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Publikation

Nishiyama, T.; Sakayama, H.; de Vries, J.; Buschmann, H.; Saint-Marcoux, D.; Ullrich, K. K.; Haas, F. B.; Vanderstraeten, L.; Becker, D.; Lang, D.; Vosolsobě, S.; Rombauts, S.; Wilhelmsson, P. K.; Janitza, P.; Kern, R.; Heyl, A.; Rümpler, F.; Calderón Villalobos, L. I. A.; Clay, J. M.; Skokan, R.; Toyoda, A.; Suzuki, Y.; Kagoshima, H.; Schijlen, E.; Tajeshwar, N.; Catarino, B.; Hetherington, A. J.; Saltykova, A.; Bonnot, C.; Breuninger, H.; Symeonidi, A.; Radhakrishnan, G. V.; Van Nieuwerburgh, F.; Deforce, D.; Chang, C.; Karol, K. G.; Hedrich, R.; Ulvskov, P.; Glöckner, G.; Delwiche, C. F.; Petrášek, J.; Van de Peer, Y.; Friml, J.; Beilby, M.; Dolan, L.; Kohara, Y.; Sugano, S.; Fujiyama, A.; Delaux, P.-M.; Quint, M.; Theißen, G.; Hagemann, M.; Harholt, J.; Dunand, C.; Zachgo, S.; Langdale, J.; Maumus, F.; Van Der Straeten, D.; Gould, S. B.; Rensing, S. A.; The Chara Genome: Secondary Complexity and Implications for Plant Terrestrialization Cell 174, 448-464.e24, (2018) DOI: 10.1016/j.cell.2018.06.033

Land plants evolved from charophytic algae, among which Charophyceae possess the most complex body plans. We present the genome of Chara braunii; comparison of the genome to those of land plants identified evolutionary novelties for plant terrestrialization and land plant heritage genes. C. braunii employs unique xylan synthases for cell wall biosynthesis, a phragmoplast (cell separation) mechanism similar to that of land plants, and many phytohormones. C. braunii plastids are controlled via land-plant-like retrograde signaling, and transcriptional regulation is more elaborate than in other algae. The morphological complexity of this organism may result from expanded gene families, with three cases of particular note: genes effecting tolerance to reactive oxygen species (ROS), LysM receptor-like kinases, and transcription factors (TFs). Transcriptomic analysis of sexual reproductive structures reveals intricate control by TFs, activity of the ROS gene network, and the ancestral use of plant-like storage and stress protection proteins in the zygote.

Publikation

Lannoo, N.; Vandenborre, G.; Miersch, O.; Smagghe, G.; Wasternack, C.; Peumans, W. J.; Van Damme, E. J. M.; The Jasmonate-Induced Expression of the Nicotiana tabacum Leaf Lectin Plant Cell Physiol. 48, 1207-1218, (2007) DOI: 10.1093/pcp/pcm090

Previous experiments with tobacco (Nicotiana tabacum L. cv Samsun NN) plants revealed that jasmonic acid methyl ester (JAME) induces the expression of a cytoplasmic/nuclear lectin in leaf cells and provided the first evidence that jasmonates affect the expression of carbohydrate-binding proteins in plant cells. To corroborate the induced accumulation of relatively large amounts of a cytoplasmic/nuclear lectin, a detailed study was performed on the induction of the lectin in both intact tobacco plants and excised leaves. Experiments with different stress factors demonstrated that the lectin is exclusively induced by exogeneously applied jasmonic acid and JAME, and to a lesser extent by insect herbivory. The lectin concentration depends on leaf age and the position of the tissue in the leaf. JAME acts systemically in intact plants but very locally in excised leaves. Kinetic analyses indicated that the lectin is synthesized within 12 h exposure time to JAME, reaching a maximum after 60 h. After removal of JAME, the lectin progressively disappears from the leaf tissue. The JAME-induced accumulation of an abundant nuclear/cytoplasmic lectin is discussed in view of the possible role of this lectin in the plant.