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《Acta Phytotaxonomica Sinica》 2001-01
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Pollen morphology of Najadaceae and Zannichelliaceae

SUN Kun 2 CHEN Jia Kuan 3 ZHANG Zhi Yun 1(Institute of Botany, Northwest Normal University,Lanzhou 730070) 2(Institute of Biodiversity Sciences, Fudan University, Shanghai 200433) 3(Laboratory of Systematic and Evolutionary Botany, Institute  
WT5BZ]In the aquatic order Najadales, severe structural reduction, particularly the floral structure reduction, and strong convergence of morphological characters occurring in the Najadaceae and Zannichelliaceae have greatly obscured their phylogenetic relationships and presented systematists with difficult problems in understanding their phylogenetics. To gather more basic phylogenetic information regarding Najadaceae and Zannichelliaceae, pollen morphology of 4 genera of these two families was examined with light microscope (LM), scanning electron microscope (SEM) and transmission electron microscope (TEM). Our results provide the following insights: (1) Pollen grains of Zannichelliaceae are inaperturate, subspheroidal or subprolate, with ornate or reticulate exine sculpturing. Pollen grains of Vleisia and Zannichellia are smaller, usually with ornate sculpturing, while those of Lepilaena are larger, with crispate, ornate or reticulate sculpturing. (2) Pollen grains of some species, e.g. Najas oguraensis Miki and N. flexilis (Willd.)Rostk. et Schmidt. in Najadaceae, are monosulcate, but in some other species studied here they are inaperturate. Pollen grains of this family usually have not exine sculpturing, but those of N. oguraensis Miki and N. flexilis (Willd.)Rostk et Schmidt have verrucate or granular sculpturing. (3) Evidence from the aperture, wall sculpturing and structure of pollen grains does not support the viewpoint that Najadaceae is closely related to Zannichelliaceae and Potamogetonaceae, but shows that Zannichelliaceae and Potamogetonaceae are near relatives.
【Fund】: 国家自然科学基金!(No.3980 0 0 0 8;39630 0 30 );; 西北师范大学科研创新基金;; 中国科学院植物研究所系统与进化植物学开放研究实验室
【CateGory Index】: Q949.2
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