Leaf epidermal micromorphology defining the clades in Cinnamomum (Lauraceae)
Open Access
- 4 October 2021
- journal article
- research article
- Published by Pensoft Publishers in PhytoKeys
- Vol. 182 (182), 125-148
- https://doi.org/10.3897/phytokeys.182.67289
Abstract
In this study, we sampled 48 species of Asian Cinnamomum covering the species groups that were identified in recent phylogenetic studies and conducted leaf micromorphological observations using both light microscopy (LM) and scanning electron microscopy (SEM). Synapomorphies were determined by means of mapping micromorphological characters on a phylogenetic tree. The results indicate that Cinnamomum exhibits two different types of leaf upper epidermis: Type I has smooth/non-reticulate periclinal walls whereas Type II has reticulate periclinal walls and is unusual in the family Lauraceae. We found that the two types of micromorphological characters are clade-specific, sect. Camphora s.s. possesses Type I leaf upper epidermis, and sect. Cinnamomum s.l. has Type II leaf upper epidermis. Our study also reveals that C. saxatile, a member of sect. Camphora s.l. in the traditional classification, actually has Type II leaf upper epidermis, thus reinforcing the result of a recent molecular phylogeny that has this species in a clade consisting mainly of species of sect. Cinnamomum.Keywords
Funding Information
- National Natural Science Foundation of China
This publication has 39 references indexed in Scilit:
- MAFFT Multiple Sequence Alignment Software Version 7: Improvements in Performance and UsabilityMolecular Biology and Evolution, 2013
- Are cuticular characters useful in solving generic relationships of problematic species of Lauraceae?Taxon, 2007
- Toward an Improved Classification of LauraceaeAnnals of the Missouri Botanical Garden, 1996
- The Use of Cuticular Features in the Taxonomy of the LauraceaeAnnals of the Missouri Botanical Garden, 1996
- A revision of Lauraceae in Australia (excluding Cassytha)Australian Systematic Botany, 1989
- Kleine Beiträge zur Kenntnis der Flora von ChinaÖsterreichische botanische Zeitschrift, 1936
- Decades plantarum novarum. CXXXII—CXXXVRepertorium novarum specierum regni vegetabilis, 1914
- Decades plantarum novarum. LXXV—LXXIXRepertorium novarum specierum regni vegetabilis, 1912
- New Lauraceae from the Malayan Region. IIBulletin of Miscellaneous Information (Royal Gardens, Kew), 1910
- Sassafras in China. (Sassafras Tzumu, Hemsl.)Bulletin of Miscellaneous Information (Royal Gardens, Kew), 1907