玉米中 mu 突变子失活的遗传研究。
Genetic studies on the loss of mu mutator activity in maize.
机构信息
Department of Genetics, Iowa State University, Ames, Iowa 50011.
出版信息
Genetics. 1986 Jul;113(3):765-73. doi: 10.1093/genetics/113.3.765.
Mutator activity of the Mu mutator system of maize can be lost by either outcrossing or inbreeding Mu stocks. The nature of these two kinds of Mu-loss phenomena was analyzed by testing the results of crossing Mu-loss stocks by active Mu lines. Outcross- Mu-loss stocks are capable of supporting Mu activity if crossed by an active mutator line. Inbred-Mu-loss stocks, however, inactivate the active Mu system contributed by a Mu line. Also, inbred- Mu-loss lines do not regain Mu activity after at least three generations of outcrossing to non-Mu stocks. These results suggest that, once the Mu system is inactivated by inbreeding, it remains inactivated for at least three generations of outcrossing. Further, once the system responsible for inactivation is established, it will, in turn, inactivate an active Mu system contributed by crossing with Mu plants. The outcross-Mu-loss does not seem to involve such an inactivation system. These results are interpreted in the light of recent evidence that Mu inactivation results from the modification of Mu 1 transposable elements involved in the Mu phenotype.
玉米 Mu 转座子系统的突变活性可以通过杂交或自交 Mu 品系丢失。通过测试由活性 Mu 系杂交 Mu 缺失系的结果，分析了这两种 Mu 缺失现象的性质。如果由活性突变体系杂交，杂交 Mu 缺失系能够支持 Mu 活性。然而，自交 Mu 缺失系使 Mu 系贡献的活性 Mu 系统失活。此外，自交 Mu 缺失系在至少三代与非 Mu 品系杂交后不会重新获得 Mu 活性。这些结果表明，一旦 Mu 系统因自交而失活，至少在三代的杂交中它仍保持失活状态。此外，一旦建立了负责失活的系统，它将反过来使通过与 Mu 植物杂交引入的活性 Mu 系统失活。杂交 Mu 缺失似乎不涉及这种失活系统。这些结果是根据最近的证据进行解释的，即 Mu 失活是由于 Mu 1 转座元件的修饰，这些元件参与 Mu 表型。
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