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Wang Yan-Ping, Li Chu-Ran, Luo Yan, Li Qing-Qing, Li Lu, Wang Xiao-Yun. Preliminary study on morphology and taxonomic significance of anther cap in nine Dendrobium species (Orchidaceae) from China[J]. Plant Science Journal, 2021, 39(4): 367-378. DOI: 10.11913/PSJ.2095-0837.2021.40367
Citation: Wang Yan-Ping, Li Chu-Ran, Luo Yan, Li Qing-Qing, Li Lu, Wang Xiao-Yun. Preliminary study on morphology and taxonomic significance of anther cap in nine Dendrobium species (Orchidaceae) from China[J]. Plant Science Journal, 2021, 39(4): 367-378. DOI: 10.11913/PSJ.2095-0837.2021.40367

Preliminary study on morphology and taxonomic significance of anther cap in nine Dendrobium species (Orchidaceae) from China

  • Morphology and ultra-structure of anther cap in nine Dendrobium species from China were investigated using microscopy and scanning electron microscopy (SEM). Results showed that color, size, shape, and ultra-structure of anther cap varied from species to species. There were three kinds of anther caps:yellow, white, and purple, which were corresponding with those of sepals and petals in each species. Anther cap shapes could be classified into prolate-type and hemisphere-type based on the ratio of the polar to the equatorial axis. SEM revealed four types of ornamental decoration on the outer wall of anther cap, namely, flat-smooth, flat-striated, papillae-striated and papillae-smooth. Morphological and ultra-structural characteristics of anther cap were significantly different in the nine investigated species. Some relationships were supported by comparative anther morphology. (1) Sect. Dendrobium was both paraphyletic and polyphyletic. (2) D. thyrsiflorum Rchb., was closely related to D. densiflorum Lindl. ex Wall. (3) D. gratiosissimum Rchb. F and D. wardinaum Warner were part of the same sister group, which formed a main clade (G4,Pendulum group) with D. lituiflorum Lindl. in Sect. Dendrobium.
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