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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
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Disease relevance of Cotyledon


High impact information on Cotyledon

  • Added auxin triggers oscillations in cytosolic free calcium ([Ca2+]cyt) and cytosolic pH (pHcyt) in epidermal cells of maize coleoptiles [4].
  • An auxin-binding protein (ABP) cDNA clone was selected from a lambda gt11 cDNA library from corn coleoptiles with highly purified IgGanti ABP [5].
  • We have now found, using rhodamine, peroxidase, and ferritin-labeled secondary antibodies, that WGA is located in cells and tissues that establish direct contact with the soil during germination and growth of the plant In the embryo, WGA is found in the surface layer of the radicle, the first adventitious roots, the coleoptile, and the scutellum [6].
  • Rice expansin genes show organ-specific differential expression in the coleoptile, root, leaf, and internode [7].
  • MHA2 mRNA was induced threefold when nonvascular parts of the coleoptile segments were treated with auxin [8].

Chemical compound and disease context of Cotyledon

  • In contrast, coleoptiles without exogenous glucose showed net losses of K+ and phosphates starting 12 h after anoxia was imposed and these did not recover fully when re-aerated after 60 h of anoxia [9].

Biological context of Cotyledon


Anatomical context of Cotyledon


Associations of Cotyledon with chemical compounds

  • Both action spectra match the absorption spectrum of zeaxanthin, a chloroplastic carotenoid recently implicated in blue light photoreception of both guard cells and coleoptiles [20].
  • This compound was the major product formed from [5-3H] 2-oxindole-3-acetic acid, incubated with intact plants or root and coleoptile sections [21].
  • Primary structural information of a plant aldehyde oxidase (AO), which was purified from maize coleoptiles using indole-3-acetaldehyde as a substrate, was obtained by sequencing a series of cleavage peptides, permitting the cloning of the corresponding cDNA (zmAO-1) [22].
  • Similar changes in wall plasticity and elasticity were observed in wheat (Triticum aestivum cv Pennmore Winter) coleoptile (type II) walls, which showed only a negligible extension in response to Cel12A treatment [23].
  • Auxin promoted the production of superoxide radicals (O2(-)), an OH precursor, in the growth-controlling outer epidermis of maize coleoptiles [17].

Gene context of Cotyledon

  • The gene for yptm1 is expressed at very low levels in maize coleoptiles and tissue culture cells [24].
  • We have cloned and sequenced a wound-inducible cDNA clone designated WIP1 (for wound-induced protein) from maize coleoptiles [25].
  • These structural homologies indicate that NPH1 homologues can be grouped into two classes namely "NPH1 type" and "NPL1 type". Northern blot analysis showed that OsNPH1a was strongly expressed in coleoptiles, whereas OsNPH1b was highly expressed in leaves of dark-grown rice seedlings [26].
  • In pulse-chase experiments using auxin-induced coleoptiles and an anti-ZmSAUR2 antibody we were able to precipitate a protein of the expected molecular mass and to determine a half-life of about 7 min, which is among the shortest known in eukaryotes [27].
  • The data presented here suggest that Prx7 is responsible for the biosynthesis of antifungal compounds known as hordatines, which accumulate abundantly in barley coleoptiles [28].

