Developmental Ultrastructure of Glandular Trichomes of <Emphasis Type="Italic">Rosmarinus officinalis</Emphasis>: Secretory Cavity and Secretory Vesicle Formation |
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Authors: | Jang-Sun Choi Na Young Lee Seung-Eun Oh Ki-Cheol Son Eun-Soo Kim |
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Institution: | (1) Department of Biological Sciences, Konkuk University, Seoul, South Korea;(2) Department of Environmental Sciences, Konkuk University, Seoul, South Korea; |
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Abstract: | Glandular trichomes in the leaf lamina of Rosmarinus officinalis L. were examined by scanning and transmission electron microscopy. The leaves were characterized by an abundance of two types
of glandular trichomes—small capitate and large peltate glandular trichomes. In addition to the glandular trichomes, numerous
non-glandular trichomes were present on the abaxial surface of the leaf. These trichomes mainly predominated on the midrib,
whereas glandular trichomes occurred on non-vein areas. At the initial phase of secretory cavity formation, hyaline areas
were abundant in periclinal walls of head cells, while they were not observed in the anticlinal walls. The hyaline areas gradually
increased in size, fusing with other areas throughout the wall. Loose wall material adjacent to hyaline areas was released
from the head cell walls and migrated into the secretory cavities. As the secretory cavities continued to enlarge, the new
vesicles emerging into the secretory cavities from the walls of head cells became surrounded with the surface of a typical
membrane. They developed a round shape, but the contours of the vesicle surfaces appeared polygonal when tightly packed inside
a cavity. These vesicles varied in size; small vesicles often possessed electron-dense contents, while large vesicles contained
electron-light contents. |
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