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Ovular Development and Morphology of the Outer Integument of Magnolia grandiflora (Magnoliaceae)

1994; Wiley; Volume: 81; Issue: 3 Linguagem: Inglês

10.2307/2445464

1537-2197

Azusa Umeda, Ryoko Imaichi, Masahiro Kato,

Fern and Epiphyte Biology

American Journal of BotanyVolume 81, Issue 3 p. 361-367 Structure and Development Ovular development and morphology of the outer integument of Magnolia grandiflora (Magnoliaceae) Azusa Umeda, Azusa Umeda Faculty of Agriculture, Tamagawa University, 6–1-1 Tamagawagakuen, Machida, Tokyo, 194 JapanSearch for more papers by this authorRyoko Imaichi, Ryoko Imaichi Faculty of Agriculture, Tamagawa University, 6–1-1 Tamagawagakuen, Machida, Tokyo, 194 JapanSearch for more papers by this authorMasahiro Kato, Masahiro Kato Botanical Gardens, Faculty of Science, University of Tokyo, 3–7-1, Hakusan, Tokyo, 112 JapanSearch for more papers by this author Azusa Umeda, Azusa Umeda Faculty of Agriculture, Tamagawa University, 6–1-1 Tamagawagakuen, Machida, Tokyo, 194 JapanSearch for more papers by this authorRyoko Imaichi, Ryoko Imaichi Faculty of Agriculture, Tamagawa University, 6–1-1 Tamagawagakuen, Machida, Tokyo, 194 JapanSearch for more papers by this authorMasahiro Kato, Masahiro Kato Botanical Gardens, Faculty of Science, University of Tokyo, 3–7-1, Hakusan, Tokyo, 112 JapanSearch for more papers by this author First published: 01 March 1994 https://doi.org/10.1002/j.1537-2197.1994.tb15455.xCitations: 20 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 Ovular development of Magnolia grandiflora was examined to determine the morphology of the outer integument. At the time the ovular primordium begins incurving, the outer integument is initiated subdermally, and later the inner integument arises from the dermal layer. Whereas the inner integument is annular, the outer integument is formed as a semiannular rim interrupted on the concave side of the funiculus. Later the outer integument becomes a hood-shaped envelope. The obturator is formed as a transversely elongate outgrowth on the concave side of the funiculus and intervenes in the gap of the outer integument. During further development the inner integument produces several distal lobes, and the outer integument becomes bilobed. The exostome is a transverse slit with a middle notch, formed by the outer integument and the obturator. Presumed wide occurrence of the hood-shaped outer integument in primitive families suggests that it is a primitive state. The outer integument is compared with the ovuliferous sporophylls of the glossopterid and caytonialean seed ferns. Citing Literature Volume81, Issue3March 1994Pages 361-367 RelatedInformation