Analytical, diagnostic and therapeutic context of Cotyledon


  1. Restoration of phototropic responsiveness in decapitated maize coleoptiles. Kaldenhoff, R., Iino, M. Plant Physiol. (1997) [Pubmed]
  2. Cytokinin oxidase gene expression in maize is localized to the vasculature, and is induced by cytokinins, abscisic acid, and abiotic stress. Brugière, N., Jiao, S., Hantke, S., Zinselmeier, C., Roessler, J.A., Niu, X., Jones, R.J., Habben, J.E. Plant Physiol. (2003) [Pubmed]
  3. Regulation of alcoholic fermentation in coleoptiles of two rice cultivars differing in tolerance to anoxia. Gibbs, J., Morrell, S., Valdez, A., Setter, T.L., Greenway, H. J. Exp. Bot. (2000) [Pubmed]
  4. Phototropism and geotropism in maize coleoptiles are spatially correlated with increases in cytosolic free calcium. Gehring, C.A., Williams, D.A., Cody, S.H., Parish, R.W. Nature (1990) [Pubmed]
  5. cDNA clones of the auxin-binding protein from corn coleoptiles (Zea mays L.): isolation and characterization by immunological methods. Tillmann, U., Viola, G., Kayser, B., Siemeister, G., Hesse, T., Palme, K., Löbler, M., Klämbt, D. EMBO J. (1989) [Pubmed]
  6. Immunocytochemical localization of wheat germ agglutinin in wheat. Mishkind, M., Raikhel, N.V., Palevitz, B.A., Keegstra, K. J. Cell Biol. (1982) [Pubmed]
  7. Expression of expansin genes is correlated with growth in deepwater rice. Cho, H.T., Kende, H. Plant Cell (1997) [Pubmed]
  8. A major isoform of the maize plasma membrane H(+)-ATPase: characterization and induction by auxin in coleoptiles. Frías, I., Caldeira, M.T., Pérez-Castiñeira, J.R., Navarro-Aviñó, J.P., Culiañez-Maciá, F.A., Kuppinger, O., Stransky, H., Pagés, M., Hager, A., Serrano, R. Plant Cell (1996) [Pubmed]
  9. Evidence for down-regulation of ethanolic fermentation and K+ effluxes in the coleoptile of rice seedlings during prolonged anoxia. Colmer, T.D., Huang, S., Greenway, H. J. Exp. Bot. (2001) [Pubmed]
  10. The Rice COLEOPTILE PHOTOTROPISM1 gene encoding an ortholog of Arabidopsis NPH3 is required for phototropism of coleoptiles and lateral translocation of auxin. Haga, K., Takano, M., Neumann, R., Iino, M. Plant Cell (2005) [Pubmed]
  11. In vitro and in vivo protein phosphorylation in Avena sativa L. coleoptiles: effects of Ca2+, calmodulin antagonists, and auxin. Veluthambi, K., Poovaiah, B.W. Plant Physiol. (1986) [Pubmed]
  12. Physical strain-mediated microtubule reorientation in the epidermis of gravitropically or phototropically stimulated maize coleoptiles. Fischer, K., Schopfer, P. Plant J. (1998) [Pubmed]
  13. Asymmetric distribution of acetylcholinesterase in gravistimulated maize seedlings. Momonoki, Y.S. Plant Physiol. (1997) [Pubmed]
  14. Cholodny-Went revisited: a role for jasmonate in gravitropism of rice coleoptiles. Gutjahr, C., Riemann, M., Müller, A., Düchting, P., Weiler, E.W., Nick, P. Planta (2005) [Pubmed]
  15. 5'-Azido-[3,6-3H2]-1-napthylphthalamic acid, a photoactivatable probe for naphthylphthalamic acid receptor proteins from higher plants: identification of a 23-kDa protein from maize coleoptile plasma membranes. Zettl, R., Feldwisch, J., Boland, W., Schell, J., Palme, K. Proc. Natl. Acad. Sci. U.S.A. (1992) [Pubmed]
  16. Auxin-induced K+ channel expression represents an essential step in coleoptile growth and gravitropism. Philippar, K., Fuchs, I., Luthen, H., Hoth, S., Bauer, C.S., Haga, K., Thiel, G., Ljung, K., Sandberg, G., Bottger, M., Becker, D., Hedrich, R. Proc. Natl. Acad. Sci. U.S.A. (1999) [Pubmed]
