Sexual and apomictic reproduction in Hieracium subgenus pilosella are closely interrelated developmental pathways
| Autor: | Anna M. G. Koltunow, Matthew R. Tucker, Sacco C. de Vries, Ana-Claudia G. Araujo, Eduard Daniel Leendert Schmidt, Jan-Bart Rossell, Valérie Hecht, Nicholas A. Paech |
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| Rok vydání: | 2003 |
| Předmět: |
endosperm development
Plant Science Asteraceae Biochemistry Endosperm Gene Expression Regulation Plant Ovule In Situ Hybridization Glucuronidase Plant Proteins Genetics EPS-1 biology Reproduction food and beverages Gene Expression Regulation Developmental Nuclear Proteins Plants Genetically Modified Meiosis embryonic structures Seeds apomixis seed development Research Article Recombinant Fusion Proteins Molecular Sequence Data Biochemie embryo arabidopsis-thaliana Flowers Double fertilization Apomixis expression Amino Acid Sequence gene Hieracium Sequence Homology Amino Acid Arabidopsis Proteins Cell Biology biology.organism_classification pattern-formation Sexual reproduction Repressor Proteins ovule development fertilization Megaspore mother cell Protein Kinases Transcription Factors |
| Zdroj: | The Plant Cell 15 (2003) The Plant Cell, 15, 1524-1537 |
| ISSN: | 1040-4651 |
| Popis: | Seed formation in flowering plants requires meiosis of the megaspore mother cell (MMC) inside the ovule, selection of a megaspore that undergoes mitosis to form an embryo sad, and double fertilization to initiate embryo and endosperm formation. During apomixis, or asexual seed formation, in Hieracium ovules, a somatic aposporous initial (All) cell divides to form a structurally variable aposporous embryo sac and embryo. This entire process, including endosperm development, is fertilization independent. Introduction of reproductive tissue marker genes into sexual and apomictic Hieracium showed that Al cells do not express a MMC marker. Spatial and temporal gene expression patterns of other introduced genes were conserved commencing with the first nuclear division of the Al cell in apomicts and the mitotic initiation of embryo sac formation in sexual plants. Conservation in expression patterns also occurred during embryo and endosperm development, indicating that sexuality and apomixis are interrelated pathways that share regulatory components. The induction of a modified sexual reproduction program in Al cells may enable the manifestation of apomixis in Hieracium. |
| Databáze: | OpenAIRE |
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