Abstract
Trichomes present on the leaf surface of catmint (Nepeta racemosa L.) were examined using both scanning and transmission electron microscopy. Three types of trichomes were observed: (a) multicellular, uniseriate, nonglandular hairs, (b) small capitate glands with two cells in the head, and (c) large, peltate glands with four secretory/head cells. Secretory cells of capitate glands exhibited typical transfer cell morphology, with an abundance of RER and Golgi bodies, indicative of secretion of mainly hydrophilic substances. Mature peltate glands exhibited a distended cuticle and large subcuticular cavity, presumably containing the essential oils. Morphologically well-developed peltate glands were observed on young leaf primordia, with development occurring earlier at the leaf apex and along the midvein than at the leaf margins or base. Four major stages in the development of the peltate gland secretory cells were identified. The first stage was marked by highly vacuolated cytoplasm and normal distribution ...
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