  17. Hydroxyl radical-induced cell-wall loosening in vitro and in vivo: implications for the control of elongation growth. Schopfer, P. Plant J. (2001) [Pubmed]
  18. The stability of cortical microtubules depends on their orientation. Wiesler, B., Wang, Q.Y., Nick, P. Plant J. (2002) [Pubmed]
  19. A chemoreceptive bilayer lipid membrane based on an auxin-receptor ATPase electrogenic pump. Thompson, M., Krull, U.J., Venis, M.A. Biochem. Biophys. Res. Commun. (1983) [Pubmed]
  20. Close correspondence between the action spectra for the blue light responses of the guard cell and coleoptile chloroplasts, and the spectra for blue light-dependent stomatal opening and coleoptile phototropism. Quiñones, M.A., Lu, Z., Zeiger, E. Proc. Natl. Acad. Sci. U.S.A. (1996) [Pubmed]
  21. Indole-3-acetic acid catabolism in Zea mays seedlings. Metabolic conversion of oxindole-3-acetic acid to 7-hydroxy-2-oxindole-3-acetic acid 7'-O-beta-D-glucopyranoside. Nonhebel, H.M., Kruse, L.I., Bandurski, R.S. J. Biol. Chem. (1985) [Pubmed]
  22. Cloning and molecular characterization of plant aldehyde oxidase. Sekimoto, H., Seo, M., Dohmae, N., Takio, K., Kamiya, Y., Koshiba, T. J. Biol. Chem. (1997) [Pubmed]
  23. A fungal endoglucanase with plant cell wall extension activity. Yuan, S., Wu, Y., Cosgrove, D.J. Plant Physiol. (2001) [Pubmed]
  24. Molecular cloning and structural analysis of genes from Zea mays (L.) coding for members of the ras-related ypt gene family. Palme, K., Diefenthal, T., Vingron, M., Sander, C., Schell, J. Proc. Natl. Acad. Sci. U.S.A. (1992) [Pubmed]
  25. WIP1, a wound-inducible gene from maize with homology to Bowman-Birk proteinase inhibitors. Rohrmeier, T., Lehle, L. Plant Mol. Biol. (1993) [Pubmed]
  26. Rice NPH1 homologues, OsNPH1a and OsNPH1b, are differently photoregulated. Kanegae, H., Tahir, M., Savazzini, F., Yamamoto, K., Yano, M., Sasaki, T., Kanegae, T., Wada, M., Takano, M. Plant Cell Physiol. (2000) [Pubmed]
  27. The auxin-induced maize gene ZmSAUR2 encodes a short-lived nuclear protein expressed in elongating tissues. Knauss, S., Rohrmeier, T., Lehle, L. J. Biol. Chem. (2003) [Pubmed]
  28. Barley coleoptile peroxidases. Purification, molecular cloning, and induction by pathogens. Kristensen, B.K., Bloch, H., Rasmussen, S.K. Plant Physiol. (1999) [Pubmed]
  29. Auxin-binding protein from coleoptile membranes of corn (Zea mays L.). II. Localization of a putative auxin receptor. Löbler, M., Klämbt, D. J. Biol. Chem. (1985) [Pubmed]
  30. The isolation and identification of several trichothecene mycotoxins from Fusarium heterosporum. Cole, R.J., Dorner, J.W., Cox, R.H., Cunfer, B.M., Cutler, H.G., Stuart, B.P. J. Nat. Prod. (1981) [Pubmed]
  31. Inhibition of gravitropism in oat coleoptiles by the calcium chelator, ethyleneglycol-bis-(beta-aminoethyl ether)-N,N'-tetraacetic acid. Daye, S., Biro, R.L., Roux, S.J. Physiol. Plantarum (1984) [Pubmed]
  32. Comparative expression of five Lea Genes during wheat seed development and in response to abiotic stresses by real-time quantitative RT-PCR. Ali-Benali, M.A., Alary, R., Joudrier, P., Gautier, M.F. Biochim. Biophys. Acta (2005) [Pubmed]
  33. Proteomic characterization of herbicide safener-induced proteins in the coleoptile of Triticum tauschii seedlings. Zhang, Q., Riechers, D.E. Proteomics (2004) [Pubmed]
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