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Fine Structural Study of Pollen Wall Development at Late Stage of Microsporogenesis in Panax ginseng  

Jeong, Byung-Kap (Department of Biological Sciences Kosin University)
Publication Information
Applied Microscopy / v.35, no.4, 2005 , pp. 74-83 More about this Journal
Abstract
The ontogeny of pollen wall in Panax ginseng was studied with transmission and scanning electron microscopy from early tetrad stage until pollen maturity. Initial indication of exine development is undulation of plasma membrane for the preparation of bacular mound. The first recognizable structure of the pollen wall is the cellulosic primexine which is formed outside of the plasma membrane while microspore tetrads are still surrounded by callose wall. As development proceeds, foot-layer and baculum differentiation, callose dissolution and exine formation were progressed. During this process, sporopollenin is deposited into the exine, and then endexine development was followed. The intine, innermost pollen wall layer, is developing form hypertrophic Golgi vesicles. The thickness of exine is very even on all along the pollen wall, but intine thickness of apertural region is thicker than that of nonapertural region. Mature pollen of ginseng is $20{\mu}m$ in size, tricolpate and shows fine reticulate sculpturing.
Keywords
Development; Fine structure; Ginseng; Pollen wall;
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