PROTEIN PHOSPHATASE 2A-B'γ controls Botrytis cinerea resistance and developmental leaf senescence

Plants optimize their growth and survival through highly integrated regulatory networks that coordinate defensive measures and developmental transitions in response to environmental cues. Protein phosphatase 2A (PP2A) is a key signaling component that controls stress reactions and growth at different stages of plant development, and the PP2A regulatory subunit PP2A-B'γ is required for negative regulation of pathogenesis responses and for maintenance of cell homeostasis in short day conditions. Here, we report molecular mechanisms by which PP2A-B'γ regulates Botrytis cinerea resistance and leaf senescence in Arabidopsis (Arabidopsis thaliana). We extend the molecular functionality of PP2A-B'γ to a protein kinase-phosphatase interaction with the defense-associated calcium-dependent protein kinase CPK1 and present indications this interaction may function to control CPK1 activity. In pre-senescent leaf tissues, PP2A-B'γ is also required to negatively control the expression of salicylic acid-related defense genes, which have recently proven vital in plant resistance to necrotrophic fungal pathogens. In addition, we find the premature leaf yellowing of pp2a-b'γ depends on salicylic acid biosynthesis via SALICYLIC ACID INDUCTION DEFICIENT2 and bears the hallmarks of developmental leaf senescence. We propose PP2A-B'γ age-dependently controls salicylic acid-related signaling in plant immunity and developmental leaf senescence.</p

Die Bücher der Astronomen : ["Bernhard von Lindenau als Gelehrter, Staatsmann, Menschenfreund und Förderer der schönen Künste" Ausstellung im Lindenau-Museum Altenburg vom 12. Juni bis 12. September 2004] / Peter Brosche

DIE BÜCHER DER ASTRONOMEN : ["BERNHARD VON LINDENAU ALS GELEHRTER, STAATSMANN, MENSCHENFREUND UND FÖRDERER DER SCHÖNEN KÜNSTE" AUSSTELLUNG IM LINDENAU-MUSEUM ALTENBURG VOM 12. JUNI BIS 12. SEPTEMBER 2004] / PETER BROSCHE Die Bücher der Astronomen : ["Bernhard von Lindenau als Gelehrter, Staatsmann, Menschenfreund und Förderer der schönen Künste" Ausstellung im Lindenau-Museum Altenburg vom 12. Juni bis 12. September 2004] / Peter Brosche (1) Einband (1) Abb.: Widmung an Lindenau ... (4) Titelseite (5) Titelseite (6) 1 Einleitung (7) 2 Die Wege der Bücher (8) 3 Zuordnungen und Quantitäten (11) 4 Erhalten oder fehlend (13) 5 Nahm Lindenau Abschied von der Astronomie? (16) Abkürzungen für Literaturangaben (21) Anhang (22) Anmerkungen (24) Danksagung (26) Angaben zu Titel und Lindenau-Museum (27

2nd Workshop on Tidal Friction and the Earth's Rotation

In the four years which elapsed between our first workshop on .Tidal Friction and the Earth's Rotation and the second, the proceedings of which are presented here, many of the disciplines involved made ad­ vances which we felt should be exchanged. We were encouraged by the good reception our first report met with. Of course, more insight often means more problems. Therefore, this volume contains new results and revisions of matters which previously appeared settled. We are certainly far from "final answers". For this reason, differing opinions on some issues are to be found in this book. Moreover, we have refrained from making mathematical symbols uniform to avoid the risk of errors and non-compatibility with the earlier work of an author. The two workshops have stimulated collaboration between participants working in various fields. The final versions of the contributions have already profited from these discussions. We are convinced that they will also influence further investigations. This advancement of our past and future aims is based on the very existence of the Centre for Interdisciplinary Studies and on the support we have received from its leading members. The authors have agreed to dedicate this book to Dr. H. Gerstenkorn, who died in 1981. He contributed fundamental ideas to the scientific fields treated in the meeting. P. Brosche Daun, September 1982 J. Slindermann Contents * Julius Robert Mayer's Ideas on a Theory of Tidal Friction H.P. Miinzenmayer ...•••.•••..••.•..•...••..•...•.•••.••••....•