Ovule and Seed Development in Certain Cacti
1960; Wiley; Volume: 47; Issue: 6 Linguagem: Inglês
10.2307/2439559
ISSN1537-2197
Autores Tópico(s)Botanical Research and Applications
ResumoAmerican Journal of BotanyVolume 47, Issue 6 p. 460-467 Article OVULE AND SEED DEVELOPMENT IN CERTAIN CACTI E. Mark Engleman, E. Mark EnglemanSearch for more papers by this author E. Mark Engleman, E. Mark EnglemanSearch for more papers by this author First published: 01 June 1960 https://doi.org/10.1002/j.1537-2197.1960.tb10612.xCitations: 10AboutPDF 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 Engleman, E. Mark. (U. of California, Davis.) Ovule and seed development in certain cacti. Amer. Jour. Bot. 47(6) : 460–467. Illus. 1960.—Ovules of Astrophytum myriostigma, Thelocactus bicolor, and Toumeya papyracantha are crassinucellate, possess a nucellar cap, and have a micropyle formed only by the inner of 2 integuments. Survival of the chalazal megaspore results in a monosporic gametophyte. A single layer of endosperm cells forms a cap over the radicle in a mature seed, as occurs in some of the Centrospermae. The characteristic hilum cup consists of the hilum and variable amounts of thickened cells of the funiculus which border a cuplike cavity. The hilum cup is associated with a funicular hump near the junction of the funiculus and the integuments. The funicular hump is similar in position to a swelling on the funiculus of some members of the Centrospermae. Citing Literature Volume47, Issue6June 1960Pages 460-467 RelatedInformation
Referência(s)