Pollen morphology and its evolutionary significance in Hemerocallis (Liliaceae) |
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Authors: | Zhi-Ting Xiong Singchi Chen Deyuan Hong Yibo Luo |
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Institution: | Department of Environmental Science, Wuhan University, Wuhan, Hubei 430072, People's Republic of China;Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Academia Sinica, Beijing 100093, People's Republic of China |
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Abstract: | Pollen morphology of 10 species of Hemerocallis was investigated with LM and SEM. In addition to pollen with reticulate sexine, a new verrucate sexine pattern is found in three Chinese endemic species, H. plicata, H. forrestii and H. nana . Between the two typical sexine patterns, there are transitional variants. Also, a new pollen shape, boat-shaped-elliptic, is observed exclusively in H. nana , besides-oblong shape in other species. Phylogenetically, the common reticulate sexine pattern would be more primitive than the verrucate one. The typical reticulate sexine pattern would be basic, from which transitional variants would have derived and finally led to the typical verrucate pattern. Similarly, the common boat-shaped-oblong pollen would be more primitive than the -elliptic one, from which the latter would have derived during phylogenetic development. |
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