苜蓿结瘤基因诱导类黄酮对含有不同nodD基因的苜蓿根瘤菌菌株中nodABC转录的影响。
Effects of alfalfa nod gene-inducing flavonoids on nodABC transcription in Rhizobium meliloti strains containing different nodD genes.
作者信息
Hartwig U A, Maxwell C A, Joseph C M, Phillips D A
机构信息
Department of Agronomy and Range Science, University of California, Davis 95616.
出版信息
J Bacteriol. 1990 May;172(5):2769-73. doi: 10.1128/jb.172.5.2769-2773.1990.
Abstract
Transcription of the nodulation genes nodABC in Rhizobium meliloti requires a plant flavonoid signal and nodD, a family of bacterial regulatory genes (nodD1, nodD2, and nodD3). Results from this study show that all previously identified nod gene inducers released by alfalfa seeds and roots induced nodABC-lacZ transcription in R. meliloti containing extra copies of nodD1, but only 4,4'-dihydroxy-2'-methoxychalcone gave high levels of induction with extra copies of nodD2. While mixtures of the methoxychalcone and luteolin showed a positive synergism with extra NodD1 protein, they apparently competed for binding to the NodD2 protein.
摘要
苜蓿根瘤菌中结瘤基因nodABC的转录需要一种植物类黄酮信号以及nodD（一类细菌调节基因，包括nodD1、nodD2和nodD3）。本研究结果表明，苜蓿种子和根释放的所有先前鉴定出的结瘤基因诱导物，均可在含有额外拷贝nodD1的苜蓿根瘤菌中诱导nodABC - lacZ转录，但只有4,4'-二羟基-2'-甲氧基查耳酮能在含有额外拷贝nodD2时产生高水平诱导。虽然甲氧基查耳酮和木犀草素的混合物与额外的NodD1蛋白表现出正协同作用，但它们显然会竞争与NodD2蛋白的结合。
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