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The Megagametophyte in Anarthria (Anarthriaceae, Poales) and Its Implications for the Phylogeny of the Poales

1993; Wiley; Volume: 80; Issue: 12 Linguagem: Inglês

10.2307/2445675

1537-2197

H. Peter Linder, Paula J. Rudall,

Fern and Epiphyte Biology

American Journal of BotanyVolume 80, Issue 12 p. 1455-1464 Systematics and Evolution The megagametophyte in Anarthria (Anarthriaceae, Poales) and its implications for the phylogeny of the Poales H. P. Linder, H. P. Linder Bolus Herbarium, Department of Botany, University of Cape Town, Rondebosch, 7700 South Africa The Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB EnglandSearch for more papers by this authorP. J. Rudall, P. J. Rudall Bolus Herbarium, Department of Botany, University of Cape Town, Rondebosch, 7700 South Africa The Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB EnglandSearch for more papers by this author H. P. Linder, H. P. Linder Bolus Herbarium, Department of Botany, University of Cape Town, Rondebosch, 7700 South Africa The Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB EnglandSearch for more papers by this authorP. J. Rudall, P. J. Rudall Bolus Herbarium, Department of Botany, University of Cape Town, Rondebosch, 7700 South Africa The Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB EnglandSearch for more papers by this author First published: 01 December 1993 https://doi.org/10.1002/j.1537-2197.1993.tb15391.xCitations: 23 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 The development and structure of the megagametophyte of Anarthria (Anarthriaceae), Aphclia, and Centrolepis (Centrolepidaceae) are described. Anarthriaceae has tenuinucellate ovules and the Polygonum type of megagametophyte development, both characters typical of the Poales. However, it lacks the anticlinally elongated nucellar epidermis and numerous large starch bodies observed in the megagametophyte of Centrolepidaceae, both characters also present in Restionaceae. This relatively generalized megagametophyte structure is consistent with data from the chloroplast genome, which suggest that Anarthriaceae are not as closely related to Restionaceae as previously assumed. New data from the megagametophyte are analyzed cladistically together with other available information on the poalean families. The results show that there are two possible positions for Anarthriaceae: either as sister to Poaceae. Joinvilleaceae, Restionaceae, Ecdeiocoleaceae, and Restionaceae, or as sister to only the latter three families. The new data also allow a critical reevaluation of the phylogenetic position of Centrolepidaceae, which is either basal to the poalean clade (based on microgametophyte data), or embedded in the Restionaceae (based on anther structure and megagametophyte data). Citing Literature Volume80, Issue12December 1993Pages 1455-1464 RelatedInformation