de Bruijn F J, Szabados L, Schell J
Max-Plank-Institut für Züchtungsforschung, Köln, Federal Republic of Germany.
Dev Genet. 1990;11(3):182-96. doi: 10.1002/dvg.1020110304.
Nodulin genes are plant genes specifically activated during the formation of nitrogen-fixing nodules on leguminous plants. These genes are interesting to study since they are not only induced in a specific developmental fashion by signals coming directly or indirectly from the rhizobial symbiont, but are also expressed in a tissue-specific manner. By examining the expression of chimeric nodulin-reporter genes in transgenic legume plants it has been shown that nodule specific expression is mediated by DNA sequences present in the 5 upstream region of several nodulin genes. Here we summarize the available data on these cis-acting elements and the trans-acting factors interacting with them. We also review experiments designed to identify rhizobial "signals" which may play a role in nodule specific gene expression.
结瘤素基因是豆科植物在形成固氮根瘤过程中特异性激活的植物基因。研究这些基因很有意思，因为它们不仅以特定的发育方式由直接或间接来自根瘤菌共生体的信号诱导，而且还以组织特异性方式表达。通过检测转基因豆科植物中嵌合结瘤素-报告基因的表达，已表明根瘤特异性表达是由几个结瘤素基因5'上游区域存在的DNA序列介导的。在此，我们总结了关于这些顺式作用元件以及与它们相互作用的反式作用因子的现有数据。我们还回顾了旨在鉴定可能在根瘤特异性基因表达中起作用的根瘤菌“信号”的实验。
