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作者Lee, T.Y.;J.W. Liu;S.F. Li;H.M. Chang;I.A. Valdespino;C. Chesson;H. Oppenheimer;A. Bakutis;P. Saenger;J.W.H. Yong;S. Das;N. Salazar;B. Adjie;N. Nadkarni;M.F. Kao;C.L. Huang;P. Chesson;C.R. Sheue
出版日期2018
著作名稱Micro-glass on leaves of Selaginellaceae: a systematic study of silica bodies with taxonomic and phylogenetic implications
會議名稱7th Asian Symposium of Ferns and Lycophytes
會議地點Taipei
國際性會議Y
關鍵字conical; identification; pattern; Selaginella; silicon.
摘要Silicon, the second abundant element in the earth’s crust, is absorbed by plant roots in the form of silicic acid. The silicic acid in plants becomes highly polymerized, resulting in deposition of solid bodies or particles either within or external to cells, generally appearing as amorphous silicon dioxide (SiO2·nH2O). The morphology and patterns of silica bodies on plant leaves have been studied in various groups, including angiosperms (especially grasses) and gymnosperms. Silica bodies are found to have taxonomic value. In this study, we conduct a systematic study of silica bodies of Selaginellaceae to explore their taxonomic and phylogenetic implications, based on 76 species of Selaginella (seven subgenera) collected worldwide. Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and atomic force microscopy (AFM) were used to study morphology and composition, and to construct 3-D images. Silica bodies with various distribution patterns were found on all microphyll surfaces of most species studied except the ventral side of the dorsal microphyll, which rarely had silica bodies. Following the International Code of Phytolith Nomenclature 1.0, we recognize and name 10 types of silica body in Selaginella species: (1) papillate, (2) slightly-protruded papillate, (3) granular, (4) thin-tabular, (5) conical (the most common type), (6) reniform, (7) rondelled, (8) acicular, (9) sinuate carinate, and (10) junctional at the marginal cell wall. The characteristics of silica bodies are species specific and can be an aid for identification of this difficult and diverse genus with small sized microphylls. Moreover, the traits of silica bodies are highly associated with Selaginella phylogeny, which we determined from DNA sequences.
系統號NO000004849

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