Pollen morphology in Saxifraga(Saxifragaceae) from Ny-Alesund, Svalbard, Arctic, and its taxonomic significance  

作　　者：YAO Yifeng Bera Subir Ferguson David Kay LI Chengsen 

机构地区：[1]State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences [2]Department of Botany, University of Calcutta [3]Department of Paleontology, University of Vienna

出　　处：《Advances in Polar Science》2014年第2期105-112,共8页极地科学进展（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant no.41271222);Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences(Grant no.KSCX2-EW-J-1);Projects of the CAA,SOA(Grant nos.2012YR06006 and13/14YR05);SKLSEB-IBCAS(Grant no.56176G1048);Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(Grant no.90004F1005);Visiting Scholarship funded by the China Scholarship Council(Grant no.201204910043)

摘　　要：Pollen morphology of eight species of Saxifraga, i.e.S, cespitosa, S. oppositifolia, S. cernua, S. nivalis, S. aizoides, S. rivularis, S. hieraciifolia, and S. hirculus, collected from Ny-Alesund, Svalbard, Arctic was examined using light and scanning electron microscopy. Pollen grains of Saxifraga species are subprolate or prolate, 3-colpate, 15.4-44.4 μm in the polar axis, 11.4 34.6 μm in the equatorial axis, and show a P/E ratio 1.19-1.40. On the basis of exine ornamentation, four pollen types, viz., the S. oppositifolia type （striate without scabrae on the muff）, S. cernua type （striate with scabrae on the muri）, S. nivalis type （microreticulate and operculum absent）, and S. cespitosa type （microechinate and operculum present）, were recognized. Hierarchical cluster analysis of the pollen morphological characters indicated that pollen morphology supports the infrageneric classification of the genus Saxifraga.Pollen morphology of eight species of Saxifraga, i.e.S, cespitosa, S. oppositifolia, S. cernua, S. nivalis, S. aizoides, S. rivularis, S. hieraciifolia, and S. hirculus, collected from Ny-Alesund, Svalbard, Arctic was examined using light and scanning electron microscopy. Pollen grains of Saxifraga species are subprolate or prolate, 3-colpate, 15.4-44.4 μm in the polar axis, 11.4 34.6 μm in the equatorial axis, and show a P/E ratio 1.19-1.40. On the basis of exine ornamentation, four pollen types, viz., the S. oppositifolia type （striate without scabrae on the muff）, S. cernua type （striate with scabrae on the muri）, S. nivalis type （microreticulate and operculum absent）, and S. cespitosa type （microechinate and operculum present）, were recognized. Hierarchical cluster analysis of the pollen morphological characters indicated that pollen morphology supports the infrageneric classification of the genus Saxifraga.

关 键 词：ARCTIC Ny-Alesund pollen morphology SAXIFRAGA SVALBARD 

分 类 号：Q949[生物学—植物学]