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Development of the Phytomelanin Layer in Fruits of Ageratum conyzoides (Compositae)

1989; Wiley; Volume: 76; Issue: 5 Linguagem: Inglês

10.2307/2444420

1537-2197

Arun K. Pandey, Lee W. Wilcox, Fred D. Sack, Tod F. Stuessy,

Sesquiterpenes and Asteraceae Studies

American Journal of BotanyVolume 76, Issue 5 p. 739-746 Article DEVELOPMENT OF THE PHYTOMELANIN LAYER IN FRUITS OF AGERATUM CONYZOIDES (COMPOSITAE) Arun K. Pandey, Arun K. Pandey Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Permanent address: Department of Botany, Bhagalpur University, Bhagalpur 812007, India.Search for more papers by this authorLee W. Wilcox, Lee W. Wilcox Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Search for more papers by this authorFred D. Sack, Fred D. Sack Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Search for more papers by this authorTod F. Stuessy, Tod F. Stuessy Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Search for more papers by this author Arun K. Pandey, Arun K. Pandey Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Permanent address: Department of Botany, Bhagalpur University, Bhagalpur 812007, India.Search for more papers by this authorLee W. Wilcox, Lee W. Wilcox Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Search for more papers by this authorFred D. Sack, Fred D. Sack Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Search for more papers by this authorTod F. Stuessy, Tod F. Stuessy Department of Botany, Ohio State University, Columbus Ohio, 43210-1293Search for more papers by this author First published: 01 May 1989 https://doi.org/10.1002/j.1537-2197.1989.tb11368.xCitations: 10 Reprint requests. 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 The development of the phytomelanin layer in the achenes of Ageratum conyzoides (Compositae, Eupatorieae) was studied using light and electron microscopy. At the level of the embryo sac, the young ovary wall contains an outer zone, consisting of an epidermis and two hypodermal layers, and an inner zone, consisting of developing fiber cells and 3–5 layers of parenchyma. A schizogenous space forms between the developing fibers and the inner hypodermis at about the time that the embryo sac is fully organized. At this stage, the developing fibers contain papilla which are outgrowths that connect the fibers to the inner hypodermal cells. After fertilization, phytomelanin accumulates on the cell walls lining this space. Subsequently, by the time the fruit matures, the phytomelanin fills the space completely and forms a solid, black layer. The surface of the inner hypodermis that faces the space forms a mold; the characteristic peglike projections of the mature phytomelanin layer develop by filling the invaginations between the hypodermal cells. During phytomelanin accumulation, abundant smooth endoplasmic reticulum is present in the hypodermis, especially in the outer layer. It is hypothesized that the precursors of the phytomelanin are synthesized in this endoplasmic reticulum and that these precursors migrate into the space where the phytomelanin is polymerized. Citing Literature Volume76, Issue5May 1989Pages 739-746 RelatedInformation