Ultrastructural Study on Microspore Wall Morphogenesis in Isoetes Japonica (Isoetaceae)
1991; Wiley; Volume: 78; Issue: 9 Linguagem: Inglês
10.2307/2444922
ISSN1537-2197
AutoresKoichi Uehara, Siro Kurita, Norio Sahashi, Taichi Ohmoto,
Tópico(s)Plant Disease Management Techniques
ResumoAmerican Journal of BotanyVolume 78, Issue 9 p. 1182-1190 Article ULTRASTRUCTURAL STUDY ON MICROSPORE WALL MORPHOGENESIS IN ISOETES JAPONICA (ISOETACEAE) Koichi Uehara, Koichi Uehara Department of Biology, College of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 153Search for more papers by this authorSiro Kurita, Siro Kurita Department of Biology, Faculty of Science, Chiba University, Yayoi-cho, Chiba 260Search for more papers by this authorNorio Sahashi, Norio Sahashi School of Pharmaceutical Science, Toho University, Funabashi, Chiba 274, JapanSearch for more papers by this authorTaichi Ohmoto, Taichi Ohmoto School of Pharmaceutical Science, Toho University, Funabashi, Chiba 274, JapanSearch for more papers by this author Koichi Uehara, Koichi Uehara Department of Biology, College of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 153Search for more papers by this authorSiro Kurita, Siro Kurita Department of Biology, Faculty of Science, Chiba University, Yayoi-cho, Chiba 260Search for more papers by this authorNorio Sahashi, Norio Sahashi School of Pharmaceutical Science, Toho University, Funabashi, Chiba 274, JapanSearch for more papers by this authorTaichi Ohmoto, Taichi Ohmoto School of Pharmaceutical Science, Toho University, Funabashi, Chiba 274, JapanSearch for more papers by this author First published: 01 September 1991 https://doi.org/10.1002/j.1537-2197.1991.tb11411.xCitations: 11 Author for correspondence, current address: Biological Laboratory, College of Arts and Sciences, Chiba University. Yayoi-cho, Chiba 260, Japan. 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 Spore wall morphogenesis of the microspore of Isoetes japonica was studied by transmission electron microscopy. The microspore wall consists of four layers: the perispore, outer exospore, inner exospore, and endospore. The perispore consists of electron-dense materials. The exospore is divided into outer and inner sections, with a large gap between the two. The outer exospore appears as an undulating plate consisting of tripartite lamellae with homogeneous sporopollenin. The inner exospore consists of an accumulation of tripartite lamellae on the microspore cell membrane. Immediately after meiosis, the tripartite lamellae of the outer exospore forms around the microspore. The lamellated inner exospore forms next, which adheres to the cell membrane of the microspore. The deposition of homogeneous sporopollenin material on the tripartite lamellae causes the plates of the outer exospore to thicken. Some homogeneous material may also be deposited on the inner exospore. Lastly, the electron-dense perispore is deposited on the outer exospore, and the electron-lucent endospore forms beneath the inner exospore. We conclude that the lamellae of the outer exospore, inner exospore, and endospore are formed and derived, in that order, from the gametophytic microspore cytoplasm. The homogeneous sporopollenin material of the outer exospore and perispore may be derived from the sporophytic tapetal cytoplasm. Citing Literature Volume78, Issue9September 1991Pages 1182-1190 RelatedInformation
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