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• W4300408103 startingPage "604" @default.
• W4300408103 abstract "The spatio-temporal expression pattern of the Medicago truncatula ENOD20 gene during early stages of nodulation has been analyzed with transgenic alfalfa (M. varia) expressing a pMtENOD20-GUS chimeric fusion. Our results show that transcriptional activation of this gene occurs initially in dividing inner cortical cells corresponding to sites of nodule primordium formation and subsequently in root hairs containing infection threads. Use of Sinorhizobium meliloti nod gene mutants that uncouple nodule organogenesis from infection has confirmed that early MtENOD20 transcription is tightly linked to cortical cell activation (CCA). Furthermore, these experiments have revealed that an S. meliloti nodH mutant, defective in Nod factor sulfation and epidermal cell activation, is nevertheless able to elicit low-level CCA. Purified S. meliloti Nod factors trigger MtENOD20 transcription very rapidly (within 12 to 24 h) in the root cortex, and studies with transgenic alfalfa show that Nod factors are able to elicit gene expression coupled to CCA at concentrations as low as 10 -11 M. Finally, we have made use of a range of synthetic lipo-chitooligosaccharides to show that fatty acid chain length is an important structural parameter in the capacity of Nod factors to elicit CCA. Taken together, our results suggest that pMtENOD20-GUS transgenic lines should prove valuable tools in future studies of Rhizobium and Nod factor-elicited CCA." @default.
• W4300408103 created "2022-10-03" @default.
• W4300408103 creator A5009884007 @default.
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• W4300408103 date "1999-07-01" @default.
• W4300408103 modified "2023-09-27" @default.
• W4300408103 title "<i>MtENOD20</i>, a Nod Factor-Inducible Molecular Marker for Root Cortical Cell Activation" @default.
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• W4300408103 doi "https://doi.org/10.1094/mpmi.1999.12.7.604" @default.
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