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Sexual and apomictic reproduction in Hieracium subgenus Pilosella are closely interrelated developmental pathways


Tucker, MR and Araujo, ACG and Paech, nA and Hecht, VFG and Schmidt, EDL and Rossell, JB and de Vries, SC and Koltunow, AMG, Sexual and apomictic reproduction in Hieracium subgenus Pilosella are closely interrelated developmental pathways, The Plant Cell, 15, (7) pp. 1524-1537. ISSN 1040-4651 (2003) [Refereed Article]

DOI: doi:10.1105/tpc.011742


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 sac, and double fertilization to initiate embryo and endosperm formation. During apomixis, or asexual seed formation, in Hieracium ovules, a somatic aposporous initial (Al) 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.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Environmentally sustainable plant production
Objective Field:Environmentally sustainable plant production not elsewhere classified
UTAS Author:Hecht, VFG (Dr Valerie Hecht)
ID Code:48181
Year Published:2003
Web of Science® Times Cited:114
Deposited By:Plant Science
Deposited On:2007-10-01
Last Modified:2010-06-05

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