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650 results on '"Köhler, Claudia"'

6. Genetic basis and timing of a major mating system shift in Capsella

Author

Bachmann, Jörg A., Tedder, Andrew, Laenen, Benjamin, Fracassetti, Marco, Désamoré, Aurélie, Lafon-Placette, Clément, Steige, Kim A., Callot, Caroline, Marande, William, Neuffer, Barbara, Bergès, Hélène, Köhler, Claudia, Castric, Vincent, and Slotte, Tanja

Published
2019

7. Flowering plant reproduction.

Author

Butel, Nicolas and Köhler, Claudia

Subjects
*PLANT reproduction, *FLOWERING of plants, *ANGIOSPERMS, *PLANT species, *ENDOSPERM, *SEEDS
Abstract

Flowering plants, also known as angiosperms, emerged approximately 150 to 200 million years ago. Since then, they have undergone rapid and extensive expansion, now encompassing around 90% of all land plant species. The remarkable diversification of this group has been a subject of in-depth investigations, and several evolutionary innovations have been proposed to account for their success. In this primer, we will specifically focus on one such innovation: the advent of seeds containing endosperm. Butel and Köhler give an overview of the process of reproduction in flowering plants. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Thick subcategories of finite algebraic triangulated categories

Author

Köhler, Claudia

Subjects
Mathematics - Category Theory, Mathematics - Representation Theory, Primary: 18E30, Secondary: 05E10, 16G20
Abstract

We classify the thick subcategories of an algebraic triangulated standard category with finitely many indecomposable objects., Comment: 24 pages

Published
2010

22. The Challenge of a 4°C World by 2100

Author

Schellnhuber, Hans Joachim, Serdeczny, Olivia Maria, Adams, Sophie, Köhler, Claudia, Magdalena Otto, Ilona, Schleussner, Carl-Friedrich, Brauch, Hans Günter, Series editor, Oswald Spring, Úrsula, editor, Grin, John, editor, and Scheffran, Jürgen, editor

Published
2016
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33. Meiocyte size is a determining factor for unreduced gamete formation in Arabidopsis thaliana

Author

Yi, Jun, Kradolfer, David, Brownfield, Lynette, Ma, Yingrui, Piskorz, Ewa, Köhler, Claudia, Kohler, Claudia, and Jiang, Hua

Subjects
Botany, Plant Biotechnology
Abstract

Polyploidy, the presence of more than two sets of chromosomes within a cell, is a widespread phenomenon in plants. The main route to polyploidy is considered through the production of unreduced gametes that are formed as a consequence of meiotic defects. Nevertheless, for reasons poorly understood, the frequency of unreduced gamete formation differs substantially among different plant species. The previously identified meiotic mutant jason (jas) in Arabidopsis thaliana forms about 60% diploid (2n) pollen. JAS is required to maintain an organelle band as a physical barrier between the two meiotic spindles, preventing previously separated chromosome groups from uniting into a single cell.In this study, we characterized the jas suppressor mutant telamon (tel) that restored the production of haploid pollen in the jas background.The tel mutant did not restore the organelle band, but enlarged the size of male jas tel meiocytes, suggesting that enlarged meiocytes can bypass the requirement of the organelle band. Consistently, enlarged meiocytes generated by a tetraploid jas mutant formed reduced gametes.The results reveal that meiocyte size impacts chromosome segregation in meiosis II, suggesting an alternative way to maintain the ploidy stability in meiosis during evolution.

Published
2023

34. Endosperm cellularization failure induces a dehydration stress response leading to embryo arrest

Author

Xu, Wenjia, Sato, Hikaru, Bente, Heinrich, Santos-González, Juan, and Köhler, Claudia

Subjects
Botany, Cell Biology
Abstract

The endosperm is a nutritive tissue supporting embryo growth in flowering plants. Most commonly, the endosperm initially develops as a coenocyte (multinucleate cell) and then cellularizes. This process of cellularization is frequently disrupted in hybrid seeds generated by crosses between different flowering plant species or plants that differ in ploidy, resulting in embryo arrest and seed lethality. The reason for embryo arrest upon cellularization failure remains unclear. In this study, we show that triploid Arabidopsis thaliana embryos surrounded by uncellularized endosperm mount an osmotic stress response that is connected to increased levels of abscisic acid (ABA) and enhanced ABA responses. Impairing ABA biosynthesis and signaling aggravated triploid seed abortion, while increasing endogenous ABA levels as well as the exogenous application of ABA-induced endosperm cellularization and suppressed embryo growth arrest. Taking these results together, we propose that endosperm cellularization is required to establish dehydration tolerance in the developing embryo, ensuring its survival during seed maturation.

Published
2023

50. Sonografische Ileusdiagnostik

Author

Langguth, Johanna, additional, Köhler, Claudia, additional, Siegel, Tanja, additional, Alef, Michaele, additional, and Kiefer, Ingmar, additional

Published
2022
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