• Journal of Korean Society of Forest Science
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• v.88 no.1
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• pp.11-17
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• 1999

Morphological variations in leaves and leaf trichomes according to tree age were investigated for the identification of Quercus taxa at the different stages of development. The sizes of leaves from one-year-old seedlings of Q. serrata, Q. dentata, and Q. aliena were the smallest and increased with tree age. Blade length, blade width, petiole length, number of serration, and serration depth war also varied with tree age. Therefore, the examined taxa by the size and form of leaves were hardly identified at juvenile stages. The type, structure, and density of leaf trichomes of each species varied remarkably along with tree age. Three types of trichomes such as small stellate hairs, large stellate hairs, and long single hairs were observed on the abaxial side of leaves of Quercus taxa. In matured trees of Q. serrata both small stellate and long single hairs on leaves were observed. On the other hand large stellate hairs were found in leaves of Q. dentata. There were small stellate hairs in Q. aliens. In Q. mongolica var. crispula, no hair or small stellate hairs were occasionally found. It is possible to identify Q. serrata and Q. dentata by the characteristics of trichome even at two to three year old seedlings, while, it is difficult to tell Q. aliens and Q. mongolica var. crispula of seedlings from other taxa only by those of trichome.

• Applied Microscopy
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• v.38 no.1
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• pp.21-28
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• 2008

Carnivorous plants vary in their unique features of morphology, ultrastructure and biochemical properties by species. Furthermore, prey-capturing mechanism as well as structural and physiological adaptations have been used for grouping various carnivorous species. In Drosera plants, glandular trichomes, which develop in the leaf epidermis, are known to play the most important role during the prey capturing process. The present study examined such trichomes, focusing on the glandular type, in leaves of Drosera anglica using scanning and transmission electron microscopy. Three types of rudimentary glandular trichomes were found to develop within the folded leaf primordia and immature leaf during early development. The first type, stalked glandular trichomes (Type I), occurred on the margin and upper epidermis of the leaf. With maturation, the longest glandular trichomes having lengthy stalks, ca. $2.2{\sim}5.1\;mm$, developed along the margin, while shorter stalked trichomes, ca. up to $200\;{\mu}m$, were found on the inner leaf blade. The shorter ones consisted of a globose head having two layers of secretory cells, parenchyma bell cells and tracheids and a multicellular stalk. The stalks gradually decreased in length in centripetal fashion. The second type, Type II, having ca. $15{\sim}30\;{\mu}m$ short stalks, also developed along the inner blade. Both types secreted mucilage from the secretory cells which had a thin cell wall and cuticle layer. The sessile six-celled glandular trichomes were the third type, Type III, and were $25{\sim}40\;{\mu}m$ in length. They were distributed most commonly throughout the upper and lower epidermis, petiole and even on the stalk surfaces of the first two types of trichomes. The third type was also found to be involved in the active secretion. In prey capturing leaves, all trichome types secreted substances through thin cuticles in the head cell wall, which exhibited relatively loose wall components.