Department of Agronomy and Range Science, University of California, Davis, California 95616.
Genetics. 1981 Jun;98(2):389-98. doi: 10.1093/genetics/98.2.389.
A wheat (Triticum aestivum L. emend Thell) disomic addition line (2n = 6x = 44), SH1-152-2, with a pair of Elytrigia pontica (Podp.) Holub 2n = 10x = 70 [syn. Agropyron elongatum (Host) P.B.] chromosomes controlling blue aleurone color was crossed with a short-statured spring wheat ;Sonora 64' (T. aestivum). Isoline pairs of blue-disomic addition lines and nonblue euploid lines were produced by selecting plants segregating for blue aleurone for 12 generations. Nineteen of 20 blue aleurone lines were 2n = 44 addition lines, and one had 2n = 42 chromosomes. Several lines of evidence showed that this line had a spontaneous translocation in which the beta arm of wheat chromosome 4A was replaced by an Elytrigia chromosome arm carrying the blue aleurone gene. The Elytrigia chromosome in SH1-152-2 appeared to be homologous with E. pontica chromosome 4el(1), which also carries the blue aleurone gene. It was concluded that the spontaneous translocation originated from simultaneous misdivision of univalents and subsequent reunion at the centromere of chromosome arm 4Aalpha with the Elytrigia chromosome arm.
小麦（Triticum aestivum L. emend Thell）的一条二体附加系（2n = 6x = 44），SH1-152-2，携带有一对控制蓝色糊粉层颜色的披碱草（Podp.）Holub 2n = 10x = 70[syn. Agropyron elongatum（Host）P.B.]染色体，与矮秆春小麦 Sonora 64'（T. aestivum）杂交。通过对 12 代分离出蓝色糊粉层的植株进行选择，产生了蓝色二体附加系和非蓝色整倍体系的等基因系对。20 条蓝色糊粉层系中的 19 条为 2n = 44 的附加系，一条为 2n = 42 的染色体。有几项证据表明，这条线发生了自发易位，其中小麦染色体 4A 的 beta 臂被携带蓝色糊粉层基因的披碱草染色体臂所取代。SH1-152-2 中的披碱草染色体似乎与携带蓝色糊粉层基因的披碱草染色体 4el(1)同源。由此推断，自发易位源于单价体的同时错误分裂，以及随后在 4Aalpha 染色体臂与披碱草染色体臂的着丝粒处的重新结合。
