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Mosaicism in the organization of Con A binding sites on the membrane surface of female cells of Nicotiana tabacum.

Authors
  • Ke-Feng, Fang
  • Ting-Ting, Yan
  • Meng-Xiang, Sun
Type
Published Article
Journal
The New phytologist
Publication Date
Sep 01, 2005
Volume
167
Issue
3
Pages
743–750
Identifiers
PMID: 16101911
Source
Medline
License
Unknown

Abstract

The presence of mosaicism in the organization of concanavalin agglutinin (Con A) binding sites on murine egg cells was first reported 30 year ago. This discovery has triggered extensive studies into the roles of glycoproteins in gamete interactions in animals. This report comprises the first account of the existence of the mosaicism in higher plants. The distribution of Con A binding sites on both egg cells and central cells of tobacco (Nicotiana tabacum) was found to be polar and apparently determined by the location of the nucleus of the cell. On central cells, Con A binding sites were distributed on the section of the plasma membrane surface near the nucleus. By contrast, the binding sites on egg cells were concentrated away from the nucleus. Therefore, polarity of the plasma membrane component of female cells was confirmed for the first time. It is proposed that such polarized ConA binding sites could be involved in sperm recognition.

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