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Developmental and Structural Section

Alarid, Khalid M [1], Bray, Rebecca D [1], Musselman, Lytton John [1].

A comparative Study of Microspore Wall Morphogenesis of Isoetes (Isoetaceae, Lycophyta).

Microspore wall morphogenesis of 6 species of Isoetes has been studied using scanning and transmission electron microscopy. The microspores are monolete and 20-40μ in diameter. Each species shows a unique ornamentation. The microspore wall consists of four layers: perispore, paraexospore, exospore and endospore. Immediately after meiosis, the paraexospore is formed around the microspore. The exospore is formed next between the cell membrane and the paraexospore. Finally, the perispore is deposited on the paraexospore and the endospore is formed within the exospore. Paraexospore, exospore and endospore are derived from the cytoplasm of the microspore. The sporopollenin materials of the perispore are derived from the cytoplasm of the sporangial tapetum.


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1 - Old Dominion University, Department of Biological Sciences, Mills Godwin Building, 45th Street, Norfolk, Virginia, 23529-0266, USA

Keywords:
morphogenesis
sporopollenin,
tapetum
TEM, SEM.

Presentation Type: Oral Paper
Session: 16-8
Location: 400/Hilton
Date: Monday, August 15th, 2005
Time: 4:00 PM
Abstract ID:272


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