Bryological and Lichenological Section/ABLS
d'Artenay, Tamrya D. , Renzaglia, Karen S. .
Locomotory apparatus comparisons between gametes in the Aneuraceae.
Swimming sperm cells of Aneura pinguis are decidedly longer and wider than those of Riccardia multifida. This study tested the hypothesis that the difference in mature cell size of these two members of the Aneuraceae will be reflected in the architecture of the locomotory apparatus in the mid-staged spermatid. A previous report details the microanatomy of the locomotory apparatus of R. multifida (Rushing et al. 1995). A. pinguis has a substantially wider multilayered structure than does R. multifida. The spline of the former reaches a maximum of 20 microtubules (MTs) in width and the lamellar strip (LS) is 0.60 µm in width, while the spline is 16 MTs and the LS 0.42 µm in the latter species. Although the lamellar strip is slightly longer in A. pinguis, the basal body (BB) stagger is moderately greater in R. multifida. The transition region in BBs of both liverworts is short (~0.05 µm) and consists of a stellate pattern with a unique, dark, central-matrix. The anterior basal body of A. pinguis is inserted 0.45µm from the cell anterior and extends 0.45 µm with a short 10° angle toward the left at the front end of the insertion, a feature not seen in R. multifida. The posterior basal body (PBB) of A. pinguis consists of a cartwheel configuration that is 0.4 µm in length and proximal ventral triplets that extend 2.0 µm to 0.53 µm from the front of the cell, while ventral triplets of R. multifida begin 1.12 µm from the front of the cell and extend for 2.74 µm to a 0.5 µm long cartwheel configuration. These data provide support for a correlation between mature gamete width and width of locomotory apparatus components. However, the fundamental construction of the locomotory apparatus is conserved within these sister taxa.
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1 - Southern Illinois University Carbondale, Plant Biology, 420 Life Science 2, Southern Illinois University , Carbondale, IL, 62901, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie B/Cliff Lodge - Level B
Date: Monday, July 27th, 2009
Time: 2:15 PM