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Gene Review

Never-ripe  -  ethylene receptor

Solanum lycopersicum

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Disease relevance of Never-ripe


High impact information on Never-ripe


Chemical compound and disease context of Never-ripe

  • We compared ethylene's role in plant response to virulent and avirulent strains of Xanthomonas campestris pv. vesicatoria in tomato (Lycopersicon esculentum Mill.). The ethylene-insensitive Never ripe (Nr) mutant displays increased tolerance to the virulent strain, while maintaining resistance to the avirulent strain [1].

Biological context of Never-ripe

  • A double mutant (epi/epi;Nr/Nr) homozygous for both the recessive epi and dominant ethylene-insensitive Never-ripe loci has the same dark-grown seedling and vegetative phenotypes as epi but possesses the senescence and ripening characteristics of Never-ripe [7].


  1. Response to Xanthomonas campestris pv. vesicatoria in tomato involves regulation of ethylene receptor gene expression. Ciardi, J.A., Tieman, D.M., Lund, S.T., Jones, J.B., Stall, R.E., Klee, H.J. Plant Physiol. (2000) [Pubmed]
  2. Delayed abscission and shorter Internodes correlate with a reduction in the ethylene receptor LeETR1 transcript in transgenic tomato. Whitelaw, C.A., Lyssenko, N.N., Chen, L., Zhou, D., Mattoo, A.K., Tucker, M.L. Plant Physiol. (2002) [Pubmed]
  3. An ethylene-inducible component of signal transduction encoded by never-ripe. Wilkinson, J.Q., Lanahan, M.B., Yen, H.C., Giovannoni, J.J., Klee, H.J. Science (1995) [Pubmed]
  4. Regulation of ethylene biosynthesis in response to pollination in tomato flowers. Llop-Tous, I., Barry, C.S., Grierson, D. Plant Physiol. (2000) [Pubmed]
  5. Differential expression and internal feedback regulation of 1-aminocyclopropane-1-carboxylate synthase, 1-aminocyclopropane-1-carboxylate oxidase, and ethylene receptor genes in tomato fruit during development and ripening. Nakatsuka, A., Murachi, S., Okunishi, H., Shiomi, S., Nakano, R., Kubo, Y., Inaba, A. Plant Physiol. (1998) [Pubmed]
  6. The tomato ethylene receptor LE-ETR3 (NR) is not involved in mediating ozone sensitivity: causal relationships among ethylene emission, oxidative burst and tissue damage. Castagna, A., Ederli, L., Pasqualini, S., Mensuali-Sodi, A., Baldan, B., Donnini, S., Ranieri, A. New Phytol. (2007) [Pubmed]
  7. Analysis of the ethylene response in the epinastic mutant of tomato. Barry, C.S., Fox, E.A., Yen, H., Lee, S., Ying, T., Grierson, D., Giovannoni, J.J. Plant Physiol. (2001) [Pubmed]
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