Abstract
A genomic clone (Ext 1.4) encoding an extensin was isolated from a Nicotiana tabacum genomic library. The encoded polypeptide showed features characteristic of extensins such as Ser-(Pro)4 repeats and a high content in Tyr and Lys residues. The presence of one Tyr-Leu-Tyr-Lys motif suggests the possibility for one intramolecular isodityrosine cross-link whereas numerous Val-Tyr-Lys motifs may participate in intermolecular cross-links. This extensin appears to be close to an extensin already characterized in N. tabacum but very different from the Ext 1.2 extensin of N. sylvestris. The analysis of genomic DNA gel blots using probes spanning different parts of the gene showed that the Ext 1.4 gene belongs to a complex multigene family having one member originating from N. sylvestris and three members from N. tomentosiformis. The Ext 1.4 specific probe found a 1.4 kb mRNA in stems, roots, ovaries and germinating seeds of healthy plants. The Ext 1.4 gene family is strongly induced in actively dividing cell suspension cultures and after wounding of leaves or stems in conditions where root formation occurs. On the contrary, it is not induced in leaves in response to a hyperensitive reaction to a viral infection or after elicitor treatment.
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Hirsinger, C., Parmentier, Y., Durr, A. et al. Characterization of a tobacco extensin gene and regulation of its gene family in healthy plants and under various stress conditions. Plant Mol Biol 33, 279–289 (1997). https://doi.org/10.1023/A:1005738815383
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DOI: https://doi.org/10.1023/A:1005738815383