,它们的SGE的差别可能反映了不同染色体组的SCE不同,B组高于A组,A组高于D组。文章中讨论了造成这种差异的因素。 本文还研究了苯、乙醇、糖精对普通小麦的染色体畸变和SCE的影响。在本实验条件下,上述化合物能显著增加小麦的SCE,但不影响小麦的后期染色体桥的频率。更多还原

【Abstract】 The sister chromatid exchanges (SCEs) of root tip cell chromosomes in five species of Triticum have been studied with the BrdU-Giemsa method and a developed wall degradation hypotonic method of preparing mitotic.chromosomes in plant.The spontaneous SCEs per chromosome of the species are as follows:; Triticum durum Best 0.76 + 0.82 (x + S.E.),T.speltoides 0.70 + 0.85,T.aestivum 0.57 + 0.69,T.boeoticum Boiss 0.48 + 0.60,and T.tauschii 0.24 + 0.47.Sinc the cells of these five species have different genomes,the difference of SCEs in their chromosomes might be caused by that of SCEs in different genomes,i.e.the B genome is higher than A and A genome is higher than D.The factors causing these differences have been discussed.In this paper we have also dealt with the influence of benzene ethyl alcohol and sodium saccharin treatment on SCEs and chromosome bridges of T.aestivum.Under same conditions,the three chemicals induce SCEs obviously but have no effect on chromosomal bridges of anaphase or telophase cells.更多还原