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Comparative Ultrastructural Studies of Spermatogenesis in the Metzgeriales (Hepatophyta). II. The Blepharoplast of Blasia pusilla

1987; Wiley; Volume: 74; Issue: 1 Linguagem: Inglês

10.2307/2444331

1537-2197

Karen S. Renzaglia, Jeffrey G. Duckett,

Fern and Epiphyte Biology

American Journal of BotanyVolume 74, Issue 1 p. 53-64 Article COMPARATIVE ULTRASTRUCTURAL STUDIES OF SPERMATOGENESIS IN THE METZGERIALES (HEPATOPHYTA) II. THE BLEPHAROPLAST OF BLASIA PUSILLA Karen S. Renzaglia, Karen S. Renzaglia School of Biological Sciences, Queen Mary College, Mile End Road, London, El 4NS England, U.K.Present address: Dept. of Biological Sciences, East Tennessee State Univ., Johnson City, TN 37614.Search for more papers by this authorJeffrey G. Duckett, Jeffrey G. Duckett School of Biological Sciences, Queen Mary College, Mile End Road, London, El 4NS England, U.K.Search for more papers by this author Karen S. Renzaglia, Karen S. Renzaglia School of Biological Sciences, Queen Mary College, Mile End Road, London, El 4NS England, U.K.Present address: Dept. of Biological Sciences, East Tennessee State Univ., Johnson City, TN 37614.Search for more papers by this authorJeffrey G. Duckett, Jeffrey G. Duckett School of Biological Sciences, Queen Mary College, Mile End Road, London, El 4NS England, U.K.Search for more papers by this author First published: 01 January 1987 https://doi.org/10.1002/j.1537-2197.1987.tb08579.xCitations: 9 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 As in other hepatics, the young spermatid of Blasia pusilla contains a well-developed blepharoplast comprising a four-layered multilayered structure (MLS) and two overlying dimorphic basal bodies. The asymmetrical spline (S1 or upper stratum of the MLS) numbers 20 or 21 microtubules (MTs) at its anterior tip and reduces to eight at the posterior limit of the lamellar strip (LS). Behind this the shank of the spline is five or six tubules in width over most of its length, approximately one revolution of the circumference of the gamete. The three-microtubule spline aperture underlies the anterior basal body and like those of most hepatics, it is closed at its anterior end. The asymmetrical LS (approx. 2.0 μm in length) is characterized by a right-hand posterior notch which lies below the spline aperture at the region of the cartwheel configuration of the anterior basal body (ABB). The staggered dimorphic basal bodies overlap for approximately one third of their lengths. Both lie parallel to the long axis of the spline. As in other hepatics, the ABB (1.2 μm in length) is subapical and comprises an anterior hub extension with progressive rearward additions of lateral, dorsal and ventral triplets. Over most of its length (2.1 μm) the longer posterior basal body (PBB) consists of a distinct central hub and three ventral triplets. Transition zones of both basal bodies contain stellate configurations into which the two central axonemal MTs frequently extend. The blepharoplast of Blasia shows several features in common with leafy, simple thalloid and complex thalloid liverworts. Compared with the few Metzgeriales observed thus far, the LS is less elongate and the basal bodies less staggered. Dimensions of basal body components and spline dimensions, however, are comparable to those of most leafy and thalloid hepatics. Striking similarities with the complex thalloid liverworts include a posterior notch in the LS and a spline aperture three MTs wide. Citing Literature Volume74, Issue1January 1987Pages 53-64 RelatedInformation