SYMBIOTIC INDUCTION OF A MADS-BOX GENE DURING DEVELOPMENT OF ALFALFA ROOT-NODULES
SYMBIOTIC INDUCTION OF A MADS-BOX GENE DURING DEVELOPMENT OF ALFALFA ROOT-NODULES
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DOI：
10.1073/pnas.92.12.5273
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发表时间：
1995-06-06
影响因子：
11.1
通讯作者：
DUNN, K
中科院分区：
文献类型：
--
作者：
HEARD, J;DUNN, K
在根瘤菌侵染下，豆科植物根部形成高度分化的器官，称为根瘤。在这些器官中，寄主植物与细菌之间建立了共生关系。在苜蓿根瘤中发现了一种推测的植物转录因子NMH7。nmh7含有一个MADS-box dna结合区，与花同源基因具有同源性。该基因是苜蓿多基因家族中的一员，通过与Antirrhinum和Arabidopsis植物调控蛋白基因（mads -box- containing genes）的核酸同源性鉴定。RNA分析和原位杂交表明，这类调控基因的表达仅限于苜蓿根瘤的感染细胞，并可能参与细菌共生体根瘤菌meliloti启动的信号转导途径。在根源器官中表达nmh7是这类调控基因的不寻常之处。
In response to infection by Rhizobium, highly differentiated organs called nodules form on legume roots, Within these organs, the symbiotic association between the host plant and bacteria is established, A putative plant transcription factor, NMH7, has been identified in alfalfa root nodules. nmh7 contains a MADS-box DNA-binding region and shows homology to flower homeotic genes. This gene is a member of a multigene family in alfalfa and was identified on the basis of nucleic acid homology to plant regulatory protein genes (MADS-box-cantaining genes) from Antirrhinum and Arabidopsis. RNA analysis and in situ hybridization showed that expression of this class of regulatory genes is limited to the infected cells of alfalfa root nodules and is likely to be involved in the signal transduction pathway initiated by the bacterial symbiont, Rhizobium meliloti, The expression of nmh7 in a root-derived organ is unusual for this class of regulatory genes.