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Abstract Detail

Bryological and Lichenological Section/ABLS

D'Artenay, Tamrya Dawn [1], Renzaglia, Karen S. [2].

Architecture of the Mature Spermatozoid of Porella platyphylla (Porellaceae).

We investigated the ultrastructure of the spermatozoid of Porella platyphylla and provide the first reconstructed of a leafy liverwort sperm cell. The spermatozoid measures 26 µm in length and coils for 1.75 gyres. It has two flagella that emerge from staggered basal bodies that are 2.63 µm apart. An anterior remnant of the lamellar strip forms a hook-shaped beak of 0.49 µm in length and 0.54 µm in width. A spline of parallel microtubules provides the structural backbone for the cell; it contains 11 microtubules at the leading edge of the cell and narrows to a shank of 4 or 5. The spermatozoid contains two mitochondria, one anterior and one posterior, situated 0.5 µm and 20.8 µm from the front of the cell, respectively. The nucleus is cylindrical, begins at the terminus of the anterior mitochondrion, and extends 16.5 µm, where it terminates at the posterior mitochondrion. The plastid overlaps the posterior mitochondrion, contains 26-30 starch grains that begin in two rows and extend in single-file to the end of the cell. It contains a sheathing band of 40 small tubules known as the Fibrillenscheide. Aside from the small dimensions, the gamete exhibits the standard architecture of liverwort spermatozoids. However, single-file starch grains are only found in members of the Jungermannidae. Because of the correlation between gamete length and genome size, we compared maximum spline widths of Jungermannidae with known genome size, but found no correlation.

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1 - Penn State Shenango, Biology, 147 Shenango Ave, Sharon, PA, 16146, USA
2 - Southern Illinois University, Plant Biology, Southern Illinois University, Life Science II, Mail Code 6509, Carbondale, IL, 62901, USA


Presentation Type: Oral Paper:Papers for Sections
Session: 70
Location: Salon 10/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 2:45 PM
Number: 70006
Abstract ID:224
Candidate for Awards:None

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