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

journal contribution
posted on 2023-05-16, 20:11 authored by Tucker, MR, Araujo, ACG, Paech, nA, Valerie HechtValerie Hecht, Schmidt, EDL, Rossell, JB, de Vries, SC, Koltunow, AMG
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.

History

Publication title

The Plant Cell

Volume

15

Issue

7

Pagination

1524-1537

ISSN

1040-4651

Department/School

School of Natural Sciences

Publisher

American Society of Plant Biologists

Place of publication

United States

Repository Status

  • Restricted

Socio-economic Objectives

Environmentally sustainable plant production not elsewhere classified

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