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. 1988 Jan 11;16(1):39-50.
doi: 10.1093/nar/16.1.39.

Root nodule specific gene regulation: analysis of the soybean nodulin N23 gene promoter in heterologous symbiotic systems

J E Jørgensen  1 , J Stougaard, A Marcker, K A Marcker
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Free PMC article

Root nodule specific gene regulation: analysis of the soybean nodulin N23 gene promoter in heterologous symbiotic systems

J E Jørgensen et al. Nucleic Acids Res. .
Free PMC article

Abstract

The nodulin N23 gene promoter was analysed in transgenic plants using the chloramphenicol acetyltransferase (CAT) coding sequence as a reporter. A 5' flanking region of less than 1 kb was sufficient for the organ-specific expression of a chimeric N23-CAT-3'lbc3 gene in root nodules formed on Lotus corniculatus and Trifolium repens after infection by their respective Rhizobium symbionts. Expression was regulated at the level of RNA in both species of transgenic plants. Promoter deletion analysis defined the 5' region required for high level expression and delimited two putative regulatory sequences involved in positive control of the N23 gene in L. corniculatus.

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