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Embryo Sac Lacking Antipodal Cells in Arabidopsis thaliana (Brassicaceae)

1993; Wiley; Volume: 80; Issue: 7 Linguagem: Inglês

10.2307/2445602

1537-2197

M. Murgia, Bingquan Huang, Shirley C. Tucker, Mary E. Musgrave,

Plant Ecology and Taxonomy Studies

American Journal of BotanyVolume 80, Issue 7 p. 824-838 Structure and Development EMBRYO SAC LACKING ANTIPODAL CELLS IN ARABIDOPSIS THALIANA (BRASSICACEAE) Meri Murgia, Meri Murgia Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, 70803Search for more papers by this authorBing-Quan Huang, Bing-Quan Huang Department of Botany and Microbiology, and Samuel Roberts Noble Electron Microscopy Laboratory, University of Oklahoma, Norman, Oklahoma, 73019-0245Search for more papers by this authorShirley C. Tucker, Shirley C. Tucker Department of Botany, Louisiana State University, Baton Rouge, Louisiana, 70803Search for more papers by this authorMary E. Musgrave, Mary E. Musgrave Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, 70803Search for more papers by this author Meri Murgia, Meri Murgia Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, 70803Search for more papers by this authorBing-Quan Huang, Bing-Quan Huang Department of Botany and Microbiology, and Samuel Roberts Noble Electron Microscopy Laboratory, University of Oklahoma, Norman, Oklahoma, 73019-0245Search for more papers by this authorShirley C. Tucker, Shirley C. Tucker Department of Botany, Louisiana State University, Baton Rouge, Louisiana, 70803Search for more papers by this authorMary E. Musgrave, Mary E. Musgrave Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, 70803Search for more papers by this author First published: 01 July 1993 https://doi.org/10.1002/j.1537-2197.1993.tb15298.xCitations: 21 5 Author for correspondence. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Ultrastructure of the embryo sac lacking antipodals in prefertilization stages in Arabidopsis thaliana has been examined 2 hr before and 5 hr after manual cross pollination. The cytoplasm of both synergids before fertilization is rich in ribosomes, mitochondria, and rough endoplasmic reticulum, and also contains several microbodies and spherosomes. The filiform apparatus includes electron-dense material and a fibrous part. Many cortical microtubules appear in the filiform apparatus area. One of the two synergids degenerates before fertilization. The synergids, the egg cell, and central cell have a rich cytoskeleton of microtubules; only the synergids appear to contain microfilaments. At the chalazal end, the antipodals are initially present but degenerate by the time of pollination in most embryo sacs in the starchless line studied. The embryo sac is completely surrounded by a wall containing an electron-dense layer, separating it from the nucellus, including the chalazal end. When the antipodals have degenerated, the electron-dense layer disappears at the chalazal end only, and the wall between the central cell and the nucellus is homogeneous. Between the central cell and nucellar cells no plasmodesmata are found. The membranes of both antipodal cells at the chalazal end of the embryo sac appear sinuous, like those of transfer cells. The central cell has plastids preferentially distributed around the nucleus, but the other organelles are randomly distributed. The central cell in the embryo sac and the adjacent chalazal nucellar cells show a transfer-cell function in the embryo sac after the antipodals degenerate. Citing Literature Volume80, Issue7July 1993Pages 824-838 RelatedInformation