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Korean J. Pl. Taxon > Volume 25(4); 1995 > Article
Korean Journal of Plant Taxonomy 1995;25(4): 209-220.
doi: https://doi.org/10.11110/kjpt.1995.25.4.209
한국산 바위솔속 식물의 엽육조직 및 다육질성 지수와 그 유연관계 연구
김인선, 박재홍, 서봉보, 송승달
Foliar structure and mesophyll succulence in three Korean Orostachys species and its phylogenetic implications
In Sun Kim, Jae Hong Park, Bong Bo Seo, Seung Dal Song
Abstract
Foliar structure and mesophyll succulence of three Korean Orostachys species, O. japonicus A. Berger, O. malacophyllus Fisch., and O. sikokianus Ohwi, were examined to survey the presence of CAM in this group. Both features demonstrated that all of them were probably CAM performing species. The foliar structure of all three species was rather simple, exhibiting only epidermis, undifferentiated mesophyll, and vascular bundles. The mesophyll consisted of large water-storing cells, each containing a large central vacuole and chloroplasts in the thin peripheral cytoplasm. A well-developed intercellular space system was found in all species. In many cases, mucilaginous materials appeared in the intercellular spaces. In addition, attention was paid to the features of the vascular tissues. Paucity of vascular tissue was a general phenomenon. The arrangement of the vascular bundles differed for each species. The mesophyll succulence (Sm) is a possible indicator of CAM. This ranged from 4.65 to 7.38 for these species. This was well within the range of Sm reported for CAM plants. The anatomical implications of ecological adaptation, and a plausible evolutionary phylogeny are also discussed.
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